CND41, a chloroplast nucleoid protein that regulates plastid development, causes reduced gibberellin content and dwarfism in tobacco |
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| Authors: | Takeshi Nakano Noriko Nagata Takuma Kimura Masayo Sekimoto Hiroshi Kawaide Shinya Murakami Yasuko Kaneko Hisashi Matsushima Yuji Kamiya Fumihiko Sato Shigeo Yoshida |
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| Affiliation: | Plant Functions Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan;Department of Applied Life Sciences, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan;RIKEN Plant Science Centre, 2-1 Hirosawa, Wako 351-0198, Japan;Department of Regulation-Biology, Saitama University, 225 Shimobukuro, Urawa 338, Japan |
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| Abstract: | CND41, a DNA binding protein of chloroplast nucleoids, may function as a negative regulator of chloroplast gene expression. The reduction of CND41 in an antisense transformant accelerated plastid development in shoot apex cells and early young leaves, and caused a dwarf phenotype and altered leaf morphology. Plant height and leaf shape could be restored almost to those of the wild type by application of gibberellins (GAs), clearly indicating that a reduction in GA content was a prime cause of the dwarf phenotype in CND41 antisense transformants. The transformants had reduced endogenous levels of active gibberellin (GA1), a biologically active GA, compared to those of wild-type plants. Possible relationships between chloroplast development affected by CND41 function and GA biosynthesis are discussed. |
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