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EARLINESS COMPONENT ANALYSES FOR SOME HIGH YIELDING EGYPTIAN COTTON GENOTYPES
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Abstract: This investigation was conducted with the objective of evaluating inheritance and interrelationships of earliness indices and obtaining guidelines for efficient parents' choice of cotton cultivars in hybridization breeding programs for developing improved genotypes for yielding and earliness. Two cultivars, Giza 80 and Giza 90 and two new promising cross genotypes, Giza 90 x Australian and [G83 x (G75x 5844)] x G80 were crossed in a half diallel mating scheme in 2013. Field evaluation of the 10 genotypes (parents and F1 crosses) was made in 2014 in a randomized complete block design with three replications in the Sids Research Station. Seed cotton yield per plant along with seven earliness indices (date of first flower, date of first open boll, boll maturation period, earliness index, percentage of crop harvested, mean maturity date and production rate index) were used in this study. Results indicated that date of first flower, date of first open boll and boll maturity period showed significant additive genetic variance. The new Egyptian cotton genotypes, Giza 90 x Australian and [G83 x (G75x 5844)] x G80 were good general combiner for most earliness characters and yield. Correlation analysis showed that date of first open boll and boll maturity period were correlations in the desirable direction with seed cotton yield per plant. This indicated that selection for high yield and low in both earliness traits is required. The estimates of heritability for most earliness indices traits were high, ranged from 0.35 to 0.98, suggesting that pedigree selection method may be useful for effective improvement in these indices and yield.
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| Publication year |
2015
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| Pages |
1091 – 1100
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| Organization Name |
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| Author(s) from ARC |
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| Publication Type |
Journal
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