期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 190, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2019.110090
关键词
Camellia sinensis; Cadmium; Cadmium toxicity; Indole acetic acid
资金
- National Natural Science Foundation of China [31271789]
- Hunan Provincial Key Research and Development Program [2017NK2193]
- Special Project for the Construction of Modern Agricultural Industrial Technology System in Hunan Province [xiangcai nongzhi [2019] 0047]
- Central Committee Guides Local Science and Technology Development Program [2019XF5041]
Cadmium (Cd), a toxic heavy metal, restrains the growth and development of plants and threatens global food safety. Many studies on the alleviation-of heavy metal toxicity by exogenous phytohormones have emerged, but reports on tea (Camellia sinensis) are still scarce. In this study, the effects of indole acetic acid (IAA) (2 mu M and 10 mu M) on Cd uptake and on the physiological and biochemical characteristics of the 'Xiangfeicui' tea cultivar were investigated for the first time. The order of Cd accumulation in tea seedlings was root > stem > mature leaf > tender leaf. Under Cd stress (30 mg kg(-1)), photosynthetic pigment levels, antioxidant enzyme activity, root vigor, root IAA content, and the levels of most metabolites (including caffeine, soluble sugar, total amino acids, some amino acid components, and most catechins) were significantly reduced, while levels of malondialdehyde, proline, epicatechin, and some amino acids increased. We therefore propose that by reducing Cd accumulation, exogenous IAA can lessen the adverse effects of Cd on the physiology and biochemistry of tea seedlings, promoting the growth of healthier tea plants.
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