title: Overexpression of an S-like ribonuclease gene, OsRNS4, confers enhanced tolerance to high salinity and hyposensitivity to phytochrome-mediated light signals in rice.
abstract: S-like ribonucleases (S-like RNases) are homologous to S-ribonucleases (S-RNases), but are not involved in self-incompatibility. In dicotyledonous plants, S-like RNases play an important role in phosphate recycling during senescence and are induced by inorganic phosphate-starvation and in response to defense and mechanical wounding. However, little information about the functions of the S-like RNase in monocots has been reported. Here, we investigated the expression patterns and roles of an S-like RNase gene, OsRNS4, in abscisic acid (ABA)-mediated responses and phytochrome-mediated light responses as well as salinity tolerance in rice. The OsRNS4 gene was expressed at relatively high levels in leaves although its transcripts were detected in various organs. OsRNS4 expression was regulated by salt, PEG and ABA. The seedlings overexpressing OsRNS4 had longer coleoptiles and first leaves than wild-type seedlings under red light (R) and far-red light (FR), suggesting negative regulation of OsRNS4 in photomorphogenesis in rice seedlings. Moreover, ABA-induced growth inhibition of rice seedlings was significantly increased in the OsRNS4-overexpression (OsRNS4-OX) lines compared with that in WT, suggesting that OsRNS4 probably acts as a positive regulator in ABA responses in rice seedlings. In addition, our results demonstrate that OsRNS4-OX lines have enhanced tolerance to high salinity compared to WT. Our findings supply new evidence on the functions of monocot S-like RNase in regulating photosensitivity and abiotic stress responses.
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, 250100 Jinan, China. Electronic address: xiaofeijuner@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Zheng
authors.forename: Yingying
authors.initials: Y
authors.lastname: Wang
authors.forename: Yanan
authors.initials: Y
authors.lastname: He
authors.forename: Jinjun
authors.initials: J
authors.lastname: Zhou
authors.forename: Yaping
authors.initials: Y
authors.lastname: Li
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Liu
authors.forename: Xianzhi
authors.initials: X
authors.lastname: Xie
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000595:Amino Acid Sequence; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D008027:Light; D008969:Molecular Sequence Data; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D012275:Oryza / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D010834:Phytochrome / Q000235:genetics*; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics*; D030821:Plants, Genetically Modified; D011092:Polyethylene Glycols / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012260:Ribonucleases / Q000235:genetics*; D054712:Salinity; D055049:Salt Tolerance / Q000235:genetics*; D055051:Salt-Tolerant Plants / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D036226:Seedlings / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects
chemical_list: D010937:Plant Growth Regulators; D010940:Plant Proteins; D010834:Phytochrome; D011092:Polyethylene Glycols; D000040:Abscisic Acid; D012260:Ribonucleases
keywords: ABA; Abscisic acid; FR; MS; Murashige and Skoog; OsRNS4-OX; OsRNS4-overexpression; PEG; Photomorphogenesis; R; RNase; Ribonuclease; Rice; Salt tolerance; UBQ; WT; abscisic acid; eEF-1α; eukaryotic elongation factor 1-alpha gene; far-red light; phyA; phyB; phyC; phytochrome A; phytochrome B; phytochrome C; polyethylene glycol; red light; ribonuclease; ubiquitin gene; wild type