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Overexpression of OsPIL15, a phytochrome-interacting factor-like protein gene, represses etiolated seedling growth in rice

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Journal of Integrative Plant Biology 2014年第4期56卷 373-387页

作者： Jinjun Zhou Qianqian Liu Fang Zhang Yingying Wang Shiyong Zhang Huimin Cheng Lihua Yan Li Li Fan Chen Xianzhi Xie Shandong Rice Research Institute Shandong Academy of Agricultural Sciences Shandong Provincial Key Laboratory of Crop Genetic Improvement Ecology and Physiology College of Life Sciences Shandong Normal University Institute of Genetics and Developmental Biology the Chinese Academy of Sciences

phytochrome-interacting factors （PIFs） regulate an array of developmental responses ranging from seed germi- nation to vegetational architecture in Arabidopsis. However, information regarding the functions of the PIF family in monocots has not been widely reported. Here, we investigate the roles of OsPIL15, a member of the rice （Oryza sativa L. cv. Nipponbare） PIF family, in regulating seedling growth. OsPIL15 encodes a basic helix-loop-helix factor localized in the nucleus. OsPIL15-OX seedlings exhibit an exaggerated shorter above- ground part and undeveloped root system relative to wild-type seedlings, suggesting that OsPIL15 represses seedling growth in the dark. Microarray analysis combined with gene ontology analysis revealed that OsPIL15 represses a set of genes involved in auxin pathways and cell wall organization or biogenesis. Given the important roles of the auxin pathway and cell wall properties in controlling plant growth, we speculate that OsPIL15 represses seedling growth likely by regulating the auxin pathway and suppressing cell wall organization in etiolated rice seedlings. Additionally, exposure to red light or far-red light relieved growth retardation and promoted seedling elongation in the OsPIL15-OX lines, despite higher levels of OsPIL15 transcripts under red light and far-red light than in the dark. These results suggest that light regulation of OsPIL15 expres- sion is probably involved in photomorphogenesis in rice.

关键词： Auxin cell wall etiolated seedling rice photomorpho-genesis phytochrome-interacting factor

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Expression Patterns of OsPIL11,a phytochrome-interacting factor in Rice,and Preliminary Analysis of Its Roles in Light Signal Transduction

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Rice science 2012年第4期19卷 263-268页

作者： LI Li PENG Wei-feng LIU Qian-qian ZHOU Jin-jun LIANG Wei-hong XIE Xian-zhi High-Tech Research Center Shandong Academy of Agricultural Sciences College of Life Science Henan Normal University College of Life Sciences Shandong Normal University

The expression patterns of OsPILll, one of six putative phytochrome-interacting factors, were analyzed in different organs of transgenic tobacco （Nicotiana tabacum）. The expression of OsPIL 11 was organ-specific and was regulated by leaf development, abscisic acid （ABA）, jasmonic acid （JA） and salicylic acid （SA）. To further explore the role of OsPIL 11 in plant light signal transduction, a plant expression vector of OsPILll was constructed and introduced into tobacco. When grown under continuous red light, OsPILll-overexpressed transgenic tobacco exhibited shorter hypocotyls and larger cotyledons and leaves compared to wild-type seedlings. When grown under continuous far-red light, however, transgenic and wild-type seedlings showed similar phenotypes. These results indicate that OsPILll is involved in red light induced de-etiolation, but not in far-red light induced de-etiolation in transgenic tobacco, which lays the foundation for dissecting the function of OsPIL11 in phytochrome-mediated light signal transduction in rice.

关键词： rice phytochrome-interacting factor transgenic tobacco light signal transduction

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Expanding Roles of PIFs in Signal Integration from Multiple Processes

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Molecular Plant 2017年第8期10卷 1035-1046页

作者： Inyup Paik Praveen Kumar Kathare Jeong-II Kim Enamul Huq Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology The University of Texas at Austin Austin TX 78712 USA Department of Biotechnology and Kumho Life Science Laboratory Chonnam National University Gwangju 61186 Korea These authors contributed equally to this article.

phytochrome-interacting factors （PIFs） are members of the basic helix-loop-helix （bHLH） family of transcription factors in Arabidopsis. Since their discovery in phytochrome-mediated light signaling pathways, recent studies have unraveled new functions of PIFs in integrating multiple signaling pathways not only through their role as transcription factors directly targeting gene expression but also by interacting with diverse groups of factors to optimize plant growth and development. These include endogenous （e.g., hormonal） as well as abiotic （light, circadian, and elevated temperature） and biotic （defense responses） pathways. PIFs interact with key factors in each of these pathways and tailor the outcome of the signal integration among these pathways. This review discusses the roles of PIFs as pivotal signal integrators in regulating plant growth and development.

关键词： circadian clock growth-defense tradeoff hormone signaling phytochrome-interacting factor ther-momorphogenesis signal integration

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