J Integr Plant Biol. ›› 2014, Vol. 56 ›› Issue (4): 373-387.DOI: 10.1111/jipb.12137

Special Issue: Abiotic Stresses

• Cell and Developmental Biology • Previous Articles     Next Articles

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

Jinjun Zhou1,2, Qianqian Liu1,3, Fang Zhang4, Yingying Wang1,2, Shiyong Zhang1,2, Huimin Cheng1, Lihua Yan1, Li Li1, Fan Chen4 and Xianzhi Xie1,2,3*   

  1. 1Shandong Rice Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
    2Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan, China
    3College of Life Sciences, Shandong Normal University, Jinan, China
    4Institute of Genetics and Developmental Biology, the Chinese Academy of Sciences, Beijing, China
  • Received:2013-10-01 Accepted:2013-11-17 Published:2013-11-26
  • About author:*Corresponding: E-mail: xzhxie2010@163.com

Abstract:

Phytochrome-interacting factors (PIFs) regulate an array of developmental responses ranging from seed germination 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 aboveground 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 expression is probably involved in photomorphogenesis in rice.

Zhou J, Liu Q, Zhang F, Wang Y, Zhang S, Cheng H, Yan L, Li L, Chen F, Xie X (2014) Overexpression of OsPIL15, a phytochrome‐interacting factor‐like protein gene, represses etiolated seedling growth in rice. J Integr Plant Biol 56: 373–387. doi: 10.1111/jipb.12137

Key words: Auxin, cell wall, etiolated seedling, rice, photomorphogenesis, phytochrome-interacting factor

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