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Genetic Analysis of Inbred and Hybrid Grain Yield under Stress and Nonstress Environments in Tropical Maize

^a Corn Breeding and Genetics Program, Texas A&M University, College Station, TX77845
^b International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 México D.F., México
^c International Maize and Wheat Improvement Center (CIMMYT). P.O. Box MP163, Harare, Zimbabwe
^d Pioneer Hi-Bred Int., Box 609, Waimea, HI 96796

View larger version (37K): [in a new window]   Fig. 1. General combining ability effect estimates (GCA) for grain yield across 12 environments for 17 tropical white maize inbred lines. Environments are 1: TL96AS, 2: TL96AIS, 3: TL96AWW, 4: PR96AWW, 5: CO96AWW, 6: OB96BISHS, 7: TL96BWW, 8: PR96BHN, 9: PR96BLN, 10: CO96BWW, 11: TL97AISHD, and 12: TL97AISLD.

View larger version (30K): [in a new window]   Fig. 2. Proportion of additive (lower bar) and nonadditive (upper bar) genetic variance for grain yield at 12 stress and nonstress environments and across environments in a diallel among 17 tropical maize inbreds.

View larger version (12K): [in a new window]   Fig. 3. Covariance between parental inbreds and hybrids (Wr) vs. variance of all the hybrids in each parental array (Vr) in Hayman's graph for grain yield across environments in a diallel among 17 tropical maize inbreds (CMLs, TS inbreds, LP inbreds).

View larger version (17K): [in a new window]   Fig. 4. Midparent (inbreds)-offspring (hybrid) correlation for grain yield (Mg/ha) at 12 stress and nonstress environments and across environments in a diallel among 17 tropical maize inbreds.

View larger version (24K): [in a new window]   Fig. 5. Cluster analysis (Ward's Minimum Variance) of 12 stress and nonstress environments based on grain yield of hybrids in a diallel among 17 tropical maize inbreds.

View larger version (17K): [in a new window]   Fig. 6. Additive Main Effects and Multiplicative Interaction (AMMI) biplots for grain yield in hybrids (GCA effects) and inbred lines in a diallel among 17 tropical maize inbreds ( CMLs, TS, LP) evaluated in 12 stress and non-stress environments ().