Effect of drought and ABA on growth, photosynthesis and antioxidant system of Cotinus coggygria seedlings under two different light conditions
Effect of drought and ABA on growth, photosynthesis and antioxidant system of Cotinus coggygria seedlings under two different light conditions
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两种不同光照条件下干旱和ABA对黄栌幼苗生长、光合作用及抗氧化系统的影响
DOI：
10.1016/j.envexpbot.2010.11.005
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发表时间：
2011-04-01
影响因子：
5.7
通讯作者：
Li, Chunyang
中科院分区：
文献类型：
--
作者：
Li, Yan;Zhao, Hongxia;Li, Chunyang
在两种不同的光照条件下，对Cotinus coggygria var. cinerea幼苗分别进行了干旱和外源ABA的处理。采用了两种浇水模式（丰水模式和干旱模式）、两种外源ABA应用模式（无ABA和有ABA）和两种光照模式（全光照和全遮荫模式）。与水分充足处理相比，干旱处理显著降低了相对生长率、相对含水量（RWC）、净光合速率(A)和蒸腾速率(E)，但提高了叶绿素A （chla）、碳同位素（δ C-13）、内源ABA、丙二醛（MDA）和过氧化氢（H2O2）含量以及愈创木酚过氧化物酶（POD）和过氧化氢酶（CAT）活性。遮荫明显减轻了干旱的影响，表现为相对生长率降低，叶绿素、MDA和H2O2含量降低，吲哚乙酸（IAA）和还原性谷胱甘肽（GSH）含量增加。另一方面，遮荫条件下外源ABA对干旱胁迫幼苗的保护作用体现在RWC、MDA、A、气孔导度（g(s)）、E、δ C-13、ABA和IAA值上。综上所述，我们的研究结果表明，在光照充足的情况下，金银花幼苗对干旱的敏感性高于遮荫条件。(C) 2010 Elsevier B.V.版权所有
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 (delta C-13), 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 (g(s)), E, delta C-13, 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. (C) 2010 Elsevier B.V. All rights reserved.