Growth, Gas Exchange, Abscisic Acid, and Calmodulin Response to Salt Stress in Three Poplars
Yu Chang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorCorresponding Author
Shao-Liang Chen
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
*Author for correspondence. Tel: +86 (0)10 6233 8129; Fax: +86 (0)10 6233 7855; E-mail: <[email protected]>.Search for more papers by this authorWei-Lun Yin
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorRui-Gang Wang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYan-Feng Liu
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYong Shi
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYuan-Yuan Shen
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYue Li
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorJie Jiang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYue Liu
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYu Chang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorCorresponding Author
Shao-Liang Chen
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
*Author for correspondence. Tel: +86 (0)10 6233 8129; Fax: +86 (0)10 6233 7855; E-mail: <[email protected]>.Search for more papers by this authorWei-Lun Yin
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorRui-Gang Wang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYan-Feng Liu
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYong Shi
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYuan-Yuan Shen
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYue Li
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorJie Jiang
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorYue Liu
College of Biological Science and Technology, Beijing Forestry University, Beijing 100083, China
Search for more papers by this authorSupported by the National Natural Science Foundation of China (30430430), the Foundation for the Author of National Excellent Doctoral Dissertation of China (200152), and the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institution of MOE, China (2002–323).
Abstract
In the present study, we investigated the effects of increasing salinity on growth, gas exchange, abscisic acid (ABA), calmodulin (CaM), and the relevance to salt tolerance in seedlings of Populus euphratica Oliv. and cuttings of P. “pupularis 35–44” (P. popularis) and P. x euramericana cv. I-214 (P. cv. Italica). The relative growth rates of shoot height (RGRH) for P. cv. Italica and P. popularis were severely reduced by increasing salt stress, whereas the growth reduction was relatively less in P. euphratica. Similarly, P. euphratica maintained higher net photosynthetic rates (Pn) and unit transpiration rates (TRN) than P. cv. Italica and P. popularis under conditions of higher salinity. Salinity caused a significant increase in leaf ABA and CaM in the three genotypes after the onset of stress, but NaCl-induced ABA and CaM accumulation was more pronounced in P. euphratica, suggesting that P. euphratica plants are more sensitive in sensing soil salinity than the other two poplars. Furthermore, P. euphratica maintained relatively higher ABA and CaM concentrations under conditions of high salinity. The higher capacity to synthesize stress signals, namely ABA and CaM, in P. euphratica and the contribution of this to the salt resistance of P. euphratica are discussed.
(Managing editor: Ping He)
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