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| Effects of Salicylic Acid on Photosynthesis Characteristics of Tomato Seedlings during NaCl Stress |
| YANG Feng-jun1，LI Tian-lai2*，SU Yue2，ZANG Zhong-jing1 |
| 1College of Agronomy，Heilongjiang Bayi Agricultural University，Daqing 163319，Heilongjiang，China；2College of Horticulture，Shenyang Agricultural University，Liaoning Province Key Laboratory of Protected Horticulture，Shenyang 110866，Liaoning，China |
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Abstract Effects of exogenous salicylic acid（SA）on photosynthesis and chlorophyll fluorescence in tomato（Lycopersicon esculentum Mill.）leaves under NaCl stress were studied．The results showed that under NaCl stress with SA treatment the levels of net photosynthetic rate（Pn）and stomatal conductance（Gs）increased more obviously than the control without SA，and the increasing or decreasing rate of intercellular CO2（Ci）concentration and stomatal limitation value（Ls）were faster than that of the control without SA too．The SA treatment inhibits the decreases of chlorophyll contents，intrinsic photochemical efficiency of PSⅡ（Fv/Fm），potential activity of PSⅡ（Fv/Fo），quantum yield of PSⅡ（ΦPSⅡ），chlorophyll photochemical quenching（qP）|and the increases in original fluorescence（Fo）and chlorophyll non-photochemical quenching（NPQ）．These results suggest that SA has protective role against the damage of photosynthetic system under NaCl stress．
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Received: 05 February 2012
Published: 22 April 2012
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