Journal
CHEMOSPHERE
Volume 263, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128034
Keywords
Cadmium; Salicylic acid; Rice; Cd accumulation; SA-Signaling pathway
Categories
Funding
- Natural Science Foundation of Zhejiang Province, China [LY17C020005, LQ18C020001, LY19C020001]
- National Nature Science Foundation of China [31771698]
- National Key Research and Development Project of China [2018YFE0111900, 2017YFD0801104-5]
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The use of salicylic acid spray can reduce cadmium accumulation in rice grains, alleviate cadmium toxicity by increasing the activity of antioxidant enzymes, and decrease cadmium content in rice leaves during the flowering stage to reduce cadmium translocation to grains.
Cadmium (Cd) contamination, which poses a serious threat to human health, has been recognized as a major threat to the agricultural system and crop production. Salicylic acid (SA) is a signaling molecule that plays an important role in against Cd toxicity. Previously, we found that spraying rice with SA could reduce the Cd accumulation in rice grains grown in Cd-contaminated soil. In this study, we studied the specific mechanism of SA spray on reducing Cd accumulation in rice grain. The results showed that treatment with SA could alleviate Cd toxicity in rice by increasing the activities of antioxidant enzymes that reduce hydrogen peroxide (H2O2) accumulation, but not by changing the pH, or total or available Cd of the soil. The key factor by which SA treatment reduced Cd accumulation in rice grains was by decreasing the Cd content in rice leaves at the flowering stage. This indicated that SA could modulate the Cd accumulation in shoots, reducing the Cd translocation to rice grains. Furthermore, SA could increase the H2O2 content, activating the SA-signaling pathway and modulating the expression levels of Cd transporters (OsLCT1 and OsLCD) in rice leaves to increase Cd tolerance and reduce Cd accumulation in the rice grain. Thus, spraying rice with SA may be effective measure to cope with Cd contamination in paddy soils. (C) 2020 Elsevier Ltd. All rights reserved.
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