Photosynthetica, 2014 (vol. 52), issue 2

Photosynthetica 2014, 52(2):313-320 | DOI: 10.1007/s11099-014-0032-y

Effects of NaCl stress on the growth and photosynthetic characteristics of Ulmus pumila L. seedlings in sand culture

Z. T. Feng1, Y. Q. Deng1, H. Fan1, Q. J. Sun1, N. Sui1, B. S. Wang1,*
1 Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, China

The effects of NaCl stress on the growth and photosynthetic characters of Ulmus pumila L. seedlings were investigated under sand culture condition. With increasing NaCl concentration, main stem height, branch number, leaf number, and leaf area declined, while Na+ content and the Na+/K+ ratio in both expanded and expanding leaves increased. Na+ content was significantly higher in expanded leaves than in those just expanding. Chlorophyll (Chl) a and Chl b contents declined as NaCl concentration increased. The net photosynthetic rate, intercellular CO2 concentration, stomatal conductance, and transpiration rate also declined, but stomatal limitation value increased as NaCl concentration increased. Both the maximal quantum yield of PSII photochemistry and the effective quantum yield of PSII photochemistry declined as NaCl concentration rose. These results suggest that the accumulation of Na+ in already expanded leaves might reduce damage to the expanding leaves and help U. pumila endure high salinity. The reduced photosynthesis in response to salt stress was mainly caused by stomatal limitation.

Keywords: chlorophyll fluorescence; elm; gas exchange; growth; salt stress; sodium ion

Received: June 25, 2013; Accepted: October 1, 2013; Published: June 1, 2014Show citation

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Feng, Z.T., Deng, Y.Q., Fan, H., Sun, Q.J., Sui, N., & Wang, B.S. (2014). Effects of NaCl stress on the growth and photosynthetic characteristics of Ulmus pumila L. seedlings in sand culture. Photosynthetica, 52(2), 313-320. doi: 10.1007/s11099-014-0032-y.
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