Journal of Integrative Agriculture ›› 2019, Vol. 18 ›› Issue (9): 2153-2161.DOI: 10.1016/S2095-3119(18)62100-8

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  • 收稿日期:2018-05-04 出版日期:2019-09-01 发布日期:2019-08-31

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
 
  

  1. 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
  • Received:2018-05-04 Online:2019-09-01 Published:2019-08-31
  • Contact: Correspondence RUAN Wen-yuan, Tel: +86-10-82108643, E-mail: ruanwenyuan@caas.cn
  • About author:WANG Xue-qing, Mobile: +86-15501132682, E-mail: wangxueqing2011@163.com;
  • Supported by:
    This research was supported by the National Key Research and Development of China (2017YFD0200204) and the National Natural Science Foundation of China (31601807).

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.

Key words: cadmium ,  phosphorus ,  Cd-accumulation ,  Pi-starvation signaling ,  Pi-availability