Heritability and Genetic Advance as Selection Indicators for Improvement in Cotton ( Gossypium hirsutum L.)
ABSTRACT The investigation pertaining to heritability and genetic advance in cotton genotypes for some quantitative and qualitative traits were undertaken. The results indicated highly significant differences among the parents and F1 crosses for all the traits. Plant height and seed cotton yield per plant displayed moderate to higher estimates of heritability and genetic advance which is indicative of additive with partial dominance type of gene action suggesting the feasibility of selection in the early generation, while bolls per plant, boll weight and staple length exhibited moderate to high heritability and low genetic advance which indicated over dominance type of gene action thereby revealing that selection might be useful if delayed. The traits monopodia and sympodia per plant gave low to moderate heritability and low genetic advance but the trait micronaire value manifested high heritability coupled with low genetic advance.
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ABSTRACT: The leaf area, petiole length and seed cotton yield were measured in six generations of a cross between cotton (Gossypium hirsutum L.) varieties (namely, NuCOTN-35B & NIAB-111) to study the genetic mechanisms controlling these characters, and to examine the relationship among them during 2002-2004. Five parameter models, m, (d), (i), (j), (l) for leaf area, while m, (d), (h), (i), (j) for petiole length and seed cotton yield were found adequate for genetic analysis. Genetic analysis through generation means for leaf area (cm 2 ) indicated that this trait is controlled by the genes acting additively and complicated by (additive × additive) (i), (additive × dominance) (j) and (dominance × dominance) (l) interactions. The genetic analysis of the data for petiole length (cm) and seed cotton yield (g) revealed that both additive and dominance gene effects controlled these two traits. Potence ratio was greater than unity for leaf area and petiole length, showing over-dominance for them. For seed cotton yield, the potence ratio of 0.75 revealed partial dominance. Narrow sense heritability for leaf area (0.80), petiole length (0.62) and seed cotton yield (0.71) was moderate, suggesting the chances for improving these characters through selection from the segregating populations. Strong positive associations among the three traits suggest that indirect selection for these photosynthetic activity-enhancing traits would be helpful in improving seed cotton yield in cotton.01/2008;
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ABSTRACT: Two marker systems, 19 RAPD and 8 agronomic traits were used to estimate the genetic diversity in Egyptian cotton. RAPD primers produced a total of 101 amplicons, which generated 86.25% polymorphism. Number of amplification products ranged from 2 to 7 where percent genetic similarity for the studied primers ranged from 72.2% to 89.9% with an average 81.4%. PIC values of the RAPD markers ranged from 0.855 (UBC 20) to 0.909 (UBC 54) with an average of 0.896 per marker. Highly significant differences were obtained between genotypes for all traits except boll weight, lint percentage and fiber strength. PCV were higher than its corresponding GCV for number of open bolls per plant, boll weight, seed cotton and lint yields per plant. However, no great difference between PCV and GCV for the three fiber characters. Broadsense heritability estimates were ranged from 17.18% to 90.97% for boll weight and fibre strength, respectively. High genetic advance under selection was noted for lint cotton yield per plant, seed cotton yield per plant, number of open bolls per plant, fiber strength, fiber length and micronair value. However, low genetic gain obtained for boll weight and lint percentage. Number of bolls per plant showed high positive phenotypic correlation coefficients with both seed cotton and lint yields per plant. This study of the genetic diversity of Egyptian cotton varieties with RAPD markers and agronomic traits support the need to introduce new alleles into the gene pool of the Egyptian cotton breeding program.Journal of American Science,. 12/2011; 7(7):1107-1115.
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ABSTRACT: KaRimizadeh, R., m. mohammadi, m. aRmion, m. K. Shefazadeh and h. ChalajouR, 2012. determining heritability, reliability and stability of grain yield and yield-related components in durum wheat (Triticum durum l.). Bulg. J. Agric. Sci., 18: 595-607 The major objectives of the study were to (1) evaluate genotypic yield performances of eighteen durum wheat genotypes, (2) determine their reliability and stability parameters and (3) estimate variance components and heritability of yield and yield-related traits. eighteen durum wheat genotypes were evaluated in two conditions (rainfed and well watered) in ilam and Gachsaran agricultural research stations of iran during from 2009 to 2011 to identify patterns of genotype by environment interactions and their stabilities in terms of seed yield and yield-related components. Seed yield and its components are af-fected by plant genotype and environmental conditions. There were significant differences between genotypes of one or two years at each location for all the traits. Significant differences among years or between conditions were obtained in terms of all traits. Genotypes x environment interactions at all the traits were highly significant. Thus, the stabilities of eighteen durum wheat genotypes were different for all the traits. according to the stability parameters, G6 and G12 genotypes were stable for grain yield. Genotypes, Ga//2*Chen/ alTaR84 and ShaG_26/SniTan were considered as having high adaptability to both rainfed and irrigated conditions while ouaSeRl -1(G5) and oSSl-1/4/mRBSh/3/RaBi//GS/CR/5/ hna (G8) were considered as having low adaptability to both rainfed and irrigated conditions. The estimates of heritability values with limited phenotypic variance definition were 0.006, 0.163, -0.025, 0.396, 0.327, 0.346 and -0.075 for grain yield, plant height, test weight, thousand kernel weight, peduncle length, spike length, and number of grains per spike ranged respectively. The heri-tability with complete phenotypic variance definition were 0.001, 0.025, -0.006, 0.040, 0.114, 0.164 and -0.024 for the same traits, respectively. moderate or low heritability values estimated for all the traits showed that family selection method could be used instead of individual selection in the breeding programs for improving grain yield and its components.Bulgarian Journal of Agricultural Science 05/2012; 18(4):595-607. · 0.14 Impact Factor