Comparative analysis of physiological and biochemical characteristics of cold tolerance of cotton seedlings coated with 7.2％carboxin and 40％amicarthiazol
[Objective]To compare the effects of two fungicides with similar active structure,namely,car-boxin and amicarthiazol,on improving the ability of cotton seeds to withstand low temperature and cold dam-age,the difference between the two fungicides in improving the ability of cotton seeds to withstand low tempera-ture and cold damage was analyzed,their physiological mechanism exploreed was preliminarily,and a theoreti-cal basis for developing new products that can improve the ability of cotton to withstand low temperature and cold damage was provided.[Methods]The main cultivars of Xinlu Zao 50 cotton species in the cotton area of northern Xinjiang were used as experimental materials,and the basic seed coating agent coated cotton seeds were used as the control,and the seed coating agent of 7.2％carboxin and 40％amicarthiazol were added to the basic seed coating agent,respectively,and the low temperature stress treatment was carried out by artificial simulation of low temperature environment(4℃/16℃),and the physiological response of each coating treat-ment to cotton germination,seedling growth and cold tolerance under low temperature conditions was observed.[Results]Compared with the control,the germination potential of the coating treatment of carboxin and ami-carthiazol was increased by 9.67％and 5.33％,respectively.The germination index was increased by 12.00％and 6.00％,the vitality index was increased by 13.33％and 6.67％,the relative conductivity(REC)was increased by-12.5％and-3.75％,the soluble protein(SP)content was increased by 11.00％and 6.00％,the superoxide dismutase(SOD)activity was increased by 10.67％and 6.67％,and the chilling injury index(CI)was decreased by-10.67％and-5.33％,respectively,and the differences were significant.The correlation analysis showed that the CI of cotton seedlings was significantly correlated with REC,SP,SOD and other indicators.Principal component analysis showed that the ability of cotton seedlings to adapt to cold stress was improved by the coating treatment of carboxin,which was better than that of amicarthiazol.[Conclusion]Under low temperature stress,the coating treatment of both carboxin and amicarthiazol has a certain impact on cotton seed germination and seedling physiological characteristics,can promote the transformation and synthesis of nutrients in the seeds during germination,improve seed activity,so as to improve seed germination rate.By inducing the activity of enzymes in cotton seedling cells to increase,eliminate active oxygen free radicals in the seedlings,and accelerate the accumulation of MDA content,It can protect the stability of cell membrane struc-ture of cotton seedlings,so as to improve the cold tolerance of cotton seedlings.Among the two agents,the effect of carboxin seed coating agent on inducing cold resistance of cotton seedlings is better than that of ami-carthiazol,which can further strengthen product development and large-scale application.
carboxinamicarthiazolcottonlow temperature stressphysiological and biochemical characteristics
周小云、雷斌、张军高、梁晶、龚静云、周广威、张少民、李进
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新疆农业科学院核技术生物技术研究所/新疆作物化学调控工程技术研究中心,乌鲁木齐 830091
萎锈灵 拌种灵 棉花 冷胁迫 生理生化特征
新疆维吾尔自治区重点实验室开放课题项目国家自然科学基金项目新疆维吾尔自治区重点研发项目"一带一路"农药研发基地建设项目新疆"天山英才"培养计划"三农"骨干人才项目Xinjiang"Tianshan Talents"Training Program"Three Rural"Back bone Talent Project
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