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Plant and Cell Physiology, 2003, Vol. 44, No. 10 1071-1080
© 2003 Oxford University Press

DFL2, a New Member of the Arabidopsis GH3 Gene Family, is Involved in Red Light-Specific Hypocotyl Elongation

Tomoyuki Takase1,2, Miki Nakazawa2, Akie Ishikawa2, Katsushi Manabe1 and Minami Matsui2,3

1 Graduate School of Integrated Science, Yokohama City University 22-2 Seto, Kanazawaku, Yokohama, 236-0027 Japan
2 Plant Function Exploration Team Plant Functional Genomics Group, Genomic Sciences Center RIKEN Yokohama Institute, 1-7-22 Suehirocho, Tsurumiku, Yokohama, 230-0045 Japan

A new GH3-related gene, designated DFL2, causes a short hypocotyl phenotype when overexpressed under red and blue light and a long hypocotyl when antisensed under red light conditions. Higher expression of this gene was observed in continuous white, blue and far-red light but the expression level was low in red light and darkness. DFL2 gene expression was induced transiently with red light pulse treatment. DFL2 transgenic plants exhibited a normal root phenotype including primary root elongation and lateral root formation, although primary root elongation was inhibited in antisense transgenic plants only under red light. The adult phenotypes of sense and antisense transgenic plants were not different from that of wild type. DFL2 promoter activity was observed in the hypocotyl. Our results suggest that DFL2 is located downstream of red light signal transduction and determines the degree of hypocotyl elongation.

3 Corresponding author: E-mail: minami{at}postman.riken.go.jp; Fax, +81-45-503-9586.


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