Descriptor list details

IITA descriptors for yam

1.0

Yam collection characterization

Crop
Yam
Publisher
Not specified
Version
1.0

Assessed at 20 days after emergence

Classification
Characterization descriptor
Data type
Numeric

Assessed at 20 days after emergence

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Green
2Green with purple edges
3Purple
99Other

Assessed at 30 days after emergence

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Yellowish
2Pale green
3Dark green
4Purplish green
5Purple
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Green
2Purple
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Yellowish
2Green
3Pale purple
4purple
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1All green with purple base
2All green with purple leaf junction
3All green with purple at both ends
4All purplish green with purple base
5All purplish green with purple leaf junction
6All purplish green with purple at both ends
7Green
8Purple
9Brownish green
10Brown
11Dark brown
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Green
2Green with purple edges
3Purple
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present

In relation to tuber size

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Small
5Intermediate
7Large
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Lower
2Middle
3Upper
4Entire tuber
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Few
7
Many

beneath the bark

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Light maroon
2Dark maroon
3Greyish
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1White
2Yellowish white or off-white
3Yellow
4Orange
5Light purple
6Purple
7Purple with white
8White with purple
9Outer purple / inner yellowish
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1White
2Yellowish white or off-white
3Yellow
4Orange
5Light purple
6Purple
7Purple with white
8White with purple
9Outer purple / inner yellowish
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Smooth
2Grainy
3Very grainy

Min

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1<1 min
21-2 min
3>2 min
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Grey
2Purple
3Orange
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1White
2Yellowish white or off-white
3Yellow
4Orange
5Light purple
6Purple
7Purple with white
8White with purple
9Outer purple / inner yellowish
99Other

from cortex to centre

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Alternate
2Opposite
3Alternate at base / opposite above
4Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Obtuse
2Acute
3Emarginate
99Other
Classification
Characterization descriptor
Data type
Scale
1
2
3
4
5
6
7
8
9

Legend:

1
No measurable distance
5
Intermediate
9
Very distance
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Weak
7
Strong
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Purplish
2White
3Yellowish
99Other
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Few
7
Many
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Few
7
Many
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Numeric

Assessed at 20 days after emergence

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Green
2Purplish green
3Brownish green
4Dark brown
5Purple
99Other
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Annualtuber renewed every year
2Perennialtuber increasing in size every year
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
mm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm
Classification
Characterization descriptor
Data type
Numeric
Unit of measure
kg
Classification
Characterization descriptor
Data type
Numeric
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Completely separate and distant
2Completely separate but close together
3Fused at neck
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Sparse
7Dense
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Round
2Oval
3Oval-oblong
4Cylindrical
5Flattened
6Irregular
99Others
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Slightly branched
5
Branched
7
Highly branched
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Upper third
2Middle
3Lower third
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Few
7many
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Few
7many
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0Absent
1Present
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1<1 mm
2≥1 mm
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Few
7Many
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
3Sparse
7Dense
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No flowering
1Flowering in some years
2Every year
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Female
2Male
3Female and malepredominantly female
4Male and femalepredominantly male

In relation to branches

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Pointing upwards
2Pointing downwards
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1≤10
211 - 29
3≥30
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
0No
1Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Spike
2Raceme
3Panicle
99OtherSpecify
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Dwarf
2Shrub-like
3Climbing
Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Low
5
Intermediate
7
High
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1No
2Yes
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Clockwise (climbing to the left )climbing to the left
2Anticlockwise (Climbing to the right )Climbing to the right
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Straight
2Curved upwards
3Curved downwards

Mean of 20 spines located approximately between the first 0.5 to 1.5 m stem length

Classification
Characterization descriptor
Data type
Scale
3
4
5
6
7

Legend:

3
Short
5
Intermediate
7
Long
Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Red
2Purple
3Maroon
99Other

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