外源水杨酸对干旱胁迫下猕猴桃砧木生理特性的影响  

Effects of Exogenous Salicylic Acid on the Physiological Traits of Kiwifruit Rootstocks under Drought Stress

作　　者：周康宇 何成勇 徐子鸿 李靖[1,2] 王玲利 刘普 涂美艳[1,2] ZHOU Kangyu;HE Chengyong;XU Zihong;LI Jing;WANG Lingli;LIU Pu;TU Meiyan(Institute of Horticulture,Sichuan Academy of Agricultural Sciences,Chengdu 610066,Sichuan,China;Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in Southwest China,Ministry of Agriculture and Rural Affairs,Chengdu 610066,Sichuan,China;School of Horticulture,Anhui Agricultural University,Hefei 230036,Anhui,China)

机构地区：[1]四川省农业科学院园艺研究所,四川成都610066 [2]农业农村部西南地区园艺作物生物学与种质创制重点实验室,四川成都610066 [3]安徽农业大学园艺学院,安徽合肥230036

出　　处：《西昌学院学报(自然科学版)》2024年第4期20-25,31,共7页Journal of Xichang University(Natural Science Edition)

基　　金：四川省科技计划项目(2022YFYZ0003);国家现代农业产业技术体系四川创新团队(SCCXTD-2024-4);国家柑橘产业技术体系猕猴桃成都综合试验站(CARS-26)。

摘　　要：[目的]探究外源水杨酸对干旱胁迫下猕猴桃砧木生理特性的影响,为抗旱调节物质的应用提供理论依据。[方法]采用盆栽试验,以‘Bruno’猕猴桃为材料,外源水杨酸预处理后采用25%的聚乙二醇6000(PEG-6000)溶液模拟干旱胁迫,于干旱胁迫后不同时间测定‘Bruno’猕猴桃叶片生理指标的变化。[结果]1、2、4 mmol/L水杨酸溶液处理下,猕猴桃在干旱胁迫下叶片中丙二醛(MDA)和过氧化氢(H2O2)质量分数上升幅度显著降低,而脯氨酸(Pro)质量分数、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性上升幅度显著升高。其中,2 mmol/L水杨酸溶液处理抗旱效果最明显。[结论]外源水杨酸处理降低了膜脂过氧化程度,增加了渗透调节物质的积累和抗氧化酶活性,从而提高了猕猴桃抗旱性。[Objective]To explore the effects of exogenous salicylic acid on the physiological traits of kiwifruit rootstocks under drought stress and provide a theoretical basis for the application of drought-resistant regulatory substances.[Method]A pot experiment was carried out using'Bruno'kiwifruit as the material,after pretreatment with exogenous salicylic acid,25%polyethylene glycol 6000(PEG-6000)solution was used to simulate drought stress.The changes in the physiological indexes of the leaves of'Bruno'kiwifruit were measured at different times after drought stress.[Result]Under the treatments with 1,2 and 4 mmol/L salicylic acid solutions,the increase ranges of the mass fractions of malondialdehyde(MDA)and hydrogen peroxide(H2O2)in the kiwifruit leaves under drought stress were significantly reduced,while the increase ranges of the mass fraction of proline(Pro),the activities of superoxide dismutase(SOD)and catalase(CAT)were significantly increased.Among them,the treatment with 2 mmol/L salicylic acid solution had the most obvious drought-resistant effect.[Conclusion]The exogenous salicylic acid treatment reduced the degree of membrane lipid peroxidation,enhanced the accumulation of osmoregulatory substances and increased the activities of antioxidant enzymes,thus improving the drought resistance of kiwifruit plants.

关 键 词：猕猴桃砧木 水杨酸 干旱胁迫 抗氧化能力 

分 类 号：S663.4[农业科学—果树学]