Estimates of Heterosis and Gene Action for Yield Components and Fiber Traits in Gossypium barbadense, L | ||||
| Journal of Plant Production | ||||
| Article 21, Volume 8, Issue 12, December 2017, Page 1439-1444 PDF (212.4 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2017.42031 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. H. M. Orabi; Samia E. Ali; H. A. El-Hoseiny; Eman M. R. Saleh | ||||
| Cotton Research Institute, ARC, Giza | ||||
| Abstract | ||||
| The present work was carried out in three successive seasons from 2014 to 2016.at Sakha Experimental Station at Kafr El-Sheikh Government, AgriculturalResearchCenter. Four cotton genotypes i.e., Giza 94, Uzbekstan1, TNB and BBB as (lines) which were crossed to two genotypes i.e., CB 58 and Giza 45 as (testers) by using the mating design line x tester. General (GCA) and specific (SCA) combining abilities and their effects as well as heterosis and heritability were estimated in parents, F1's and F2's populations for the traits, yield and its components and fiber properities to define the best parents and crosses to be used in breeding programs to improve cotton traits. Giza 94 x CB 58 gave the highest mean performance values in F1’s for seed and lint cotton yields/ plant, fiber length and its uniformity while, for boll weight in both F1’s and F2’s crosses for the cross of Uzbekstan1x CB 58 had the highest mean performance value in F2’s crosses for seed and lint cotton yields/ plant while for the cross BBB x CB 58, it gave the highest mean performance in both F1’s and F2’s crosss for lint %. All the tested crosses showed significant positive mid-parent heterosis. SCA variances were higher in magnitude as compared to the GCA ones. The nonadditive gene effects were larger in magnitude than the additive ones and revealed the major role in the heredity of all traits under studying. The two crosses Giza 94 x CB 58 and BBB x Giza 45 ranked first in this respect. The line Giza 94 and, the tester Giza 45 had the best ranking as combiners for almost traits. The estimated proportion contributions of used lines were higher in magnitude than those of both testers and lines by testers interactions for the following traits: seed cotton yield/ plant, fiber length and Uniformity ratio; while testers proportion contributions were higher than those estimated for lines and lines by testers interactions for boll weight, lint % and fiber strength. The higher value of broad-sense heritability (99.0%) was recorded for the trait seed cotton yield /plant and the lower value (26.12 %) was recorded for fiber length in F2. Heritability estimates in narrow-sense ranged from 0.25 - 29.31 % for uniformity and lint %, respectively. The cross Giza 94 x CB 58 could be used in breeding program for improving seed and lint cotton yields due to both parents. Giza 94 and CB 58 varieties were first in ranking as combiners for yield and its component. In addition the hybrids BBB X CB 58 and Uzbekstan1 X CB 58 could be used for improving the same traits because one of the involved parents was good combiner. | ||||
| Keywords | ||||
| line x tester; Cotton; gene action; Combining ability | ||||
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