外源褪黑素对NaHCO_3胁迫下‘福客’葡萄根系和叶片生理特性的影响  

Effects of exogenous melatonin on physiological characteristics of ‘Frontenac’ grape roots and leaves under NaHCO_3 stress

作　　者：付晴晴[1] 耿庆伟[1] 翟衡[1] 杜远鹏[1] FU Qing-Qing GENG Qing-Wei ZHAI Heng DU Yuan-Peng(Key Laboratory of Biology and Genetic Improvement of Horticultural Crops in Huanghuai Region, Ministry of Agriculture, College of Horticulture Science and Engineering, Shandong Agricultural University / State Key Laboratory of Crop Biology, Tai＇an,Shandong 271018, China)

机构地区：[1]山东农业大学园艺科学与工程学院/作物生物学国家重点实验室农业部黄淮地区园艺作物生物学与种质创制重点实验室,山东泰安271018

出　　处：《植物生理学报》2017年第2期248-256,共9页Plant Physiology Journal

基　　金：国家现代葡萄产业技术体系建设专项(CARS-30);长江学者和创新团队发展计划项目(IRT15R42)~~

摘　　要：以一年生‘福客'盆栽葡萄苗为试材,研究不同浓度(0、100、300、500和700 nmol·L^(-1))外源褪黑素对碱胁迫(85mmol·L^(-1)NaHCO_3)下葡萄生理生化指标的影响。测定葡萄叶片叶绿素含量、叶绿素荧光和叶片电导率及丙二醛、根系活力和活性氧代谢指标。结果表明,100、300和500 nmol·L^(-1)外源褪黑素处理均缓解了NaHCO_3胁迫对葡萄叶片叶绿素的降解和光系统(PSII)活性的抑制,显著降低了根系O_2^-产生速率和H_2O_2含量,提高了植株根系活力,以300 nmol·L^(-1)外源褪黑素处理效果最明显。外源褪黑素处理能够清除NaHCO_3胁迫下葡萄根中过量活性氧的累积,维持膜系统的完整性,提高根系活力,缓解NaHCO_3胁迫对葡萄叶片叶绿素的降解以及PSII活性的抑制。One-year old potted ＇Frontenac＇ plants were used to study the effects of exogenous melatonin on physiological characteristics under NaHCO3 （85 mmol·L-1） stress. Chlorophyll content, PSII functions, electrolyte leakage and MDA content of grape leaves, activity of grape roots and active oxygen metabolism were tested. The results showed that 100, 300 and 500 nmol·L-1 exogenous melatonin increased the chlorophyll content, PSII functions and root activity, decreased H2O2 content and O2- production in root, and the effects of 300 nmol·L-1 exogenous melatonin was the best. Exogenous melatonin could scavenge active oxygen accumulation in roots to maintain the membrane integrity, promote root activity and mitigate chlorophyll decomposition under NaHCO3 treatment.

关 键 词：葡萄 外源褪黑素 NAHCO3胁迫 PSII活性 生理特性 

分 类 号：S663.1[农业科学—果树学]