Abstract
As an essential element, zinc also is a heavy metal. Non-heading Chinese cabbage showed obvious tolerance to Zn stress in former research. To further understand the mechanisms involved in Zn adaptability and detoxification, two genotypes Suzhouqing and Aijiaohuang were selected to investigate the chemical forms of Zn and root exudation. Zinc stress obvious strained the plant growth, and Aijiaohuang was more injured than Suhouqing under Zn stress. Under normal Zn levels, the chemical forms of Zn were diverse in three organs between genotypes. Results showed extractions of 2% HAc, 80% ethanol and 1 M NaCl were separately dominant in roots, petioles and leaves. However, under Zn stress (13 mg·L–1 and 52 mg·L–1) most of the Zn was extracted by 1M NaCl, and the subdominant amount of Zn was extracted by 80% ethanol. In the control only four types of organic acid could be detected. While under Zn stress, oxalic acid, tartaric acid, malic acid, lactic acid, acetic acid, citric acid and amber acid were all detected, so it could be speculated Zn detoxification with organic ligands or integrated with pectates and proteins in cells might be responsible for the adaptation of Zn stress in Chinese cabbage.
Highlights
Non-heading Chinese cabbge (Brassica campestris ssp. chinensis Makino), is one of the most popular leaf vegetables, widely cultivated in north and south China
Though the biomass of non-heading Chinese cabbage was decreased by Zn stress, they were still alive, which indicates some tolerant mechanism is produced
Chemical speciation of heavy metals is closely related to their biological function, and different chemical forms of Zn extracted by different designated extraction solutions have distinct toxicity degrees and migration of Zn
Summary
Non-heading Chinese cabbge (Brassica campestris ssp. chinensis Makino), is one of the most popular leaf vegetables, widely cultivated in north and south China. Unreasonable emissions of zinc galvanized Industrial waste, such as zinc mining, smelting and processing which led to extraordinary accumulation of zinc in the soil. Zinc in contaminated soil was absorbed by plants, which caused zinc toxicity. Agricultural products may be contaminated and through the food chain human health will be threatened [1,2,3]. Heavy metal pollution has caused worldwide concern. This program was to investigate chemical form of zinc and the root exudation in non-heading Chinese cabbage under Zn stress, which provides some theoretical evidence for Zn tolerance mechanisms in plants
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