Analysis of the Elongated Hypocotyl and Petiole Phenotype in ZIM-Overexpressing Arabidopsis

Shikata Masahito, Matsuda Yuko, Ando Kohei, Takamura Miho, Yokota Akiho, Kohchi Takayuki

doi:10.14841/jspp.2003.0.336.0

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シロイヌナズナZIM遺伝子過剰発現体における胚軸および葉柄の伸長表現型の解析

Abstract

ZIM is a putative transcription factor in Arabidopsis with zinc-finger and CCT motifs. ZIM mRNA was detected from the vegetative phase and was more abundant in apices than leaves. To elucidate ZIM function, ZIM-overexpressing transgenic plants (ZIM-ox) were generated. In ZIM-ox, hypocotyls and petioles were elongated due to increased cell elongation. Competence in cell elongation was not affected, since ZIM-ox hypocotyls were as long as wild-type in the dark. The hypocotyl elongation phenotype was also observed in red, far-red, and blue light. This indicated that ZIM functioned as a negative regulator in the signal transduction pathway after convergence of photoreceptor-mediated light signals. The hypocotyl and petiole elongation in ZIM-ox was inhibited by brassinazole, a brassinosteroid biosynthesis inhibitor, which indicated that the elongation required brassinosteroids. These results suggest that ZIM is a regulator of photomorphogenesis via brassinosteroids. We are analyzing microarray data from ZIM-ox to identify genes responsible for elongation.

Journal

Plant and Cell Physiology Supplement

Plant and Cell Physiology Supplement 2003 (0), 336-336, 2003

The Japanese Society of Plant Physiologists

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CRID: 1390001205629397632

NII Article ID: 130006989829

DOI: 10.14841/jspp.2003.0.336.0

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Analysis of the Elongated Hypocotyl and Petiole Phenotype in <I>ZIM</I>-Overexpressing <I>Arabidopsis</I>

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