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| Effects of exogenous melatonin on root characteristics of Perilla frutescens under cadmium stress |
| Received:June 02, 2021 |
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| KeyWord:cadmium stress;Perilla frutescens;melatonin;root morphology;anatomical structure |
| Author Name | Affiliation | E-mail | | LI Liang | Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | XIN Zaijun | Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | WANG Xiyang | Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | LI Xiaohui | Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | | | SUN Xiaoyan | Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang 330096, China
Jiangxi Engineering and Technology Research Center of Eco-remediation of Heavy Metal Pollution, Nanchang 330096, China | xiaoyan_sun05@163.com |
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| Abstract: |
| To reveal the role of melatonin-induced root trait variation in alleviating plant cadmium stress, this study recorded the variation in growth, cadmium, and other metal elements contents, as well as morphological and anatomical traits of Perilla frutescens roots under different levels of cadmium stress and exogenous melatonin treatments using hydroponic experiments. The results showed that cadmium stress significantly reduced the growth rate of P. frutescens. Root biomass did not respond to cadmium stress, but root morphological and anatomical traits were significantly affected by cadmium stress. Cadmium stress resulted in shorter roots, thicker root diameter, reduced root surface area, thicker stele, and a reduction in the proportion of cortex in cross-section. Under exogenous melatonin application with low cadmium stress, the above-ground biomass was significantly increased, and root cadmium accumulation and concentration, translocation, and the content and accumulation of cadmium in above-ground parts were significantly decreased. Concurrently, the root length increased, the stele was thinner, the proportion of cortex in the cross-section increased, and the contents of zinc and iron in roots increased significantly. The application of melatonin under high cadmium stress resulted in decreased cadmium translocation and accumulation in aboveground parts and increased zinc content in roots. However, aboveground biomass did not increase. The results indicate that exogenous melatonin can reduce the absorption and translocation of cadmium in P. frutescens and reduce cadmium stress by changing root morphological and anatomical traits, as well as by increasing the absorption of zinc and iron. However, the mitigation effects are affected by the degree of cadmium stress. |
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