【摘 要】
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Background: Today, stress moderators are employed to mitigate crop loss due to the adverse effects of environmen-tal stress. The current research aimed to investigate the impacts of time and stress moderator types on agro-physio-logical responses of cotto
【机 构】
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Department of Agronomy and Plant Breeding,Sabzevar Branch,Islamic Azad University,Sabzevar,Iran
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Background: Today, stress moderators are employed to mitigate crop loss due to the adverse effects of environmen-tal stress. The current research aimed to investigate the impacts of time and stress moderator types on agro-physio-logical responses of cotton on conventional and double-cropping systems during 2017 and 2018 under saline condi-tions. A split-plot factorial experiment was carried out in a randomized complete block design with three replications. Cultivation system [conventional (recommended planting date) and double-cropping systems (sowing after harvest of wheat)] were considered as the main plots, and stress moderator type at four levels [water control, 2 mmol·L–1 Salicylic acid (SA), 100 mmol·L–1 Glycine betaine (GB), and 100 μmol·L–1 sodium nitroprusside (SNP)] and application time (flowering and flowering + bolling stages) were regarded as subplots. Results: Plant height, reproductive branch number, the number of bolls, 10-boll weight, 1000-seed weight, biologi-cal yield, seed cotton yield, lint yield, chlorophyll a, chlorophyll b, carotenoids, total chlorophyll, sodium, potassium, and proline content were less in double-cropping system comparing with conventional system. Spraying with the stress moderators alleviated soil salinity effects on yield, yield components, and biochemical traits of cotton. SNP spraying led to maximum plant height, branch number, the number of bolls per plant, 10-boll weight and seed cotton yield. SA spraying yielded the highest 1000-seed weight, biological yield, lint percentage and lint yield. The highest chlorophyll a, chlorophyll b, carotenoids, and total chlorophyll content resulted from SNP spraying. Yield, yield components, and biochemical traits did not respond to the stress moderator types in double-cropping system. However, the highest chlorophyll a, carotenoids, proline content, the number of bolls per plant, and seed cotton yield resulted from SNP spraying in conventional system. No statistically significant differences were observed between spraying with SNP and SA in most studied traits. Conclusions: The results suggest that the optimum cotton planting time and SNP spraying could be recommended for producing the most suitable yield under saline conditions.
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