Genetic Variability and Performance of Cotton (Gossypium hirsutum L.) Genotypes for Yield Related Agro-Morphologic and Fiber Quality traits under Water Deficit Natural Environment
Genetic Variability and Performance of Cotton (Gossypium hirsutum L.) Genotypes for Yield Related Agro-Morphologic and Fiber Quality traits under Water Deficit Natural Environment
Hafeez-ur-Rehman1*, Umar Farooq1, Muhammad Asim Bhutta2, Saghir Ahmad2, Muhammad Akram2, Muhammad Rafiq Shahid2, Hammad Hussnain2, Muhammad Shahid2, Muhammad Mehmood Iqbal2, Ali Raza2 and Muhammad Iqbal2
ABSTRACT
Development of cotton (Gossypium hirsutum L.) cultivars with natural tolerance to drought stress is the foremost agenda of cotton breeders these days under the current scenario of climate change. The major purpose of the present study was to evaluate the cotton genotypes under naturally developed water-deficit condition and evaluating them in comparative study with natural full irrigation condition. For the purpose, seven cotton genotypes along with a drought tolerant check (FH-142) were evaluated for two cotton growing seasons (2018 and 2019) to study their performance in terms of yield, drought response indices along with other agro-morphological and fiber quality traits in both irrigation regimes. Analysis of Variance (ANOVA) showed existence of considerable genotypic variations for studied traits. Genotypes with high GMP and low DSI were selected as potential drought-tolerant genotypes. Under drought stress condition, cotton yield had a strong positive association with NBP, PH and significantly positive with BW; whereas negative with GOT, FS. These results depict that NBP, PH and BW are the major contributors towards yield under drought stress. Results also emphasized that water-deficit situation seriously impact ginning out turn and fiber strength in cotton. Based on AMMI scatter plot, three genotypes and one check were found tolerant to drought stress. The objective of the study is to evaluate genotypes under drought stress and utilize the best performing drought tolerant genotypes in breeding programme for the development of drought tolerant cotton varieties. The studied genotypes SLH-105,SLH-106,SLH-107, SLH-108, SLH-109, SLH-110, SLH-11can be exploited as a new drought tolerant high yielding cotton variety and also as a genetic resource in various breeding programs with the aim to improve drought tolerance in cotton.
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