GENETIC CORRELATION AND CONTRIBUTION OF SOME PHYSIOLOGICAL TRAITS TO YIELD IN SOME SELECTED MAIZE GENOTYPES
Shaibu, A. S.
Department of Agronomy, Bayero University, Kano, Nigeria
Adnan, A. A
Department of Agronomy, Bayero University, Kano, Nigeria
Rabiu, I. U.
Department of Agronomy, Bayero University, Kano, Nigeria
1-11
Vol: 5, Issue: 4, 2015
Receiving Date:
2015-08-04
Acceptance Date:
2015-09-05
Publication Date:
2015-10-03
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Abstract
Yield components have influence on ultimate yield both directly and indirectly. Splitting of
total correlation into direct and indirect effects, therefore, would provide a more meaningful
interpretation of such association. An experiment was conducted to study the genotypic
correlation and character contributions of some physiological traits (stomatal conductance,
canopy temperature, leaf temperature and chlorophyll content) to yield in maize. Genotypes
used were Sammaz 14, Sammaz 29, 2009 EVDT, 2009 TZE–W, TZE COMP-5 and 2009
TZEE,laid out in a randomized complete block design with three replications. Genotypic and
phenotypic correlations were estimated. Path analysis was used to determine the direct and
indirect effects of the physiological traits on grain yield. The results obtained revealed no
significant difference between the genotypes for yield and physiological traits observed.
However, the genotype showed good responses to the physiological traits and these can be
manipulated to develop drought tolerant genotypes. Heritability, phenotypic and genotypic
coefficient of variation was observed to be low. These can be attributed to high
environmental variance than genotypic and phenotypic variance. However, stomatal
conductance had heritability of 30%. Canopy temperature had a negative direct effect on
yield. But the indirect effects were low. Leaf temperature had an indirect effect on yield
through canopy temperature. The direct effect of stomatal conductance was high and
positive. Stomatal conductance had a positive genotypic and phenotypic correlation with
grain yield whilecanopy temperature had a negative genotypic and phenotypic correlation
with grain yield.
Keywords:
genotypic correlation, heritability, path analysis, physiological traits, yield
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