Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 211, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.111921
Keywords
Rice; Citric acid; Cadmium; Manganese; NRAMP family genes; Amino acids
Categories
Funding
- National Key Research and Development Program of China [2017YFD0801100]
- Major Scientific Research Project of Hunan Province [XNL [2018] 70]
- Funds for Science and Technology Innovation Project from the Chinese Academy of Agricultural Sciences
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The study found that foliar application of citric acid (CA) can increase the Mn:Cd ratio in rice grains, inhibit Cd accumulation in grains, and enhance the expression levels of OsNramp2, 3 and 5 in panicles. CA also affects amino acid metabolism, increasing the content of specific amino acids in grains.
Citric acid (CA) can regulate the balance of anions and cations in plants, and improve their resistance to heavy metals. It is not clear if foliar application with CA has any effect on migration of Cd and Mn in rice plant. In this work, a low-Cd-accumulating indica rice line (P7) and a high-Cd-accumulating line (HZ) were used to investigate the influence of CA on the transport of Cd and Mn as well as amino acid metabolism in grains. Content of Cd in grains and other organs increased with the increase of Cd content (0.1-2.4 mg kg(-1)) in soil, while decreased with the foliar application with CA. With the increase of Cd content in rice grains, the content of most amino acids in HZ, P7, HZ + CA and P7 + CA showed an obvious decline trend. Foliar application with CA efficiently raised the Mn:Cd ratio in grains and nodes of both HZ and P7. Meanwhile, the expression levels of OsNramp2, 3 and 5 in panicles were efficiently enhanced by CA application when plants grew in soil with Cd content of 0.6-2.4 mg kg(-1). The increasing effect of CA on the content of 4 amino acids (i.e., Glu, Phe, Thr and Ala) in grains was related to varieties and Cd pollution. These results indicate that foliar application with CA can regulate the transport of Cd and Mn in the opposite directions in tissues and inhibit Cd accumulation in grains by enhancing expression of OsNRAMP 2, 3 or 5 and triggering the defense response of some amino acids in Cd-contaminated environment.
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