Dwarf and short grain 1, encoding a putative U-box protein regulates cell division and elongation in rice

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• 作者：Nan Wang¹ ; Yadi Xing¹ ; Qijin Lou¹ ; Ping Feng ; Song Liu ; Meidan Zhu ; Wuzhong Yin ; Shunran Fang ; Yan Lin ; Tianquan Zhang ; Xianchun Sang ; Guanghua He ; ^{hegh@swu.edu.cn}
• 关键词：Brassinosteroid ; Multiple hormone pathways ; Cell division ; Cell elongation
• 刊名：Journal of Plant Physiology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：209
• 期：Complete
• 页码：84-94
• 全文大小：3444 K
• 卷排序：209

文摘

Plant hormones coordinate a plant’s responses to environmental stimuli and the endogenous developmental programs for cell division and elongation. Brassinosteroids are among the most important of these hormones in plant development. Recently, the ubiquitin-26S-proteasome system was identified to play a key role in hormone biology. In this study, we analyzed the function of a rice (Oryza sativa) gene, DSG1, which encodes a U-box E3 ubiquitin ligase. In the dsg1 mutant (an allelic mutant of tud1), the lengths of the roots, internodes, panicles, and seeds were shorter than that in the wild-type, which was due to defects in cell division and elongation. In addition, the leaves of the dsg1 mutant were wider and curled. The DSG1 protein is nuclear- and cytoplasm-localized and does not show tissue specificity in terms of its expression, which occurs in roots, culms, leaves, sheaths, and spikelets. The dsg1 mutant is less sensitive to brassinosteroid treatment than the wild-type, and DSG1 expression is negatively regulated by brassinosteroids, ethylene, auxin, and salicylic acid. These results demonstrate that DSG1 positively regulates cell division and elongation and may be involved in multiple hormone pathways.