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

• Z. Z. Xu ^[1] ; G. S. Zhou ^[2]
  1. [1] Graduate University of Chinese Academy of Sciences

     Graduate University of Chinese Academy of Sciences

     China

     
  2. [2] Institute of Atmospheric Environment, China Meteorological Administration
• Localización: Photosynthetica, ISSN 0300-3604, Vol. 43, Nº 1, 2005, págs. 29-35
• Idioma: inglés
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• Resumen

  • 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.