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Plant Physiol, October 1999, Vol. 121, pp. 373-382

Cloning and Molecular Analyses of a Gibberellin 20-Oxidase Gene Expressed Specifically in Developing Seeds of Watermelon1

Hong-Gyu Kang, Sung-Hoon Jun, Junyul Kim, Hiroshi Kawaide, Yuji Kamiya, and Gynheung An*

Department of Life Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea (H.-G.K., S.-H.J., J.K., G.A.); and Frontier Research Program, The Institute of Physical and Chemical Research (RIKEN), Wako-Shi, Saitama 351-0198, Japan (H.K., Y.K.)

To understand the biosynthesis and functional role of gibberellins (GAs) in developing seeds, we isolated Cv20ox, a cDNA clone from watermelon (Citrullus lanatus) that shows significant amino acid homology with GA 20-oxidases. The complementary DNA clone was expressed in Escherichia coli as a fusion protein, which oxidized GA12 at C-20 to the C19 compound GA9, a precursor of bioactive GAs. RNA-blot analysis showed that the Cv20ox gene was expressed specifically in developing seeds. The gene was strongly expressed in the integument tissues, and it was also expressed weakly in inner seed tissues. In parthenocarpic fruits induced by 1-(2-chloro-4-pyridyl)-3-phenylurea treatment, the expression pattern of Cv20ox did not change, indicating that the GA 20-oxidase gene is expressed primarily in the maternal cells of developing seeds. The promoter of Cv20ox was isolated and fused to the beta -glucuronidase (GUS) gene. In a transient expression system, beta -glucuronidase staining was detectable only in the integument tissues of developing watermelon seeds.

1 This work was funded in part by a grant from a special grant research program of the Ministry of Agriculture, Forestry and Fishery of Korea.

* Corresponding author; e-mail genean{at}postech.ac.kr; fax 82-562-279-2199.

© 1999 American Society of Plant Physiologists


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