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Responses of rice leaf photosynthetic parameters to light intensity under NaCl s-tress

LI Haibo1,2,3;HEN Wenfu1;LI Quanying4   

  1. 1College of Agronomy,Shenyang Agricultural University,Shenyang 110161,China; 2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100039, China；4Institute of Rice Research, Liaoning Academy of Agricultural Science, Shenyang 110101, China

  • Received:2005-09-01 Revised:2006-07-14 Online:2006-09-18 Published:2006-09-18

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Abstract: With rice varieties salt-tolerant Liaoyan 2 and salt-sensitive Akihikari as test materials, this paper determined their leaf net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductivity (Gs), and intercellular CO2 concentr-ation (Ci) at different light intensities under long-term NaCl stress. The results showed that under NaCl stress, the Pn and Gs of the two varieties had an increase tendency with increasing light intensity, but in comparing with no NaCl stress, the Pn of Liaoyan 2 increased by 14.87%, while that of Akihikari decreased by 17.91%. The dynamic changes of Ci, Ls and Pn/Gs indicated that stomatal and non-stamatal factors played a positive role in the changes of Liaoyan 2 photosynthesis, while stomatal factor was the main reason inducing the changes of Akihikari photosynthesis.

Key words: Landscape ecology, Landscape structure, Greenland, Spatial pattern