Genetic Analysis of Tropical Maize Inbreds and Hybrids for Grain Yield and Traits Associated with Drought Tolerance
Abstract
221 words
Drought tolerance is a complex trait, hence genetic
improvement of this trait in maize requires indirect selection
methods based on highly heritable traits that correlate strongly
with grain yield. This study aimed at determining the modes of
gene action for grain yield and stress related traits under well
watered and water stressed environments. Fifteen inbred lines
were crossed using the NCII Design (L10 x T5). The resultant
50 hybrids, 4 checks and the parental lines were evaluated under
optimum and managed drought stress environments using a 0,1
alpha lattice design. The study showed significant GCA and
SCA effects for grain yield and its secondary traits suggesting
existence of both additive and non additive gene effects for the
traits under review. GCA and heritability across environments
for GY, ASI, EPP and SEN under drought were higher than in
well watered environments. Correlations of secondary traits
ASI, EPP and SEN with GY were stronger under drought than
under optimum conditions. SCA and STI had better predictive
value for F1 grain yield performance under drought. L2 and L7
can be released as CML lines and the AMMI stability analysis
confirmed L2 x T2 hybrid can be used a new single cross tester
for heterotic group A. Overall, selection in both stress and nonstress
gives a better picture of the best performing hybrids
across environments.
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