Plant Physiology Preview
Published on January 12, 2007; 10.1104/pp.106.091561
OPEN ACCESS ARTICLE
Received October 20, 2006
Accepted January 3, 2007
Auxin Biosynthesis by the YUCCA Genes in Rice
Yuko Yamamoto , Noriko Kamiya , Yoichi Morinaka , Makoto Matsuoka *, and Takashi Sazuka
Bioscience and Biotechnology Center, Nagoya University Chikusa, Nagoya Aichi, 464-8601, Japan
Although indole-3-acetic acid (IAA), the predominant auxin in plants, plays a critical role in various plant growth and developmental processes, its biosynthesis and regulation have not been clearly elucidated. To investigate the molecular mechanisms of IAA synthesis in rice, we identified seven YUCCA-like genes (named OsYUCCA1-7) in the rice genome. Plants overexpressing OsYUCCA1 exhibited increased IAA levels and characteristic auxin- overproduction phenotypes, whereas plants expressing antisense OsYUCCA1 cDNA displayed defects that are similar to those of rice auxin-insensitive mutants. OsYUCCA1 was expressed in almost all of the organs tested, but its expression was restricted to discrete areas including the tips of leaves, roots, and vascular tissues, where it overlapped with expression of a GUS reporter gene controlled by the auxin-responsive DR5 promoter. These observations are consistent with an important role for the rice enzyme OsYUCCA1 in IAA biosynthesis via the Tryptophan-dependent pathway.
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