Genetic variability for yield and fiber related traits in genetically modified cotton

Abstract

Background Cotton (Gossypium hirsutum L.) is grown for fiber and oil purposes in tropical and sub-tropical areas of the world. Pakistan is the 4th largest producer of cotton. It has a significant contribution in the GDP of Pakistan. Therefore, the present study was performed to assess the genetic variations and genetic diversity of yield and fiber quality traits in cotton and to analyze the associations present among them. Results Analysis of variance exhibited significant variation for all studied traits except total number of nodes and the height to node ratio. The phenotypic coefficient of variation was higher than the genotypic coefficient of variation for all studied traits. Plant height, monopodial branches, total number of bolls, lint index, seed index, and seed cotton yield displayed high heritabilities in a broad sense with maximum genetic advance. Correlation analysis revealed that seed cotton yield had a significant positive association with plant height, the number of monopodial branches, the number of sympodial branches, ginning outturn (GOT), the number of bolls, seed per boll, seed index, uniformity index, the number of sympodial branches, reflectance, and seed index at the genotypic level while a significant positive relationship was observed with plant height, the number of sympodial branches, boll number, and GOT. Plant height, monopodial branches, GOT, boll weight, seeds per boll, and short fiber index exerted direct positive effects on seed cotton yield. The first 6 principal component analysis (PCs) out of the total fourteen PCs displayed eigenvalues (> 1) and had maximum share to total variability (82.79%). The attributes that had maximum share to total divergence included plant height, uniformity index, the number of sympodial branches, seed per boll, GOT, seed cotton yield, and short fiber index. Conclusion The genotype AA-802, IUB-13, FH-159, FH-458, and CIM-595 were genetically diverse for most of the yield and fiber quality traits and could be utilized for the selection of better performing genotypes for further improvement.

Genetic variability studies for yield components and fibre quality traits in upland cotton (Gossypium hirsutum L.)

“…This suggests that genetic variance played a major role in the inheritance of the number of monopodial branches and the number of bolls, thus intensive selection at earlier generations can reduce the vegetative branches. A similar result was reported by Khokhar et al (2017), Sahar et al (2021) and Rao et al (2021). Moderate phenotypic coefficient of variation was recorded for the number of sympodia per plant (16.43 %), boll weight (13.42 %), the number of seeds per boll (13.38 %), seed cotton yield (16.42 %), lint index (13.69 %), and fibre fineness (11.08 %).…”

“…The analysis of variance revealed highly significant (@ 1%) differences for all the traits except elongation percentage, which is significant at 5% (Tables 2 and 3). These findings are in concordance with Sahar et al (2021), Ishaq et al (2021), Nawaz et al (2019) and Nikhil et al (2018).…”

Impact of Heat Stress on Agro-Morphometric and Fiberrelated Traits in Indigenous Upland Cotton Genotypes Under Semi-Arid Conditions

“…However, the genetic diversity for the number of nodes per plant and CLCuV incidence percentage was significant only. Similar observations were also reported by Bhatti et al (2020a), Bhatti et al (2020b), Hassan et al (2021 and Sahar et al (2021) who showed the presence of significant variations among cotton genotypes that could be used to improve seed cotton yield.…”

Assessment of Fiber and Yield Related Traits in Mutant Population of Cotton

“…In the case of cotton where the almost 95% area is cultivated for G. hirsutum, the narrow genetic background is a problem. There are fewer genetic differences among the cultivated varieties of cotton (Sahar et al, 2021). It is the need of the hour to broaden the genetic makeup of our cultivated verities (Van Becelaere et al, 2005).…”