Photosynthetica 2005, 43(1):29-35 | DOI: 10.1007/s11099-005-0035-9

Effects of water stress on photosynthesis and nitrogen metabolism in vegetative and reproductive shoots of Leymus chinensis

Z. Z. Xu1, G. S. Zhou2,*
1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
2 Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, China

In Leymus chinensis, mild water stress (soil moisture 60-65 % of field capacity) had no significant effects on nitrogen metabolism, photosynthesis, and chlorophyll fluorescence. Severe water stress (35-40 %) significantly decreased the activities of nitrate reductase, glutamine synthetase, and glutamate dehydrogenase, net photosynthetic rate, stomatal conductance, transpiration rate, maximal efficiency of photosystem 2 photochemistry (Fv/Fm), actual quantum yield, and photochemical quenching, but increased the endopeptidase activity and malondialdehyde contents. The adverse effects on photosynthesis and N metabolism were markedly greater in reproductive shoots than in vegetative shoots.

Additional key words: chlorophyll fluorescence; endopeptidase; glutamate dehydrogenase; glutamine synthetase; lipid peroxidation; nitrate reductase; soil moisture

Received: April 5, 2004; Accepted: October 21, 2004; Published: March 1, 2005  Show citation

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Xu, Z.Z., & Zhou, G.S. (2005). Effects of water stress on photosynthesis and nitrogen metabolism in vegetative and reproductive shoots of Leymus chinensis. Photosynthetica, 43(1), 29-35. doi: 10.1007/s11099-005-0035-9
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