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Published online 27 October 2005
Published in Crop Sci 45:2573-2582 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Diversity among CIMMYT Maize Inbred Lines Investigated with SSR Markers

II. Subtropical, Tropical Midaltitude, and Highland Maize Inbred Lines and their Relationships with Elite U.S. and European Maize

X. C. Xiaa, J. C. Reifb, A. E. Melchingerb, M. Frischb, D. A. Hoisingtond, D. Beckc, K. Pixleyc and M. L. Warburtonc,*

a Institute of Crop Breeding and Cultivation, Chinese Academy of Agricultural Sciences, Zhongguancun South Street 12, 100081, Beijing, China
b Inst. of Plant Breeding, Seed Science and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
c CIMMYT, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico
d ICRISAT, Patancheru, Hyderabad 502-324, Andhra Pradesh, India



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  		Fig. 1. Associations among subtropical white and yellow inbred lines revealed by unweighted paired group method using arithmetic averages cluster analysis based on modified Roger's distance (horizontal axis). Lines were extracted from Pool31 and Pop34 ({blacksquare}), Pool32, Pop42, 47, 402, and 500 ({square}), Pool33 and Pop33 ({blacktriangleup}), Pool34 ({Delta}), Pop501 and 502 ({diamondsuit}), Pop43SR, 44 and 63 ({diamond}), and others (•).

 


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  		Fig. 2. Principal coordinate analysis based on modified Roger's distance. PC1, PC2, and PC3 are the first, second, and third principal coordinate, respectively. CIMMYT maize lines extracted from three pairs of heterotic populations used in the subtropical hybrid program are Pop33 ({square}) x Pop45 ({blacksquare}), Pop42({circ}) x Pop44 (•), and Pop501 ({Delta}) x Pop502 ({blacktriangleup}).

 


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  		Fig. 3. Principal coordinate analysis based on modified Roger's distance. PC1 and PC2 are the first and second principal coordinate, respectively. Tropical highland (*) and midaltitude ({diamond}) CIMMYT maize lines.

 


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  		Fig. 4. Associations among tropical ({Delta}), subtropical ({blacksquare}), midaltitude ({square}), highland ({blacktriangleup}), U.S./Canadian ({diamondsuit}), and European ({diamond}) maize germplasm revealed by unweighted paired group method using arithmetic averages cluster analysis based on modified Roger's distance (horizontal axis).

 




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