生态学杂志2018，Vol.37Issue(2)：409-416,8.DOI:10.13292/j.1000-4890.201802.003
黄瓜花期高温胁迫对叶片衰老特性和内源激素的影响
Effects of high temperature stress on senescence and endogenous hormone of cucumber during flowering period
摘要
Abstract
To explore the effects of high temperature stress on the senescence characteristics and the dynamics of endogenous hormones in leaves of cucumber at flowering stage,we established an artificial environment within which temperature was controlled and selected cultivar'Nan Za Ⅱ'as experiment material.Four levels of daily/night temperature were treated as 42 ℃/32 ℃,39 ℃/29 ℃,36 ℃/26 ℃,and 24 ℃/18 ℃ (control);the durations of treatment time were 1,3,5,and 7 d,respectively.The contents of chlorophyll a,chlorophyll b,carotenoids and chlorophyll a+b,the activities of SOD,POD and CAT,and the content MDA,ABA,IAA,GA3 and ZT were measured.Treatment of 42 ℃/32 ℃ with a duration of 7 d significantly reduced the contents of leaf chlorophyll a,chlorophyll b,and carotenoids,the activities of POD and SOD,and the contents of IAA,GA3,and ZT by 16.61％,23.17％,73.33％,17.89％,56.90％,94.16％,54.32％,90.68％,respectively,but enhanced leaf MDA content (+62.66％),CAT activity (+28.06％),and ABA content (+294.35％) in apical bud.Our results showed that short-term high temperature stress increased the chlorophyll content of cucumber leaves and that the chlorophyll b content decreased gradually with the increase of temperature and extension of stress time.Short-term high temperature stress increased the activities of antioxidant enzymes in cucumber leaves,but decreased gradually with the increased intensity of high temperature stress.An increasing trend of ABA content in cucumber leaves was detected under high temperature stress,while the changes of IAA,GA3 and ZT contents showed an opposite trend.Results from this study provide scientific basis for temperature management of cucumber cultivation.关键词
黄瓜/高温胁迫/光合色素/抗氧化酶/内源激素Key words
cucumber/high temperature stress/photosynthetic pigments/antioxidase/endogenous hormone引用本文复制引用
薛思嘉,杨再强,朱丽云,李军..黄瓜花期高温胁迫对叶片衰老特性和内源激素的影响[J].生态学杂志,2018,37(2):409-416,8.基金项目
国家自然科学基金面上项目(41775104)和十二五”国家支撑计划项目(2014BAD10B07)资助. （41775104）
