棉花学报2023，Vol.35Issue(5)：365-377,13.DOI:10.11963/cs20230017
外源茉莉酸甲酯对花铃期棉花耐高温能力的影响
Effects of exogenous methyl jasmonate on cotton tolerance to heat stress during flowering and boll-setting stage
摘要
Abstract
[Objective]This study aims to explore the effects of exogenous methyl jasmonate(MeJA)on cotton tolerance to the heat stress.[Method]The self-bred line ZS08 was used as the test material.Distilled water(CK)and MeJA with different concentrations(200 μmol·L-1,400μmol·L-1and 600 μmol·L-1)were used on plants at the flowering and boll-setting stage.And after the artificial heat stress of 38.0 ℃/30.0 ℃(day/night)for three days or under natural heat stress of 35.2-37.5 ℃/26.4-27.2 ℃(day/night)for ten days,the pollen viability,photosynthetic characteristics,antioxidant enzyme activity,malondialdehyde(MDA)content,yield and fiber quality of each treatment were measured.[Result]The pollen viability was reduced under the artificial heat stress.The MeJA treatment of three concentrations all had alleviated the inhibition of heat stress on pollen viability compared with the water control.The net photosynthetic rate(Pn),transpiration rate(Tr)and stomatal conductance(Gs)of the fourth leaf from top of the main stem in the 400 μmol·L-1 and 600 μmol·L1 MeJA treated plants were increased in various degree than those of the control under 2-3 days heat stress by 1.6％-3.7％,7.2％-15.7％,and 44.4％-53.4％,respectively.The activity of superoxide dismutase(SOD)and peroxidase(POD)of the second leaf from top on the main stem in 400μmol·L-1 and 600 μmol·L-1 MeJA treatment were increased by 3.1％-7.2％and 5.7％-20.0％than those of the control under 2-3 days heat stress.While the content of MDA was reduced by 10.9％-17.9％.Under the natural heat stress,plants which were treated by different concentrations of MeJA had improved boll-setting rate and boll weight in varying degree,and had significantly improved lint yield by 9.0％-18.3％compared with the control.[Conclusion]When encountering heat stress during the flowering and boll-setting stage,the application of MeJA can increase Pn and the activities of SOD and POD,reduce the degree of leaf damage,and improve pollen viability,thereby enhance the heat tolerance of cotton,and reduce the impact of heat stress on boll-setting rate,boll weight,and yield loss.关键词
棉花/高温胁迫/茉莉酸甲酯/花铃期/产量/纤维品质Key words
cotton/heat stress/methyl jasmonate/flowering and boll-setting stage/yield/fiber quality引用本文复制引用
谢贤运,冯常辉,王孝刚,夏松波,张教海,张友昌,王琼珊,秦鸿德,别墅..外源茉莉酸甲酯对花铃期棉花耐高温能力的影响[J].棉花学报,2023,35(5):365-377,13.基金项目
国家重点研发计划(2020YFD1001002) （2020YFD1001002）
