Characterization data of NPGRL cowpea accessions (2012-2014)
The dataset contains morphological descriptions of cowpea accessions conserved at NPGRL. NPGRL regenerates and characterizes plant germplasm primarily to assist the breeders and other researchers. The descriptors used in the characterization are based on IPGRI descriptors for cowpea (1983; 2009) and UPOV traits for yardlong bean (2009).
Plant pigmentation
Recorded for stem, branches, petioles and peduncles in the sixth week after sowing
Plant height
Recorded at maturity when pods are already harvested; mean of 10 randomly selected plants
Plant vigor
Based on plant width and height 3-4 weeks after sowing
Total harvest
over total harvest (%)
Pericarp thickness
Fresh pods
Number of pods per peduncle
Recorded under total insect control. Mean of 10 randomly selected peduncles
Days to first mature pods
Number of days from sowing to stage when 50% of plants have mature pods
Pod length
In cm. Mean of the 10 longest mature pods from 10 randomly selected plants
Duration of flowering
Days from first flowers to stage when 50% of the plants have finished flowering
Pod attachment to peduncle
Recorded when pods are full grown
Flower pigment pattern
Of newly opened flowers
Number of seeds per pod
Mean number of seeds from 10 randomly selected pods
Pod curvature
Of mature pods
Yield per plant
Mean weight of all harvested pods of each plant per accession after being dried to appropriate moisture content
Days to flowering
Number of days from planting to 50% of plants with at least one open flower
Seed length
In mm. Mean of 10 mature seeds excluding those from the extremities of pods
Stipule width
Recorded in mm
Seed thickness
In mm. Mean thickness of the ten seeds measured for length in 3 ; measured perpendicular to length and width
Seed crowding
A visual estimate of seed compression, being indicative of spacing within the pod
Terminal leaflet length
Recorded in cm for the terminal leaflet whose shape was recorded in 5
Leaf color
Intensity of leaf colour
Hypocotyl color
Recorded at the time when primary leaves are fully expanded
Number of nodes on the main stem
Recorded 3-4 weeks after sowing
Number of raceme per plant
Mean of 10 randomly selected plants
Terminal leaflet shape
Recorded for the terminal leaflet of a young,mature leaf in the 6th week after sowing
Days to emergence
Number of days from planting to 50% seedling emergence
1st harvest
over total harvest (%)
Peduncle length
In cm. Recorded when peduncles have grown full length. Mean length of 10 peduncle, one from each randomly selected plants
Number of locules per pod
Mean number of 10 pods
Pod width
In cm. Mean width of 10 pods measured for length in 5
Ten (10) Pod weight
From 10 randomly selected pods after being dried to appropriate moisture content
Calyx lobe length
In mm; the mean length of 10 freshly opened flowers
Immature pod pigmentation
Pattern of pigment distribution on full grown immature pods
Raceme position
Recorded when peduncle have reached full length
Number of pods per plant
From 10 randomly selected plants
Mature pod color
Of mature pods
Number of main branches
The branches whose origin is in the leaf axils on the main stem; recorded in the 8th week after sowing
Seed width
In mm. Mean width from hilum to keel of the ten seeds measured for length in 3
Percentage of first harvest
over total harvest (%)
Stipule length
Recorded in mm
Terminal leaflet width
Recorded in cm, the widest dimension of the terminal leaflet whose shape was recorded in 5
Leaf marking
Presence/absence of V-mark on leaflets
100 seed weight
Weight of 100 seeds in g, moisture content 12%
Plant hairiness
Of stem, leaves and pods
Hypocotyl length
Mean of 10 plants
Standard petal length
Mean length of 10 freshly opened flowers,randomly selected standard petal
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