脱落酸
光合作用
蒸腾作用
叶绿素
气孔导度
过氧化氢酶
油菜素内酯
植物
耐旱性
园艺
化学
过氧化氢
抗氧化剂
相对增长率
丙二醛
过氧化物酶
生物
植物生长
增长率
酶
生物化学
基因
数学
几何学
作者
Yan Li,Hongxia Zhao,Baoli Duan,Helena Korpelainen,Chunyang Li
标识
DOI:10.1016/j.envexpbot.2010.11.005
摘要
We exposed seedlings of Cotinus coggygria var. cinerea to drought and exogenous abscisic acid (ABA) under two different light conditions. Two watering regimes (well-watered and drought), two exogenous ABA applications (no ABA and with ABA) and two light regimes (full sunlight and shade) were employed. Compared with well-watered treatment, drought treatment significantly reduced the relative growth rate, relative water content (RWC), net photosynthesis rate (A) and transpiration (E), but increased chlorophyll a (chla), carbon isotope (δ13C), endogenous ABA, malondialdehyde (MDA) and hydrogen peroxide (H2O2) contents, and guaiacol peroxidase (POD) and catalase (CAT) activities. There was an apparent alleviation of drought effects by shade, as indicated by the lower relative growth rate, and chlorophyll, MDA and H2O2 contents, and increases in indoleacetic acid (IAA) and reduced glutathione (GSH) contents. On the other hand, the exogenous ABA application under shade induced protective effects on drought-stressed seedlings, as visible in RWC, MDA, A, stomatal conductance (gs), E, δ13C, ABA and IAA values. In all, our results suggest that seedlings of C. coggygria are more sensitive to drought under full-light than under shade.
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