GENETIC GAIN AND SELECTION CRITERIA EFFECTS ON LINT YIELD AND YIELD COMPONENTS IN SEGREGATING POPULATION (GIZA 88 X A 13 ) | ||||
| Menoufia Journal of Plant Production | ||||
| Article 5, Volume 6, Issue 3 - Serial Number 2, March 2021, Page 165-178 PDF (288.68 K) | ||||
| Document Type: original papers | ||||
| DOI: 10.21608/mjppf.2021.163665 | ||||
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| Abstract | ||||
| Gains from application Index selection are very important in cotton breeding program, thus the main objective of this study was to estimate the genetic advance obtained by application of fifteen selection procedures, 11 indices and 4 pedigree line selection after two cycles to improve lint yield and other components with acceptable fiber quality in early segregating population of cross (G.88 * A 13) . The data showed increased in mean performances for all characters with advanced generations from F2 to F4 indicating an accumulation of favorable alleles. The advanced generations F3 and F4 showed reduction in PCV and GCV as compared with F2 generation. Most characters showed high heritability values in broad sense over 60 %. Genotypic correlations in most cases were higher than phenotypic ones in both F2 and F3 generations. Lint yield / plant, seed cotton yield / plant, bolls / plant showed highly significant positive desirable phenotypic and genotypic correlation with other yield contributed characters in both F2 and F3 generations. Boll weight showed desirable significant correlations with other yield characters in both F2 and F3 generations. The genetic correlation between fiber length and fiber strength was highly significant positive. The undesirable negative correlation which existed between fiber length with other yield characters in F2 and F3 generations were broken and converted to desirable values. The highest predicted genetic advance from F2 and F3 generations were obtained with the index I.W12 followed by I.W2 and I.W23 This was true since lint yield /plant showed significant positive correlation with the other yield contributed characters. The highest actual genetic gains from F3 generation for lint yield /plant occurred by IW123, IW12 and most selection indices. Maximum predicted genetic advance for lint yield / plant from F3 and F4 generations were achieved when selecting for three components lint yield/plant,bolls/plant and seeds/ boll as well as for lint yield /plant alone. Selection for lint yield /plant alone gave moderate predicted and actual value in three generations followed by index involved lint yield /plant with bolls/plant. The direct selection for seeds/ boll and selection for lint /seed gave low predicted advance in lint yield. Deviation of the actual advance from the predicted ones were positive and low for most indices, which due to the minor relatively role of non –additive effects and the additive genetic effective would appear to be predominant. On the other side high discrepancy was observed between predicted and actual gains from selection when applied selection for seeds/boll, lint /seed and selection index for seeds/boll with lint/seed this was due to non-additive gene effect and large affected by environmental factors High discrepancy was observed between predicted and actual gains from selection for most procedures and advance would decrease in F4 generation as compared with F3 for all characters. The role of selection in improvement is that acts on the genetic variances within a population, isolates and increases the desired genetic frequency within the population, and thus, the population means changes towards to a desired value. Thus breeder could selected some families which characterized by high yielding capacity with acceptable fiber properties and utilize such selected families in breeding program aiming to improvement yield and quality in cotton. | ||||
| Keywords | ||||
| Predicted gain; Realized gain; Selection procedures; cotton; improvement; selection index | ||||
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