期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 71, 期 1, 页码 107-113出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2010.11.005
关键词
Abscisic acid; Drought; Growth; Physiological traits; Shade
资金
- National Natural Science Foundation of China [30930075]
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.
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