Effect of water deficiency on relationships between metabolism, physiology, biomass, and yield of upland cotton (Gossypium hirsutum L.)

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, physiologic and metabolomic attributes in upland cotton cultivars (Gossypium hirsutum L). Cotton cultivars, 'Ishonch' and 'Tashkent-6' were selected to study the relationships among their physiologic, metabolomic 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 height, the number of internodes, and sympodial branches in both cultivars. However, yield components such as the number of bolls, boll seed, lint mass, and individual plant yield were significantly reduced only in 'Tashkent-6'. The leaf area decreased and the specific leaf weight increased in 'Ishonch' under deficit irrigation conditions. However, 'Tashkent-6' demonstrated significant water loss compared to 'Ishonch', and both cultivars showed reduced transpiration rates. Untargeted metabolite profiles of leaves showed clear separation in 'Ishonch', but not in 'Tashkent-6' under deficit irrigation compared to full irrigation. The individual metabolites such as proline and galactinol showed strong association with yield under water deficit stress. Moreover, this study indicates that leaf area and transpiration intensity influence yield during water deficiency. In summary, the correlation among morpho-physiologic, metabolic, and yield components significantly varied between the two cultivars under water deficiency. The flowering stage was sensitive to water stress for both cultivars. The direct relationship between physiology, metabolism, and yield may be a useful selection criterion for determining candidate parents for cotton drought tolerance breeding.

Overexpression of ALDH21 from Syntrichia caninervis Moss in Upland Cotton Enhances Fiber Quality, Boll Component Traits, and Physiological Parameters during Deficit Irrigation

“…This can be explained by the amount of water used, which was 675 L water m −2 for full irrigation and 472 L m −2 for deficit irrigation in the field, and 566 (control) and 283 L m −2 (stress) in the managed treatment plots. It has been shown that cotton demonstrates yield reduction under water deficiency created either by drip or surface irrigation (Basal et al, 2009;Yang et al, 2015a;Bozorov et al, 2018). Moreover, yield changes in managed treatment plots were consistent with a recent study in which similar deficit surface irrigation was used with different cotton genotypes (Bozorov et al, 2018).…”

“…It has been shown that cotton demonstrates yield reduction under water deficiency created either by drip or surface irrigation (Basal et al, 2009;Yang et al, 2015a;Bozorov et al, 2018). Moreover, yield changes in managed treatment plots were consistent with a recent study in which similar deficit surface irrigation was used with different cotton genotypes (Bozorov et al, 2018). The improved tolerance and yield of transgenic cotton plants are perhaps a result of improved photosynthetic homeostasis, manifested as an increased number of fruiting branches and bolls ( Fig.…”

“…7). Moreover, yield changes in managed treatment plots were consistent with a recent study in which similar deficit surface irrigation was used with different cotton genotypes (Bozorov et al, 2018). It has been shown that cotton demonstrates yield reduction under water deficiency created either by drip or surface irrigation (Basal et al, 2009;Yang et al, 2015a;Bozorov et al, 2018).…”

“…7A), whereas in the field, 30% deficit irrigation did not significantly affect vegetative growth and cotton yields (Fig. It has been shown that cotton demonstrates yield reduction under water deficiency created either by drip or surface irrigation (Basal et al, 2009;Yang et al, 2015a;Bozorov et al, 2018). This can be explained by the amount of water used, which was 675 L water m −2 for full irrigation and 472 L m −2 for deficit irrigation in the field, and 566 (control) and 283 L m −2 (stress) in the managed treatment plots.…”

From qualitative to quantitative: a new approach for determining heat tolerance in cotton using triphenyl tetrazolium chloride

“…To identify heat tolerance, it is therefore important to ensure that variations in absorbance values from the HSA represent heat tolerance and resistance, and not water de ciencies, so plants should be kept well-watered. Finally, as responses to water stress vary among genotypes (39) and this study was only conducted in one genotype, further studies investigating the probable presence of genotype rank changes when samples are collected under water stress conditions should be conducted.…”