Lanthanum(III)-amino acid chelate mitigates copper(II) stress in rice (Oryza sativa)

被引:0
|
作者
Chen, Jiajia [1 ]
Zhong, Yuqing [2 ]
机构
[1] Suzhou Univ Sci & Technol, Sch Chem & Life Sci, Suzhou 215011, Peoples R China
[2] Environm Monitoring Stn Suzhou City, Suzhou 215004, Peoples R China
来源
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
基金
中国国家自然科学基金;
关键词
Lanthanum; Rare earth; Copper; Amino acid; Chelate; Rice (Oryza sativa); REDUCES CADMIUM UPTAKE; L-GLUTAMIC ACID; LANTHANUM IMPROVES; COMPLEXES; SEEDLINGS; PEPTIDES; PHOTOSYNTHESIS; NANOPARTICLES; TOLERANCE; TOXICITY;
D O I
10.1038/s41598-024-73771-4
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Lanthanum (La(III)) is recognized for its ability to mitigate heavy metal stress in plants. However, the inorganic La(III) salts and lanthanum oxide nanoparticles (La2O3 NPs) extensively used in agriculture are prone to soil immobilization, thereby compromising their bioavailability and posing environmental risks. This study synthesized and characterized the lanthanum(III)-amino acid chelate (La(III)-AA) from soybean protein isolate (SPI) hydrolysates. Maximum chelating rate (94.95%) was achieved under the conditions of mole ratio 1:1.5, pH 8.0, 50 degrees C and 5 h. Glu, Asp and Pro represent the primary La(III)-binding ligands. UV-vis and FTIR demonstrated that amino nitrogen and carboxyl oxygen participate in metal-ligand recognition. Scanning and Transmission electron microscopy showed that La(III) chelates with amino acids in a core-shell structure of uniform size. Consequently, a proposed chemical structure for the La(III)-AA complex was presented. A concentration of 20 mg/L La(III)-AA outperforms inorganic La salts in growth promotion and Cu detoxification. La(III)-AA significantly reduces the content of Cu (II) in rice tissues and enhances seedling tolerance to Cu (II) stress. This study provides a novel La(III)-based candidate for crop protection and furthers our understanding of rare earth element-induced mitigation of heavy metal stress.
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页数:13
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