Genetic variability and association study of yield attributing traits in F2 populations of American cotton

Ali Hassan,Sana Munir,Muhammad Kamran Qureshi,Munazza Abbas,Muhammad Shehzad Anjam,Habib- Ur- Rehman Athar,Ahmad Naeem Shehzad,Muhammad Zubair Ishaq

doi:10.33865/wjb.006.02.0432

Ali Hassan, Sana Munir + Show 6 more

Open Access

https://doi.org/10.33865/wjb.006.02.0432

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Abstract

Cotton is one of the most important fiber crops, grown all over the world. Genetic variability is a crucial factor from evolutionary point of view for crop species. It defines the adaptation of populations by allowing them to alter their genetic constitution in changing environment. Genetic variability in Gossypium hirsutum is declining due to selection pressure, hence causing low yield. Present study was conducted to evaluate ten parental genotypes with their F2 generations to uncover their genetic potential for yield by accessing genetic variability, heritability, genetic advance and association between fiber, yield and yield linked traits. High values of phenotypic and genotypic coefficient of variance were observed for node of first fruiting branch, monopodia per plant, boll weight, fiber strength and yield per plant. All morphological and fiber quality traits represented broad sense heritability ranging from 51% to 90%. High value of genetic advance was shown by plant height and yield per plant. Positive association of yield per plant was recorded for traits such as plant height, node of first fruiting branch, monopodia per plant, number of bolls per plant, seeds per boll, and ginning out turn. Additionally, F2 progeny of CIM-534×MNH-814 had high yield per plant along with maximum number of bolls per plant and seed per boll. So, such F2 progeny can further be explored to improve yield and yield contributing traits.

Highlights

Cotton (Gossypium hirsutum) is the leading fiber-producing crop and is the backbone of the textile industry worth 600 billion dollars worldwide (Ashraf et al, 2018)
The cotton yield has been reduced due to high insects pests attacks as well as climate change like low and uneven distribution of rainfall in cotton-producing countries. Another reason for low yield and poor fiber quality was low genetic variability caused by domestication and repeated cycles of selection, which lead toward a narrow genetic base of cultivated germplasm of G. hirsutum (Seyoum et al, 2018)
Adhikari et al (2018) observed that the traits which had a high value of heritability broad sense and genetic advance were under the influence of Volume Number 6 ‖ Issue Number 2 ‖ Year 2021 ‖Page Number 21 the additive type of gene action

Summary

INTRODUCTION

Cotton (Gossypium hirsutum) is the leading fiber-producing crop and is the backbone of the textile industry worth 600 billion dollars worldwide (Ashraf et al, 2018). Higher estimates of heritability along with genetic advance and genotypic coefficient of variation were observed for traits such as plant height, monopodial and sympodial branches per plant, number of bolls per plant, and boll weight Such traits could be utilized as indirect selection criteria for yield improvement (Ahsan et al, 2015). Association study for yield improvement in F2 population of upland cotton revels that traits such plant height, sympodial and monopodial branches, number of bolls per plant, boll weight, ginning outturn were found to be positively correlated with yield; the negative interrelationship of yield and staple length was reported (Yaqoob et al, 2016). Genetic improvement and selection of exceptional genotypes from segregating populations of cotton crop rely upon the initial genetic variability estimation along with correlation studies of yield attributing parameters

OBJECTIVES

Population

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DISCUSSION