Descriptors for wild and cultivated Rice (Oryza spp.)

2007

Descriptors for wild and cultivated rice (Oryza spp.)' is a revision of the original IBPGR and IRRI publication 'Descriptors for rice (Oryza sativa L.)' (1980), expanded to include descriptors for wild rice species of the genus Oryza, and harmonized as far as possible with descriptors developed by the International Union for the Protection of New Varieties of Plants (UPOV 2004; www.upov.org) for new cultivars of cultivated rice.

Crop
Rice
Publisher
Bioversity International
Bibliographic citation

Bioversity International, IRRI and WARDA. 2007. Descriptors for wild and cultivated rice (Oryza spp.). Bioversity International, Rome, Italy; International Rice Research Institute, Los Baños, Philippines; WARDA, Africa Rice Center, Cotonou, Benin.

Version
2007

The rank of the subtaxon name. The following abbreviations are allowed: ‘subsp.’ (for subspecies); ‘convar.’ (for convariety); ‘var.’ (for botanical variety); ‘f.’ (for form).

Classification
Passport descriptor
Data type
Free text

The infraspecific epithet of the scientific name (i.e. the epithet following the indication of the infraspecific rank in the name string).

Classification
Passport descriptor
Data type
Free text

Asian cultivated rice (Oryza sativa) only. Stage: flowering to maturity. O. sativa is classified into two major cultivar groups, indica and japonica, based traditionally on morphological and grain characteristics. Other groups have also been recognized but since the variation in morphological features among cultivars is continuous, it is often difficult to make an accurate classification. Isozyme data and molecular data are generating new insights but are not entirely consistent with the morphological classifications (Glaszmann 1987); for example, it is quite common for accessions to be classified as indica by morphology but japonica by isozymes. Both systems are therefore provided here, although this may need to be revised as new information is obtained. The traditional morphological classification recognizes four major groups.

Classification
Passport descriptor
Data type
Coded
CodeTermDescription
1Indica
2Temperate japonicaJaponica, sinica
3Tropical japonicaJavanica
4IntermediatesHybrids

Asian cultivated rice (Oryza sativa) only. From Glaszmann (1987).

Classification
Passport descriptor
Data type
Coded
CodeTermDescription
1Group IIndica
2Group IIAus group
3Group IIIDeepwater rice a
4Group IVDeepwater rice b
5Group VBasmati group
6Group VIJaponica, temperate and tropical
7Intermediates

Include here any previous identification other than the current name. Collecting number or newly assigned station names are frequently used as identifiers.

Classification
Passport descriptor
Data type
Free text

This field is used to add notes or to elaborate on descriptors with value ‘99’ or ‘999’ (= Other).

Classification
Passport descriptor
Data type
Free text

Name of the primary administrative subdivision of the country in which the sample was collected.

Classification
Passport descriptor
Data type
Free text

Name of the secondary administrative subdivision (within a province/state) of the country in which the sample was collected.

Classification
Passport descriptor
Data type
Free text
Classification
Passport descriptor
Data type
Coded
CodeTermDescription
10Wild habitat
11Forest/woodland
12Shrubland
13Grassland
14Desert/tundra
20Farm
21Field
22Orchard
23Garden
24Fallow
25Pasture
26Store
30Market
31Town
32Village
33Urban areaAround city
34Other exchange system
40Institute/research organization
99OtherSpecify in descriptor 2.19, Collector’s notes

Type of sample collected. If different types of material were collected from the same source, each sample type should be designated with a unique collecting number and a corresponding unique accession number.

Classification
Passport descriptor
Data type
Coded
CodeTermDescription
1Seed
2Panicles
3Vegetative sample

Name of the ethnic group of the donor of the sample or of the people living in the area of collecting.

Classification
Passport descriptor
Data type
Free text

Name given by farmer to crop, cultivar, landrace, clone or wild form. Use Unicode text to specify the name using the standard script of the local language. This serves as the definitive version of the name.

Classification
Passport descriptor
Data type
Free text

Specify local language and/or dialect of the name.

Classification
Passport descriptor
Data type
Free text

The preferred anglicized ASCII equivalent of the name in "Local vernacular name (local script, Unicode text)" (Note: in some of the richer scripts, more than one distinct name in "Local vernacular name (local script, Unicode text)" can be transliterated to the same ASCII text. Therefore, the anglicized form must not be treated as a unique name.)

Classification
Passport descriptor
Data type
Free text

If the name in "Local vernacular name (local script, Unicode text)" can be transliterated in more than one way, provide all commonly used transliterated variants of the form given in "Preferred transliterated local vernacular name (Roman script)", separated by semicolons. For example, if "Local vernacular name (local script, Unicode text)" is ‘ໄກ່ນ້ອຍ’, "Preferred transliterated local vernacular name (Roman script)" is ‘Kai Noi’ and "Alternative transliterated local vernacular names (Roman script)" would be ‘Kay Noi;Kay Noy;Kay Noy;KayNoi; KayNoy;KaiNoi;KayNoy’.

Classification
Passport descriptor
Data type
Free text

Provide a literal translation or an interpretation of the local vernacular name.

Classification
Passport descriptor
Data type
Free text
Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.
Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.
Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.
Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Describe briefly particular characteristics of the rice cultivar (e.g. popularity).

Classification
Passport descriptor
Data type
Free text

Describe farmers’ perceptions on hardiness of the cultivar in relation to main stresses.

Classification
Passport descriptor
Data type
Free text

Information on main associated biotic (pests and diseases) and abiotic (drought) stresses.

Classification
Passport descriptor
Data type
Free text
Classification
Passport descriptor
Data type
Date
Classification
Passport descriptor
Data type
Date

Was a herbarium specimen collected? If so, provide an identification number and indicate in which place (herbarium) the rice specimen was deposited, in descriptor 2.19, Collector’s notes.

Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Visual assessment of plants per hectare

Classification
Passport descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Additional information recorded by the collector or any specific information on any state in any of the above descriptors.

Classification
Passport descriptor
Data type
Free text

State building, room, medium- and/or long-term storage.

Classification
Management descriptor
Data type
Free text
Classification
Management descriptor
Data type
Date
Classification
Management descriptor
Data type
Numeric
Unit of measure
%
Classification
Management descriptor
Data type
Date
Classification
Management descriptor
Data type
Numeric
Unit of measure
%

Approximate amount of seeds of an accession in the genebank.

Classification
Management descriptor
Data type
Numeric
Unit of measure
g
Classification
Management descriptor
Data type
Free text
Classification
Management descriptor
Data type
Free text
Classification
Management descriptor
Data type
Free text
Classification
Management descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.
Classification
Management descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.
Classification
Management descriptor
Data type
Free text

(See instructions in descriptor 2.4, Country of origin).

Classification
Environment and Site descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

(See format under 2.8)

Classification
Environment and Site descriptor
Data type
Numeric

(See format under 2.9)

Classification
Environment and Site descriptor
Data type
Numeric
Classification
Environment and Site descriptor
Data type
Numeric
Unit of measure
m
Classification
Environment and Site descriptor
Data type
Date

Environment in which characterization/evaluation was carried out

Classification
Environment and Site descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Environment in which characterization/evaluation was carried out

Classification
Environment and Site descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Give block, strip and/or row plot numbers as applicable.

Classification
Environment and Site descriptor
Data type
Free text
Classification
Environment and Site descriptor
Data type
Numeric
Unit of measure
cm
Classification
Environment and Site descriptor
Data type
Numeric
Unit of measure
cm

Use descriptors 6.1.1 to 6.1.12 in section 6.

Classification
Environment and Site descriptor
Data type
Free text
Classification
Environment and Site descriptor
Data type
Free text
Classification
Environment and Site descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Description of the geomorphology of the immediate surroundings of the site (adapted from FAO 1990). (See Fig. 1)

Classification
Environment and Site descriptor
Data type
Coded
CodeTermDescription
N/ACoding table was not provided.

Estimated slope of the site

Classification
Environment and Site descriptor
Data type
Numeric
Unit of measure
º
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Homogenous
2HeterogeneousSpecify in descriptor 7.6, Notes

Date when seeds were first moistened; this is the date of soaking for pre-soaked seed, or the date of sowing for dry seed sown onto a wet seedbed, or the date when rain or other moisture becomes available to seed sown dry on a dry seedbed.

Classification
Characterization descriptor
Data type
Free text

(Wild species). Date on which the first flush of flowers is observed. It is specified either as the number of days from effective seeding date to first heading date (7.2.2.1) or as the date of effective seeding and date of first heading (7.2.1 and 7.2.2.2).

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
7.2.2.1Number of days from effective seeding to first heading [d]
7.2.2.2First heading date [YYYYMMDD]

Date on which 80% of the plants are heading. It is specified either as the number of days from effective seeding date to main heading date (7.2.3.1) or as effective seeding date and main heading date (7.2.1 and 7.2.3.2).

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
7.2.3.1Number of days from effective seeding to main heading date [d]
7.2.3.2Main heading date [YYYYMMDD]

Maturity is the date on which 80% of the grains on the panicles are fully ripened.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
7.2.4.1Number of days from effective seeding to maturity [d]
7.2.4.2Maturity date [YYYYMMDD]

(Wild species). The completeness of plant growth in a growing season. Stage: after ratooning.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Annual
2Perennial
3Intermediate

Observed in 6–7-day-old seedlings

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
Absent
1
Very weak
3
Weak
5
Medium
7
Strong

Measured from the base of the shoot to the tip of the tallest leaf blade, to nearest cm. Average of 10 seedlings. Stage: 5-leaf stage, approximately 20 DAS2. Alternatively, Oryza sativa can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Short <30 cm
5
Intermediate ~45 cm
7
Tall >60 cm

Colour of the outer surface of the leaf sheath. Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1060 Green
2084 Green with purple lines
3081 Light purple
4080 Purple

Presence and intensity of anthocyanin colouration on the outer surface of the sheath on the penultimate leaf. Stage: late vegetative

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
Absent
3
Weak
5
Medium
7
Strong

Stage: late vegetative

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present

Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1086 On tips only
2085 On margins only
3089 In blotches
4080 EvenUniform purple

Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
No green colour visible due to anthocyanin
3
061 Light
5
060 Medium Green
7
063 Dark

(Cultivated species). Position of the tip of the blade relative to its base, scored on the leaf below the flag leaf. Stage: late vegetative prior to heading

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Erect
5
Horizontal
7
Drooping

Assess both visually and by touch, rubbing fingers over the leaf surface from the tip downwards. Stage: late vegetative.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1GlabrousSmooth—including ciliated margins
2Intermediate
3Pubescent

(Wild species). Specify location of hairs present on the surface of the blade. Stage: late vegetative

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1GlabrousNo hairs
2Hairy on upper surface
3Hairy on lower surface
4Hairy on both sides

(Wild species). Assess pubescence of leaf margins. Stage: late vegetative

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1GlabrousNo hairs
2Hairy or ciliated

Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0AbsentNo auricles
1011 Whitish
2062 Yellowish green
3080 Purple
4081 Light purple
5084 Purple lines

Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0AbsentCollarless
1060 Green
2061 Light green
3080 Purple
4084 Purple lines

Measured on five samples from base of collar to the tip of the ligule of the penultimate leaf, i.e. the leaf below the flag leaf. Stage: after anthesis

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

Different scoring systems are used for cultivated and wild species

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
7.3.14.1Ligule shapeCultivated species
7.3.14.2Ligule shapeWild species

Stage: late vegetative. See Fig. 2.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Truncate
2Acute to acuminate
32-cleft

Stage: late vegetative. See Fig. 3

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Fringe of hairs
2Truncate
3Obtuse or rounded
4Emarginate
5Acute
6Acuminate
72-cleft

Stage: after anthesis.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Entire
2Scalloped or toothed
99OtherSpecify in descriptor 7.6, Notes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present

(Wild species). Visual assessment using hand lens. Stage: after anthesis

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Glabrous
2Partially hirsute: hairs covering less than 50% of the ligule
3Mostly or generally hirsute: hairs covering more than 50% of the ligule

Stage: late vegetative (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0AbsentLiguleless
1011 Whitish
2062 Yellowish green
3080 Purple
4081 Light purple
5084 Purple lines

Measure the penultimate leaf (i.e. highest leaf below the flag leaf) on the main culm, from the ligule to the tip of the blade, on five representative plants. Calculate average to nearest cm. Cultivated species: measure at early reproductive stage. Wild species: measure 7 days after anthesis. Alternatively, Oryza sativa can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very short (<21 cm)
3
Short (~30 cm)
5
Intermediate (~50 cm)
7
Long ~70 cm
9
Very long >80 cm

Measure at the widest portion of the penultimate leaf (i.e. highest leaf below the flag leaf) on the main culm on five representative plants. Calculate average to nearest cm. Cultivated species: measure at early reproductive stage. Wild species: measure 7 days after anthesis. Alternatively, Oryza sativa can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Narrow <1 cm
5
Intermediate
7
Broad >2 cm

Measure length of the flag leaf, from the ligule to the tip of the blade, on five representative plants. Calculate average to nearest cm. Stage: 7 days after anthesis

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Measure width at the widest portion of the flag leaf on five representative plants. Calculate average to nearest cm. Stage: 7 days after anthesis

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Measured near the collar. Angle of attachment between the flag leaf blade and the main panicle axis. Record the average of five samples. See Fig. 5. Cultivated species: score at anthesis. Wild species: score 7 days after anthesis

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Erect
3
Semi-erect Intermediate
5
Horizontal
7
Descending

The estimated average angle of inclination of the base of the main culm from vertical. Stage: after flowering. See Fig. 4.

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Erect <15°
3
Semi-erect Intermediate) (~20°
5
Open ~40°
7
Spreading >60–80°, culms not resting on the ground
9
Procumbent Culm or its lower part rests on ground surface

Prostrate cultivars only (i.e. with Culm habit = 9). Measured after flowering in conditions where culms have fallen flat due to receding water flow. The stems of cultivars with kneeing ability start to grow upright with 3 to 4 nodes and bear panicles.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present

Measured from ground level to the base of the panicle. Record the average of five actual measurements, to the nearest cm. Stage: cultivated species after flowering to maturity; wild species 7 days after anthesis. See Fig. 6. Alternatively, cultivated species can be coded as follows:

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Very short<50 cm
2Very short to short51–70 cm
3Short71–90 cm
4Short to intermediate91–105 cm
5Intermediate106–120 cm
6Intermediate to long121–140 cm
7Long141–155 cm
8Long to very long156–180 cm
9Very long>180 cm

Recorded as the total number of grain-bearing and non-bearing tillers on five plants (see descriptor 5.6, Field spacing). Stage: after anthesis to near maturity. Can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Low <10 culms
5
Intermediate ~15 culms
7
High >20 culms

Measured as the outer diameter of basal portion of the main culm. Cultivated species: record average of three representative plants during flowering or at late reproductive stage. Wild species: record average of five plants at late reproductive stage. Alternatively, cultivated species can be coded as follows:

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Thin<5 mm
2Thick≥5 mm

The presence and distribution of purple colour from anthocyanin, observed on the outer surface of the nodes on the culm. Stage: after flowering to near maturity (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1080 Purple
2081 Light purple
3084 Purple lines

The underlying colour of the outer surface of the nodes on the culm, ignoring any anthocyanin colouration. Stage: after flowering to near maturity (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No underlying colour visible due to anthocyanin
1041 Light gold
2060 Green

The presence and distribution of purple colour from anthocyanin, observed on the outer surface of the internodes on the culm. Stage: near colouration maturity (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1080 Purple
2084 Purple lines

The underlying colour of the outer surface of the internodes on the culm, ignoring any anthocyanin colouration. Stage: near maturity (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No underlying colour visible due to anthocyanin
1041 Light gold
2060 Green

Scored at maturity based on the observed degree of lodging.

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very weak All plants flat
3
Weak Most plants nearly flat
5
Intermediate Most plants leaning about 45°
7
Strong (most plants leaning about 20° from vertical)
9
Very strong All plants vertical

Assessed by gently pushing the tillers back and forth at a distance of about 30 cm from the ground. This test gives some indication of stiffness and resilience. Stage: at harvest

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very weak
3
Weak
5
Intermediate
7
Strong
9
Very strong

(Cultivated species). Observed near the collar. Angle of attachment between the flag leaf blade and the main panicle axis. Record the average of five samples. Stage: maturity

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Erect
3
Semi-erect
5
Horizontal
7
Descending

Estimated by observing all leaves below the flag leaf for their retention of greenness. Stage: at harvest

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very early All leaves lost their green colour before grain maturity
3
Early (all leaves have lost their green colour at harvest)
5
Intermediate One leaf still green at harvest
7
Late Two or more leaves still green at harvest
9
Very late All leaves still green at harvest

(Wild species). Observe when plants are ready for harvest

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Vegetative crown
2Vegetative crown and stolon
3Vegetative crown and weak rhizomes
4Vegetative crown, stolon and weak rhizomes
5Strong rhizomes and no tubers
6Strong rhizomes with tubers

Stage: at anthesis.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Effectively absent: <25% sterile pollen
2Intermediate
3Male sterile: >95% sterile pollen

Observed at anthesis (between 0900 and 1400) using a hand lens (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2061 Light green
3030 Yellow
4081 Light purple
5080 Purple

(Wild species). Record the average of five samples. Stage: at anthesis

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

(Wild species). Stage: at anthesis (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1030 Yellow
2050 Brown

Stage: after anthesis to hard dough stage (pre-ripening stage) (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2012 Green-stripped white
3042 Gold and gold furrows
4052 BrownTawny
5053 Brown spots on green
6054 Brown furrows on green
7056 Blackish brown
8060 Green
9062 Yellowish green
10080 Purple
11082 Reddish to light purple
12083 Purple shade
13090 Purple spots on green
14091 Purple furrows on green
15100 Black

Stage: cultivated species after anthesis to hard dough stage (pre-ripening stage); wild species at anthesis (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2020 Straw
3052 Brown (tawny)
4060 Green
5070 Red
6071 Red apex
7080 Purple
8087 Purple apex
9100 Black

Stage: after anthesis to hard dough stage (pre-ripening stage)

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
Absent
1
Very weak
3
Weak
5
Medium
7
Strong

Stage: flowering to maturity

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Partly awned
2Fully awned

The presence and distribution of awns along the panicle. Stage: flowering to maturity

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0NoneAwnless
1Tip only
2Upper quarter only
3Upper half only
4Upper three-quarters only
5Whole length

Stage: after anthesis (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0AbsentAwnless
1011 Whitish
2020 Straw
3040 Gold
4052 Brown (tawny)
5061 Light green
6070 Red
7080 Purple
8100 Black

Record the average length of 10 representative spikelets. Cultivated species: measure the longest awn. Stage: maturity Wild species: measure random awns. Stage: after anthesis Alternatively, cultivated species can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
None Awnless
1
Very short <5 mm
3
Short ~8 mm
5
Intermediate ~15 mm
7
Long ~30 mm
9
Very long >40 mm

(Wild species). Record the average width of 10 representative spikelets, at 1 cm from the apiculus of the spikelet. Stage: after anthesis

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

(Wild species). Stage: after anthesis

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Whorled
2Alternate

Recorded from 5 panicles on wild species only. The number of primary panicle branches attached to the basal whorl of the panicle. Stage: after anthesis

Classification
Characterization descriptor
Data type
Numeric

(Wild species). Record the average of five representative panicles when fully exserted.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

(Wild species). Assess by rubbing fingers from the base towards the tip of the panicle axis. Stage: at full panicle exsertion

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Scabrous
2Smooth

Record the number of panicles per plant (see descriptor 5.6, Field spacing). Stage: early ripening Alternatively, panicle number can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Low
5
Intermediate
7
High

(Wild species). Length of main axis of panicle measured from the panicle base to the tip. Record the average of five representative plants. Stage: 7 days after anthesis or upon full panicle exsertion

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Stage: near maturity

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Upright
2Semi-upright
3Slightly drooping
4Strongly drooping

The compactness of the panicle, classified according to its mode of branching, angle of primary branches, and spikelet density. See Fig. 7. Stage: cultivated species, near maturity; wild species, 7 days after anthesis

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Erect Compact panicle
3
Semi-erect Semi-compact panicle
5
Spreading (open panicle)
7
Horizontal
9
Drooping

The abundance and distribution of spikelets borne on secondary branches of the panicle. Stage: near maturity. See Fig. 8.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Sparse~1 secondary branch per primary branch. Most spikelets borne directly on primary branches
2Dense~2-3 secondary branches per primary branch. ~50% of spikelets borne directly on primary branches
3Clustered~3-4 secondary branches per primary branch. All spikelets on secondary branches, giving a clustered appearance

Extent to which the panicle is exserted above the flag leaf sheath. Stage: near maturity. See Fig. 9.

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Enclosed Panicle is partly or entirely enclosed within the leaf sheath of the flag leaf blade
3
Partly exserted Panicle base is slightly beneath the collar of the flag leaf blade
5
Just exserted Panicle base coincides with the collar of the flag leaf blade
7
Moderately well exserted Panicle base is above the collar of the flag leaf blade
9
Well exserted Panicle base appears well above the collar of the flag leaf blade

Observed as the extent to which grains have shattered from the panicle. Stage: at maturity or harvest

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very low <1%
3
Low ~3%
5
Moderate ~15%
7
High ~35%
9
Very high >50%

(Cultivated species). Length of main axis of panicle measured from base to the tip. Record the average of five representative plants. Alternatively, lengths can be coded as follows:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

1
Very short <11 cm
3
Short ~15 cm
5
Medium ~25 cm
7
Long ~35 cm
9
Very long >40 cm

(Cultivated species). Determined by grasping the panicle with the hand, applying a slight rolling pressure with the palm and fingers, and assessing the percentage of grains that are removed by the action.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1DifficultFew or no grains removed
2Intermediate25–50% of grains removed
3Easy>50% of grains removed
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0AbsentAwnless
1020 Straw
2040 Gold
3052 Brown (tawny)
4070 Red
5080 Purple
6100 Black

Visual assessment of the presence and distribution of mature grains using hand lens.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Glabrous
2Hairs on lemma keel
3Hairs on upper portion
4Short hairs
5Long hairsVelvety
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2020 Straw
3042 Gold and gold furrows
4052 BrownTawny
5053 Brown spots
6054 Brown furrows
7080 Purple
8082 Reddish to light purple
9090 Purple spots
10091 Purple furrows
11100 Black
Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
Absent
1
Very weak
3
Weak
5
Medium
7
Strong
Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

0
Absent
1
Very weak
3
Weak
5
Medium
7
Strong
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2020 Straw
3052 Brown (tawny)
4060 Green
5070 Red
6071 Red apex
7080 Purple
8087 Purple apex
9100 Black

(Cultivated species). Stage: after harvest

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Pointed
2Curved

Record the average length of five spikelets. For spikelets with symmetrical sterile lemmas (i.e. sterile length the same on both sides), record the length here. For spikelets with asymmetrical sterile lemmas (i.e. sterile lemma on one side longer than that on the other), record here only the length of the shorter sterile lemma (see 7.5.11 for the longer sterile lemma). May be coded as:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Short
5
Medium
7
Long
9
Extra long

(Only for spikelets with asymmetrical sterile lemmas). Record the average length of the longer sterile lemma on five spikelets. May be coded as:

Classification
Characterization descriptor
Data type
Scale
0
1
2
3
4
5
6
7
8
9

Legend:

3
Short
5
Medium
7
Long
9
Extra long

(Wild species).

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1LinearLong and slender
2Subulate or setaceousLinear and tapering to a fine point, set with or consisting of bristles
3TriangularAnd very small

Observe five representative plants. (IRRI)

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1020 Straw
2040 Gold
3070 Red
4080 Purple

The abundance of well-developed spikelets as a percentage of the total number of spikelets on five representative panicles. May be coded as:

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Completely sterile (0%)
2Highly sterile1–49%
3Partly sterile50–74%
4Fertile75–90%
5Highly fertile>90%

Measured as the distance from the base of the lowermost glume to the tip (apiculus) of the fertile lemma or palea, whichever is longer. On awned cultivars, measure to a point comparable to the tip of the apiculus (exclude the awn). Preferably, measure with calliper or photo-enlarger. Average of 10 representative grains.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

Measured as the distance across the fertile lemma and palea at the widest point. Preferably, measure with calliper or photo-enlarger. Average of 10 representative grains.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

(Wild species). Preferably, measure with a calliper or photo-enlarger. Average of 10 representative grains. Stage: after harvest

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm

(Cultivated species). Random sample of 100 well-developed, whole grains, dried to 13% moisture content. Weigh on a precision balance.

Classification
Characterization descriptor
Data type
Free text

(Wild species). (10-grain samples are taken because of the low seed production of wild rice.) Random sample of 10 well-developed, whole grains, dried to 13% moisture content. Weigh on a precision balance. Stage: post-harvest

Classification
Characterization descriptor
Data type
Free text
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Round
2Semi-round
3Half spindle-shaped
4Spindle-shaped
5Long spindle-shaped
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1010 White
2051 Light brown
3055 Speckled brown
4050 Brown
5070 Red
6088 Variable purple
7080 Purple

By visual observation, two types of endosperm of polished rice are distinguishable. In glutinous rice, which does not have amylose, the endosperm appears a waxy white. In non-glutinous rice, which contains amylose, the endosperm appears cloudy and translucent.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Non-glutinousNon-waxy
2Intermediate
3GlutinousWaxy
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