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Overexpression of an S-like ribonuclease gene, OsRNS4, confers enhanced tolerance to high salinity and hyposensitivity to phytochrome-mediated light signals in rice

文献类型： 外文期刊

作者： Zheng, Jun 1 ; Wang, Yingying 1 ; He, Yanan 1 ; Zhou, Jinjun 1 ; Li, Yaping 1 ; Liu, Qianqian 1 ; Xie, Xianzhi 1 ;

作者机构： 1.Shandong Acad Agr Sci, Shandong Rice Res Inst, Jinan 250100, Shandong, Peoples R China

2.Shandong Prov Key Lab Crop Genet Improvement Ecol, Jinan 250100, Peoples R China

关键词： Rice;Ribonuclease;Photomorphogenesis;Abscisic acid;Salt tolerance

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2014 年 214 卷

页码：

收录情况： SCI

摘要： 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 WE. Our findings supply new evidence on the functions of monocot S-like RNase in regulating photosensitivity and abiotic stress responses. (C) 2013 Elsevier Ireland Ltd. All rights reserved.

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