Plant Physiology Preview
Published on March 9, 2007; 10.1104/pp.107.095737
Received January 10, 2007
Accepted March 1, 2007
A Wuschel-like Homeobox Gene Represses a Yabby Gene Expression Required for Rice Leaf Development
Mingqiu Dai , Yongfeng Hu , Yu Zhao , Huifang Liu , and Dao-Xiu Zhou *
National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China; Institut de Biotechnologie des Plantes, Université Paris sud XI, 91405 Orsay, France
* Corresponding author; email: dao-xiu.zhou{at}u-psud.fr.
YABBY and WUSCHEL-LIKE HOMEOBOX (WOX) genes have been shown to play important roles in lateral organ formation and meristem function. Here, we report the characterization of functional relationship between rice YAB3 and WOX3 in rice leaf development. Rice YAB3 is closely related to maize ZmYAB14 and Arabidopsis FILAMENTOUS FLOWER (FIL), whereas rice WOX3 is highly conserved with maize narrow sheath 1/2 (NS1/2) and Arabidopsis PRESSED FLOWER (PRS). In situ hybridization experiments revealed that the expression of both genes was excluded from the shoot apical meristem (SAM), but the transcripts were detected in leaf primordial, young leaves and reproductive organs without any polar distribution. The function of the two genes was studied by both over-expression and RNA interference (RNAi) in transgenic rice. YAB3 RNAi induced twisted and knotted leaves lacking specialized structures such as ligule and auricles, while no phenotypic change was observed in YAB3 over-expression plants, suggesting that rice YAB3 may be required for leaf cell growth and differentiation. Over-expression of WOX3 repressed YAB3 and showed a YAB3 RNAi phenotype. The expression of class I KNOTTED LIKE HOMEOBOX (KNOX) genes was ectopically induced in leaves of YAB3 RNAi or WOX3 over-expression plants. Data from inducible WOX3 expression and DNA-protein interaction assays suggested that WOX3 acted as a transcriptional repressor of YAB3. These data reveal a regulatory network involving YAB3, WOX3 and KNOX genes required for rice leaf development.
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