Photosynthetica 2016, 54(4):630-635 | DOI: 10.1007/s11099-016-0217-7

Photosynthesis and yield traits in different soybean lines in response to salt stress

Y. He1, Y. Chen1, C. L. Yu1, K. X. Lu2, Q. S. Jiang1, J. L. Fu1, G. M. Wang3, D. A. Jiang1,*
1 State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, China
2 Laboratory of Plant Molecular Biology, Ningbo University, Ningbo, China
3 The Gulf of Hangzhou New District Management Committee, Ningbo, China

To evaluate utility of different salt-tolerant lines, three soybean lines with different resistance to salt were planted in the field under control and salt-stress conditions for two years. The results showed that net photosynthetic rate (P N) was significantly different among lines at the anthesis stage and decreased on average by 13.6-34.1% under conditions of salt stress. The stomatal conductance was a primary limiting factor for the reduction of P N under salt stress. Meanwhile, the grain yield (GY) decreased on average by 14.0-35.3% among lines under salt stress. The salt-tolerant lines S111-9 and S113-6 showed higher P N and GY under salt stress in comparison with the salt-sensitive cultivar Melrose. Regression analysis indicated that there was extremely significantly positive correlation between GY and P N under field conditions. Therefore, P N might be used as a physiological index for field resistance of soybean to salt stress.

Additional key words: chlorophyll fluorescence; cyclic electron flow; electron transport rate; nonphotochemical quenching; photochemical quenching; stomatal conductance

Received: March 23, 2015; Accepted: February 26, 2016; Published: December 1, 2016  Show citation

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He, Y., Chen, Y., Yu, C.L., Lu, K.X., Jiang, Q.S., Fu, J.L., Wang, G.M., & Jiang, D.A. (2016). Photosynthesis and yield traits in different soybean lines in response to salt stress. Photosynthetica, 54(4), 630-635. doi: 10.1007/s11099-016-0217-7
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