Phosphate transporter OsPht1;8 in rice plays an important role in phosphorus redistribution from source to sink organs and allocation between embryo and endosperm of seeds

文献类型： 外文期刊

第一作者： Li, Yiting

作者： Li, Yiting;Zhang, Jun;Zhang, Xiao;Fan, Hongmei;Gu, Mian;Qu, Hongye;Xu, Guohua;Li, Yiting;Zhang, Xiao

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关键词： Rice seeds;Phosphate transporter;Phosphorus homeostasis;Source and sink organs

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

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收录情况： SCI

摘要： Phosphorus (P) redistribution from source to sink organs within plant is required for optimizing growth and development under P deficient condition. In this study, we knocked down expression of a phosphate transporter gene OsPht1;8 (OsPT8) selectively in shoot and/or in seed endosperm by RNA-interference using RISBZ1 and GluB-1 promoter (designate these transgenic lines as SSRi and EnSRi), respectively, to characterize the role of OsPT8 in P redistribution of rice. In comparison to wild type (WT) and EnSRi lines, SSRi lines under P deficient condition accumulated more Pin old blades and less P in young blades, corresponding to attenuated and enriched transcripts of P-responsive genes in old and young blades, respectively. The ratio of total P in young blades to that in old blades decreased from 2.6 for WT to 0.9-1.2 for SSRi lines. During the grain-filling stage, relative to WT, SSRi lines showed the substantial decrease of total P content in both endosperm and embryo, while EnSRi lines showed 40-50% decrease of total P content in embryo but similar P content in endosperm. Taken together, our results demonstrate that OsPT8 plays a critical role in redistribution of P from source to sink organs and P homeostasis in seeds of rice. (C) 2014 Elsevier Ireland Ltd. All rights reserved.

分类号： Q94

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