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Core Collection of Sorghum

I. Stratification Based on Eco-Geographical Data

^a Purdue Univ., 1150 Lilly Hall of Life Sciences, West Lafayette, IN 47907
^b ICRISAT-GREP Patancheru, 502 324 A.P., India
^c Université Montpellier III/IRD, BP5045, 34 032 Montpellier Cedex 1, France

View larger version (16K): [in a new window]   Fig. 1. Frequency distribution according to latitudinal ranges (LR) for differences between the kharif and rabi in (A) flowering date (FL), and (B) plant height (PHT) in the ICRISAT sorghum landrace collection. Variables were divided according to their quartiles (Table 1). Each variable representing 25% of the total collection characterizes a photoperiod-sensitive class

View larger version (77K): [in a new window]   Fig. 2. Photoperiod-sensitivity distribution of frequencies for days to flowering (FL) or plant height (PHT) classes according to latitudinal range and racial classification for the ICRISAT sorghum landrace collection. Races are designated by the first letter of their names: B for bicolor, C for caudatum, D for durra, G for guinea, K for kafir; and intermediate races are coded with two letters, for example, CB for caudatum-bicolor. A number preceding the letter race name indicates the latitudinal range: 1, LR-1; 2, LR-2; 3, LR-3; and 4, LR-4. FL1 and PHT1 are represented with lozenges, FL2 and PHT2 with blank, FL3 and PHT3 with dashes, FL4 and PHT4 with pattern of squares

View larger version (15K): [in a new window]   Fig. 3. Principal component analysis for 10 morpho-agronomic variables in the ICRISAT sorghum landrace collection. Bi-plot is shown for the rotated (Varimax) factor-scores for 50 accessions randomly selected within each cluster of photoperiod sensitivity. Cluster membership was defined from the eight photoperiod variables using the K-means procedure