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Acta Agron Sin ›› 2007, Vol. 33 ›› Issue (08): 1385-1389.

• RESEARCH NOTES • Previous Articles     Next Articles

Effects of Phosphorus Nutrient on the Photosynthetic Characteristics in Rice Cultivars with Different Cold-Sensitivity

WANG Guo-Li12,GUO Zhen-Fei1*   

  1. 1 College of Life Science, South China Agricultural University, Guangzhou 510642, Guangdong；2 Department of Life Science, Huizhou College, Huizhou 516007, Guangdong, China
  • Received:2006-10-23 Revised:1900-01-01 Online:2007-08-12 Published:2007-08-12
  • Contact: GUO Zhen-Fei

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Abstract:

The experiment was conducted under low temperature using two rice cultivars with different cold sensitivities grown in cultured solution with different phosphorus concentrations. The result showed that chlorophyll content, photosynthetic rate, Fv/Fm and qp were decreased in the two rice cultivars under chilling stress, and they were decreased more in chilling sensitive cultivar than in chilling tolerant cultivar. The seedlings cultured in higher level of phosphorus nutrient had higher levels of chlorophyll, photosynthetic rate, Fv/Fm and qp. Phosphorus deficiency reduced the chlorophyll content, photosynthetic rate, Fv/Fm and qp. NPQ under chilling stress and phosphorus deficiency was increased in chilling tolerant cultivar, but not changed much in the chilling sensitive cultivar. The results indicated that photosynthesis and the chilling resistance of rice can be improved by exogenous application of phosphorus. Phosphorus nutrition status had a more significant effect on the photosynthesis in chilling-sensitive cultivar than in chilling-tolerant cultivar.

Key words: Phosphorus nutrition, Rice, Chilling, Photosynthetic characteristics

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