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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (8): 1558-1561.doi: 10.3724/SP.J.1006.2009.01558

• RESEARCH NOTES • Previous Articles     Next Articles

Relationship between cpt1 Gene and the Negative Phototropism in Rice Roots

WANG Yue-Xia12,WANG Zhong2*,LIU Quan-Jun1,ZHAO Hui-Jie1,GU Yun-Jie2,YUAN Zhi-Liang1   

  1. 1Coolege of Life Sciences,Henan Agricultural University,Zhengzhou 450002,China;2College of Biosciences and Biotechnology,Yangzhou University Yangzhou 225009,China
  • Received:2008-11-15 Revised:2009-02-17 Online:2009-08-12 Published:2009-06-11
  • Contact: WANG Zhong, E-mail: wangzhong@yzu.edu.cn

Abstract:

With the purpose of studying the relationship between cpt1 gene and negative phototropism in rice roots, discussing the contribution of asymmetric distribution of IAA on negative phototropism in rice roots, CaCl2, EDTA and IAA were assayed for their effects on the negative phototropism in rice roots, as well as effects on the expression of cpt1 gene on the basis of reverse transcription-PCR. The result showed that, the negative phototropism in rice roots was improved by the treatment with 1 mg L-1 CaCl2 and 0.001 mg L-1 IAA in culture solution under light for 24 h but constrained by 1 mg L-1 EDTA. A similar effect was shown from the analysis of cpt1 gene expression, which suggested CPT1 protein could be induced by CaCl2 and IAA. The effects also showed a positive correlation between the expression of cpt1 and negative phototropism in rice roots. It could be supposed from present results that the asymmetric distribution of IAA is an important step for the negative phototropism process in rice roots, which probably is particularly associated with CPT1 protein as a carrier of IAA.

Key words: Rice, Root, Negative phototropism, IAA carrier protein, cpt1 gene

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