Correlation Coefficients Between Physiology, Biochemistry, Common Economic Traits and Yield of Cotton Cultivars Under Full and Deficit Irrigated Conditions.

Abstract

Drought is a common abiotic stress that considerably limits crop production. The objective of this study is to explore the influence of water deficiency on the yield and physiologic-biochemical in upland cotton cultivars (Gossypium hirsutum L). Cotton cultivars, 'Ishonch', 'Navbakhor-2','C-6524' and 'Tashkent-6' were selected to study the relationships among their physiologic, biochemical and yield attributes during water deficiency. Deficit irrigation was designed by modifying the traditional watering protocol to reduce water use. Results indicate that cotton cultivars respond differently to water deficit stress. Water deficit significantly influenced plant valuable economic traits and yield in four cultivars. However, yield components such as the number of bolls per plant, seed number per boll, mass of boll per plant and productivity plant yield were significantly reduced only in and C-6524 and Tashkent-6. The malondialdehyde decreased and total chlorophyll, chlorophyll "a" increased in 'Ishonch' and Navbakhar-2 under deficit irrigation conditions. The direct relationship between physiology, biochemistry, valuable economic traits, and yield may be a useful selection criterion for determining candidate parents for cotton drought tolerance breeding.

Asparagine and nitric oxide jointly enhance antioxidant capacity and nitrogen metabolism to improve drought resistance in cotton: Evidence from long‐term field trials

“…However, potential explanations for the enhancements in cotton boll seed weight, the yield of seed cotton, boll numbers, and ginning turnout percentage might include boosted plant growth and development, a reduction in premature flower and boll drop, and an enhancement in photosynthesis activity (Chandel & Sharma, 2022; Shaukat et al, 2021). The application of both compounds in combination showed a significant improvement in various agronomic characteristics, which may be a result of their synergistic effect working together to enhance plant growth and development, reduce flower and boll drop, and improve photosynthesis activity (Shavkiev et al, 2020).…”

“…Cotton, a vital fiber crop worldwide, is particularly vulnerable to the negative impacts of drought stress. Drought stress can reduce cotton's growth, water content, photosynthesis, and yield (Shavkiev et al, 2020). Drought stress can also disrupt cotton's nitrogen metabolism by decreasing key enzyme activities, including nitrate reductase and glutamine synthetase, leading to lower nitrogen uptake and use (Qiao et al, 2019).…”

Genetic basis and principal component analysis in cotton (Gossypium hirsutum L.) grown under water deficit condition

“…Final impact of this malnutrition is dropping of leaves and fruits from plant, and final yield is drastically reduced (Pettigrew, 2004). The shedding of flowers and leaves due to water deficiency in cotton is also reported by many scientists (Bozorov et al, 2018;Shavkiev et al, 2020).…”