Rice Science

RICE SCIENCE

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Photoinhibitive and Recovery Properties of Hybrid Rice Ⅱ You 129 under Field Conditions

XU Xiao-ming1; TANG Yun-lai2; WANG Ying1; LU Wei1; DAI TXin-bin1; ZHANG Rong-xian1; KUANG Ting-yun2   

  1. 1Agronomy Department, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

  • Received:2002-12-12 Revised:1900-01-01 Online:2003-10-18 Published:2003-10-18
  • Contact: ZHANG Rong-xian

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Abstract: Photoinhibitive properties of superhighyielding hybrid rice Ⅱ you 129 and its adaptation mechanism to strong light stress were investigated by measuring the lightresponse curve, diurnal variations of net photosynthetic rate and chlorophyll fluorescence parameters of Ⅱ you 129 leaves and compared with Shanyou 63. Photoinhibition of rice flag leaves under field conditions mainly resulted from the increase of thermal dissipation, especially for thermal dissipation depended on the xanthophyll circle, but no destruction of photosynthetic apparatus occurred. Potentially superhighyielding hybrid rice Ⅱ you 129 was more tolerant to photoinhibition than Shanyou 63, because it had higher light saturation intensity and maximum net photosynthetic rate; more active xanthophyll cycle, and more rapid recovery ability after photoinhibition.

Key words: rice, photoinhibition, chlorophyll fluorescence, xanthophyll cycle