RICE SCIENCE ›› 2007, Vol. 14 ›› Issue (4): 315-318 .

• Short Communication • Previous Articles    

Discussion on Photoreceptor for Negative Phototropism in Rice Roots

WANG Yue-xia 1, WANG Zhong 1, 2, SUO Biao 3, GU Yun-jie 1, 2, WANG Hui-hui 2, CHEN Yong-hui 2, DAI Yun-xia 2
  

  1. 1 Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China; 2 College of Biosciences and Biotechnology, Yangzhou University, Yangzhou 225009, China; 3 College of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101, China
  • Received:2007-06-25 Online:2007-12-28 Published:2007-12-28
  • Contact: WANG Zhong
  • Supported by:
    the National Natural Science Foundation of China (Grant No. 30270795), the open foundation of the State Key Laboratory of Plant Physiology and Biochemistry(Grant No. 2002001) and the Creative Plan of the Science andTechnology for Graduate Student in Institute of Jiangsu Province (Grant No. 200635).

Abstract: To properly explore the photoreceptor for the negative phototropism in rice (Oryza sativa L.) root, lights with different wavelengths were applied to investigate the effect of light quality on phototropic bending. The phototropic bending could be induced prominently by blue/ultraviolet light, whereas not by red or far-red light. The absorption spectrum of the extracted solution from rice root cap had two peaks at 350 nm and 450 nm, respectively, and the molecular weight of the 120 kD protein in the root cap under unilateral light was larger than that under the dark. It suggested that the blue light receptor might be the photoreceptor for the negative phototropism in rice root.

Key words: rice (Oryza sativa), root, negative phototropism, light quality, photoreceptor