GENETIC ANALYSIS OF YIELD AND ITS COMPONENTS IN MAIZE (Zea mays L.) INBRED LINES USING LINE X TESTER ANALYSIS
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 53
Abstract
Estimates of combining ability analysis are important genetic attributes for maize breeders to look forward improvement in productivity through hybridization and selection. The analysis of variance revealed that the sufficient variability was present in the material studied. Relatively higher estimates of GCV were obtained for grain yield/plot, cob yield/plot, ear height, cobs/plot and final plant stand. High heritability coupled with high genetic advance was recorded for the traits, plant height, 1000 grain weight, ear height and final plant stand that depicts the existence of additive gene effects. Mean sum of squares was highly significant for traits such as grain yield, 1000 grain weight, days to 50% pollen shed and silking, plant and ear height, ear length, ear girth, cobs/plot etc. Mean sum of squares due to lines, testers and line×testers were found significant for almost all the characters studied from combining ability point of view. Though the variance due to lines and testers were not significant for cob yield/plot and grain yield/plot, but their effect for rest traits and interaction line x tester effect were found significant for all the characters, indicating that the parents used in this study differ significantly and there was a preponderance of non additive gene action for the characters. Variance due to sca was greater than gca variance for almost all the traits except for plant height and cob length. Among testers BML-6 (for traits grain yield/plot, cob yield/plot, ear height, plant height, ear girth, cobs/plot and final plant stand) and HKI 1344 (for traits days to 50% pollen shed and silking, days to 80% maturity, plant and ear height, ear length, ear girth) were observed as good testers and among the lines IAMI 24, IAMI 22, IAMI 13, V 938-37 and Z 486-7 were found to be good for various important traits. Hybrids IAMI 24/BML 6, IAMI 31/BML 6 and IAMI 22/BML 6 were identified as promising on the basis of SCA effect, heterosis and mean per se performance.
Authors and Affiliations
S. K. SINHA
Keywords
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