title: Overexpression of OsPIL15, a phytochrome-interacting factor-like protein gene, represses etiolated seedling growth in rice.
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.
authors.affiliation: Shandong Rice Research Institute, Shandong Academy of Agricultural Sciences, Jinan, 250100, China; Shandong Provincial Key Laboratory of Crop Genetic Improvement, Ecology and Physiology, Jinan, 250100, China.
authors.forename: Jinjun
authors.initials: J
authors.lastname: Zhou
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Liu
authors.forename: Fang
authors.initials: F
authors.lastname: Zhang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Wang
authors.forename: Shiyong
authors.initials: S
authors.lastname: Zhang
authors.forename: Huimin
authors.initials: H
authors.lastname: Cheng
authors.forename: Lihua
authors.initials: L
authors.lastname: Yan
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Fan
authors.initials: F
authors.lastname: Chen
authors.forename: Xianzhi
authors.initials: X
authors.lastname: Xie
mesh_terms: D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D012275:Oryza / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D036226:Seedlings / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*
chemical_list: D010940:Plant Proteins
keywords: Auxin; cell wall; etiolated seedling; photomorphogenesis; phytochrome-interacting factor; rice