VARIABILITY AND COVARIABILITY OF AGRONOMIC CHARACTERISTICS IN 14 KENAF GENOTYPES | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 19, Volume 91, Issue 2, July 2013, Page 629-639 PDF (434.8 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2013.163544 | ||||
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| Authors | ||||
| AFAF E. ZAHANA1; AMANY M. EL-REFAIE2 | ||||
| 1Field Crops Res.Inst., ARC, Giza, Egypt | ||||
| 2Field Crops Res .Inst., ARC, Giza, Egypt | ||||
| Abstract | ||||
| A field experiment was conducted during 2009, 2010 and 2011 seasons at Ismailia Agricultural Research station, Ismailia Governorate, Egypt, to study the variability and covariability of 14 kenaf genotypes including green stalk yield, fiber yield and their related characters. The experimental design was randomized complete block with three replications per each of the three environments (seasons ). Mean square values showed highly significant differences among genotypes (G) and genotypes x environments (E) interaction for green stalk yield and its components viz.: plant height, technical stem length, fiber yield and fiber percentage as well as seed yield and fruiting zone length. Variances due to differences among genotypes (G) were higher than those due to the interaction (G x E) for all characters studied except fiber yield/fed. These results indicated that most of the variability for these traits were mainly controlled by genetic factors less influenced by environmental factors. This means that the improvement of these traits could be achieved by selection. Heritability values (Hb.s.) in broad sense were high for seed weight/plant followed by plant height and technical stem length. Also, the observed narrow range between phenotypic (PCV) and genotypic (GCV) coefficients of variability, which gave almost similar values of PCV and GCV for seed weight/plant were mainly due to genetic differences as evidenced from the very high heritability. Also, fiber weight per plant, plant height and technical stem length showed similar results, indicating the possibility of usingthese yield components in selection index giving more weight for plant height and technical stem length for improving green weight/plant. Kenaf cultivars, S.105/2 and S.96/20 proved maximum (first or second ranking for mean performance) for most characters studied. While, the first ranking was recorded by S.96/20 for seed yield per fed as well as S.116 for seed weight per plant and S.8 for fruiting zone length. Therefore, the previous mentioned genotypes specially S.105/2 may be released as a commercial cultivar and/or to be incorporated as breeding stocks in kenaf breeding program aiming at producing high yielding lines. Phenotypic and genotypic correlation coefficients among green stalk weight, fiber weight per plant and their related characters of 14 kenaf genotypes averaged over the three environments, indicated that, plant height and technicalstem length are the major components contributing to green stalk weight per plant. Therefore, selection for these traits may improve green stalk weight per plant and in turn fiber yield in kenaf. | ||||
| Keywords | ||||
| AGRONOMIC CHARACTERISTICS | ||||
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