Journal
JOURNAL OF INTEGRATIVE AGRICULTURE
Volume 18, Issue 9, Pages 2153-2161Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(18)62100-8
Keywords
cadmium; phosphorus; Cd-accumulation; Pi-starvation signaling; Pi-availability
Categories
Funding
- National Key Research and Development of China [2017YFD0200204]
- National Natural Science Foundation of China [31601807]
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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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