Descriptor list details

Kenya genebank characterization descriptors for maize

1.0

Characterization descriptors for maize used at the Genetic Resources Research Institute (GeRRI) - Kenya. These descriptors are based on IBPGR descriptors for maize (1991).

Crop
Maize
Publisher
Genetic Resources Research Institute
Version
1.0

Visual measurement recorded three weeks after emergence of the seedling.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Very strong
2Strong
3Average
4Weak
5Very weak

Number of days from planting to when 50% of the plants have extended silk.

Classification
Characterization descriptor
Data type
Numeric

Midrib colour of the third leaf counted from flag leaf downwards taken during or shortly after flowering.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
WWhite
DDull Green
YYellow
BBrown
GGreen
PPurple

Mean height of 10 random plants, measured from the ground level to the tip of the head taken after flowering and before ripening.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Mean height of 10 random plant ears from the ground level to the node bearing the upper ear.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Absence or prescence of pigments on leaf and stalk taken at seed filling stage.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
PPigment
TTan

Average number of basal tillers (without counting the stem)at maturity of 10 randomly selected plants.

Classification
Characterization descriptor
Data type
Numeric

Susceptibility to lodging. Scored before harvesting in a scale similar to percentages.

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

Legend:

1
Very few lodged
5
Almost 50% lodged
9
Nearly all lodged

Number of days from sowing to 90% of plants reaching physiological maturity.

Classification
Characterization descriptor
Data type
Numeric

Average of 10 randomly selected plants from the middle of the plot.

Classification
Characterization descriptor
Data type
Numeric

Consider phenotypic appearance.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1No
2Yes

Number of ears randomly harvested and characterized in the lab.

Classification
Characterization descriptor
Data type
Numeric

Mean length of 10 random ears from the point of attachment on the ear peducle to the tip of the dehusked ear.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
cm

Number of rows of kernel on 10 randomly selected ears.

Classification
Characterization descriptor
Data type
Numeric

Kernel type.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
AMFloury
SASemi floury
ATSemi dent
SFSemi flint
FTFlint
PPPop
SWSweet
OPOpaque

Three colours observed in order of frequency.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1White
2Yellow
3Purple
4Variegated
5Brown
6Orange
7Mottled
8White cap
9Red

Visual measurement whether the kernel colours are the same or not.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Uniform
2Not uniform

Visual measurement of the endosperm colour.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1White
2Cream
3Pale yellow
4Yellow
5Orange
6White cap

Visual measurement looking at longitudinal cut seed.

Classification
Characterization descriptor
Data type
Coded
CodeTermDescription
1Comp. corneous
2Almost corneous
3Partly corneous
4Almost starchy
5Comp. starchy

Weight of one thousand seeds adjusted to 10% moisture content.

Classification
Characterization descriptor
Data type
Numeric
Unit of measure
gr