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Published in Crop Sci 39:1315-1324 (1999)
© 1999 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Selection Improves Drought Tolerance in Tropical Maize Populations

II. Direct and Correlated Responses among Secondary Traits

S.C. Chapmana and G.O. Edmeadesb

a CSIRO Tropical Agriculture, 306 Carmody Rd., St. Lucia, QLD 4067, Australia
b Pioneer Hi-Bred International, Inc., 7431 Kaumualii Highway, P.O. Box 596 Kekaha, HI 96752 USA



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  		Fig. 1 Grain yield versus grain number per square meter for 15 maize genotypes grown in nine environments differing mainly in the degree of water stress. For each environment, the slopes (x 10-3) (m) of linear regressions of grain yield on grain number per square meter are given. All were significantly different from zero (P < 0.05) except for Environment 9

 


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  		Fig. 2 Change in (a) ears per plant, (b) grains per ear, (c) grain number per square meter, and (d) grain yield with anthesis-silking interval for three selections in La Posta. A common linear regression has been fitted for the three genotypes in (a). Fitted regressions in (b), (c), and (d) are of the form in all cases. The coefficients of a and b for La Posta Sequía C0 (solid line), La Posta Sequía C3 (dotted line), and their related check (Pop. 43 C9, dot-dash line) are: for (b): 6.33, -0.106; 6.24, -0.132; 6.27, -0.116; for (c): 8.19, -0.197; 8.07, -0.193; 8.10, -0.171; and for (d): 2.21, -0.247; 2.08, -0.302; 2.21, -0.238

 




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