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Genetic Diversity among CIMMYT Maize Inbred Lines Investigated with SSR Markers

I. Lowland Tropical Maize

^a Inst. of Crop Breeding and Cultivation, Chinese Academy of Agricultural Sciences, Zhongguancun South Street No. 12, 100081, Beijing, China
^b CIMMYT, Int. Applied Biotechnology Center, Apdo Postal 6-641 06600 Mexico D.F., Mexico
^c Inst. of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany

View larger version (17K): [in a new window]   Fig. 1. Histograms of pairwise modified Roger's distances based on 79 SSR markers within the tropical (A) white (86 inbred lines) and (B) yellow (69 inbred lines) groups, and (C) between the two groups.

View larger version (50K): [in a new window]   Fig. 2. Associations among tropical white inbred lines revealed by average linkage (UPGMA) cluster analysis based on modified Roger's distance. Lines extracted from (i) Tuxpeño and related dents, ; (ii) Cuban, Costal Tropical, and Cateto flints, ; and (iii) miscellaneous origin, .

View larger version (13K): [in a new window]   Fig. 3. Principal component analysis of inbred lines extracted from heterotic group A (Pop21, 22, 29, 49, and Pool 24), ; heterotic group B (Pop32), ; heterotic group C (Pop25), ; and heterotic group D (Pop43), . CML247 (*) and CML254 (+) were used as testers in the development of inbred lines. PC1 and PC2 are the first and second principal components, respectively.

View larger version (44K): [in a new window]   Fig. 4. Associations among tropical yellow inbred lines revealed by average linkage (UPGMA) cluster analysis based on modified Roger's distance. Lines extracted from (i) Tuxpeño and related dents, ; (ii) Cuban, Costal Tropical, and Cateto flints ; and (iii) miscellaneous origin, .