Abstract
Key enzyme activities related to nitrogen metabolism, gas-exchange, chlorophyll fluorescence, and lipid peroxidation were determined in Leymus chinensis (Trin.) Tzvel. plants under four soil moisture regimes (control: 75%–80% of field moisture capacity, mild drought: 60%–65%, and moderate drought: 50%–55% as well as severe drought: 35%–40%). Severe drought significantly decreased the key enzyme activities of nitrogen anabolism such as nitrate reductase (NR, EC 1.6.6.1), glutamine synthetase (GS, EC 6.3.1.2), and glutamate dehydrogenase (GDH, EC 1.4.1.2) but increased the key enzyme activities of nitrogen catabolism such as asparaginase (AS, EC 6.3.5.4) and endopeptidase (EP, EC 3.4.24.11), especially after long-term soil drought. Plant biomass, leaf-biomass ratio between the green leaf and total plant biomass, net photosynthetic rate, stomatal conductance, the maximal efficiency of PSII photochemistry, the actual quantum yield, and the photochemical quenching were significantly reduced by severe water stress. Plant malondialdehyde (MDA) concentration increased with the increase in water stress, particularly at the late-growth stage. Our results suggest that the key enzymes of nitrogen metabolism may play an important role in the photosynthetic acclimation of L. chinensis plants to long-term soil drought.







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Acknowledgments
This study was financed by the National Natural Science Foundation of China (grant 30470338, 40231018) and the Key Project of Chinese Academy of Sciences (grant KSCX2-SW-133). We thank Bing-Rui Jia, Yan-Ling Jiang, Jian Song, Feng-Yu Wang, Yu-Hui Wang, Yun-Long Wang, and Wen-Ping Yuan for their assistance during the experiment. We also gratefully acknowledge the reviewers’ constructive comments.
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Xu, Z.Z., Zhou, G.S. Nitrogen Metabolism and Photosynthesis in Leymus chinensis in Response to Long-term Soil Drought. J Plant Growth Regul 25, 252–266 (2006). https://doi.org/10.1007/s00344-006-0043-4
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DOI: https://doi.org/10.1007/s00344-006-0043-4