期刊
PHYSIOLOGIA PLANTARUM
卷 163, 期 1, 页码 45-58出版社
WILEY
DOI: 10.1111/ppl.12653
关键词
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资金
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT1247]
- National High Technology Research and Development Program of China [2014AA10A605]
- Program of Introducing Talents of Discipline to Universities in China [B14032]
- National Natural Science Foundation of China [31671620]
- Bill and Melinda Gates Foundation [OPP51587]
Salinity significantly limits leaf photosynthesis but the factors causing the limitation in salt-stressed leaves remain unclear. In the present work, photosynthetic and biochemical traits were investigated in four rice genotypes under two NaCl concentration (0 and 150mM) to assess the stomatal, mesophyll and biochemical contributions to reduced photosynthetic rate (A) in salt-stressed leaves. Our results indicated that salinity led to a decrease in A, leaf osmotic potential, electron transport rate and CO2 concentrations in the chloroplasts (C-c) of rice leaves. Decreased A in salt-stressed leaves was mainly attributable to low C-c, which was determined by stomatal and mesophyll conductance. The increased stomatal limitation was mainly related to the low leaf osmotic potential caused by soil salinity. However, the increased mesophyll limitation in salt-stressed leaves was related to both osmotic stress and ion stress. These findings highlight the importance of considering mesophyll conductance when developing salinity-tolerant rice cultivars.
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