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Published on June 20, 2008; 10.1104/pp.108.118679

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Received April 3, 2008
Accepted June 16, 2008

Developmental Role and Auxin Responsiveness of Class III HD-Zip Gene Family Members in Rice

Jun-Ichi Itoh , Ken-ichiro Hibara , Yutaka Sato , and Yasuo Nagato *

Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan; Department of Biological Mechanisms and Functions, Graduate School of Bioacricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

* Corresponding author; email: anagato{at}mail.ecc.u-tokyo.ac.jp.

Members of Class III homeodomain leucine zipper (Class III HD-Zip) gene family are central regulators of crucial aspects of plant development. To better understand the roles of five Class III HD-Zip genes in rice development, we investigated their expression patterns, ectopic expression phenotypes, and auxin responsiveness. Four genes, OSHB1–OSHB4, were expressed in a localized domain of the shoot apical meristem (SAM), the adaxial cells of leaf primordia, the leaf margins and the xylem tissue of vascular bundles. In contrast, expression of OSHB5 was observed only in phloem tissue. Plants ectopically expressing microRNA166-resistant versions of the OSHB3 exhibited severe defects, including the ectopic production of leaf margins, shoots, and radialized leaves. The treatment of seedlings with auxin quickly induced ectopic OSHB3 expression in the entire region of the SAM, but not in other tissues. Furthermore, this ectopic expression of OSHB3 was correlated with leaf initiation defects. Our findings suggest that rice Class III HD-Zip genes have conserved functions with their homologs in Arabidopsis, but have also acquired specific developmental roles in grasses or monocots. In addition, some Class III HD-Zip genes may regulate the leaf initiation process in the SAM in an auxin-dependent manner.




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