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| Internal phosphate starvation signaling and external phosphate availability have no obvious effect on the accumulation of cadmium in rice |
WANG Xue-qing, RUAN Wen-yuan, YI Ke-ke
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Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 10081, P.R.China |
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Abstract Phosphorus (P) is a limiting nutrient element for crop. To obtain maximum crop yield, P fertilizer is often over-applied, which leads to accelerating exhaustion of phosphate resources and serious environmental problems. Reducing the application of P fertilizer and enhancing the P utilization efficiency of crops are significant for the sustainable development of agriculture. Cadmium (Cd) contamination in rice is another serious agricultural issue. However, whether reducing the application of P fertilizer and enhancing the P utilization efficiency of crops will increase the risk of Cd accumulation in crops remains obscure. In this study, we are aiming to elucidate the relationship between Cd and P in rice from physiological and genetic perspectives. For this purpose, the wild type (WT) rice plants and phosphate (Pi)-starvation signaling repressed mutant phr2 were used to analyze the relationship between Cd and P. Here, we found that Cd stress could promote P accumulation and induce Pi-starvation signaling in WT and phr2 shoots under Pi-sufficient condition in a PHOSPHATE STARVATION RESPONSE 2 (PHR2) independent manner. Besides, the expression level of Cd transporter of OsNramp5 and the uptake speed of Cd2+ were not obviously changed under Pi-sufficient and Pi-deficient conditions. Furthermore, our Cd determination results showed that the Cd concentrations in WT and phr2 were not obviously changed under Pi-sufficient and Pi-deficient conditions. These results indicate that the external P availability and internal Pi-starvation signaling cannot obviously affect the accumulation of Cd in rice seedling.
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Received: 04 May 2018
Accepted:
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| Fund: This research was supported by the National Key Research and Development of China (2017YFD0200204) and the National Natural Science Foundation of China (31601807). |
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Corresponding Authors:
Correspondence RUAN Wen-yuan, Tel: +86-10-82108643, E-mail: ruanwenyuan@caas.cn
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| About author: WANG Xue-qing, Mobile: +86-15501132682, E-mail: wangxueqing2011@163.com; |
Cite this article:
WANG Xue-qing, RUAN Wen-yuan, YI Ke-ke.
2019.
Internal phosphate starvation signaling and external phosphate availability have no obvious effect on the accumulation of cadmium in rice. Journal of Integrative Agriculture, 18(9): 2153-2161.
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