期刊
PHOTOSYNTHETICA
卷 54, 期 1, 页码 120-129出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s11099-015-0171-9
关键词
chinese wingnut; gas exchange; pine; soil redox potential; stomatal limitation
资金
- International Cooperation Program of Ministry of Science and Technology [2015DFA90900, 2011DFG32780]
- Key Project of Chongqing Natural Science Foundation Program [CSTC-2013JJB00004]
- Basic Research Fund for Central Universities [XDJK2013A011]
- National Forestry Public Welfare Industry Research Special [201004039]
- Chongqing Natural Science Foundation Program [CSTC-2012jjA80003]
- Scientific Research Foundation for Returned Overseas Students [2010-1561]
To uncover adaptation capacities of two flooding-tolerant plant species, Pterocarya stenoptera (a native species) and Pinus elliottii (an exotic species from southeastern USA), to alternating submergence and drought, we investigated their physiological and growth responses to water stress. Water treatments, including control, continuous flooding (CF), and periodic flooding and drought (PF), were applied to seedlings in order to simulate water level fluctuation in the hydrofluctuation zone of the Three Gorges Reservoir Region. Results showed that net photosynthetic rate (P (N)), stomatal conductance, and intrinsic water-use efficiency of both plant species were negatively affected under CF and PF compared with the corresponding controls. The P (N) of both species under PF was comparable to that under CF. At the end of the experiment, the ratio of intercellular to ambient CO2 concentration was not statistically different between water treatments, while that of P. elliottii was significantly higher than that of P. stenoptera. Although P. stenoptera formed lenticels under flooding conditions, P. elliottii seedlings allocated more mass to leaves and increased the relative growth rate of height to enhance the photosynthetic efficiency. Our results illustrated that P. stenoptera and P. elliottii seedlings developed different adaptive strategies in response to flooding, both CF and PF. Therefore, both P. stenoptera and P. elliottii are promising candidates for the vegetation reconstruction of the riparian zones in the Three Gorges Reservoir Region.
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