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Calcium acetate‐induced reduction of cadmium accumulation in Oryza sativa : Expression of auto‐inhibited calcium‐ ATP ase and cadmium transporters
Author(s) -
Treesubsuntorn C.,
Thiravetyan P.
Publication year - 2019
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12990
Subject(s) - oryza sativa , cadmium , calcium , transporter , biology , shoot , biochemistry , genetically modified rice , food science , horticulture , chemistry , gene , genetically modified crops , transgene , organic chemistry
Calcium (Ca) signalling has an essential role in regulating plant responses to various abiotic stresses. This study applied Ca in various forms (Ca acetate and CaCl 2 ) and concentrations to reduce cadmium (Cd) concentration in rice and propose a possible mechanism through which Ca acts to control the Cd concentration in rice. The results showed that supplementation of Cd‐contaminated soil with Ca acetate reduced the Cd concentration in rice after exposure for 7 days in both hydroponic and soil conditions. The possible involvement of the auto‐inhibited Ca 2+ ‐ ATP ase gene ( ACA ) might act to control the primary signal of the Cd stress response. The messages from ACA 3 and ACA 13 tended to up‐regulate the low‐affinity cation transporter ( Os LCT 1 ) and down‐regulate Cd uptake and the Cd translocation transporter, including the genes, natural resistance‐associated macrophage protein 5 ( Nramp5 ) and Zn/Cd‐transporting ATP ase 2 ( HMA 2 ), which resulted in a reduction in the Cd concentration in rice. After cultivation for 120 days, the application of Ca acetate into Cd‐contaminated soil inhibited Cd uptake of rice. Increasing the Ca acetate concentration in the soil lowered the Cd concentration in rice shoots and grains. Moreover, Ca acetate maintained rice productivity and quality whereas both aspects decreased under Cd stress.