Effects of salinity on anatomical features and physiology of a semi-mangrove plant Myoporum bontioides |
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| Authors: | HM Xu NFY Tam QJ Zan M Bai PKS Shin LLP Vrijmoed SG Cheung WB Liao |
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| Institution: | 1. Key Laboratory of Biodiversity Dynamics and Conservation of Guangdong Higher Education Institutes, and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China;2. Futian-CityU Mangrove Research and Development Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region;3. Shenzhen Wildlife Rescue and Rehabilitation Center, Xinzhou Road, Shenzhen 518048, China;4. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region;5. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China |
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| Abstract: | The effect of different concentrations of NaCl, 0, 100, 200, 300 and 400 mM, on the anatomical features and physiology of Myoporum bontioides was investigated. The photosynthetic rates (Pn) were significantly reduced by salt stress, with the lowest values at 400 mM NaCl. The content of malondialdehyde (MDA), proline and soluble sugar, as well as the activities of peroxidase (POD) and catalase (CAT) increased at the beginning, but became similar to the control as the experiment proceeded. The NaCl effect on superoxide dismutase (SOD) was different from the other parameters, with a significant reduction at 400 mM NaCl at Day 7. Salt glands were found in both upper and lower epidermis, and the ratios of the thickness of palisade to spongy mesophyll tissues increased with NaCl concentrations. The medullary ray was clearly damaged by NaCl at levels of 200 and 300 mM. These results demonstrated that M. bontioides could adapt to a relatively low salinity, and was not a halophilous species. |
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| Keywords: | Myoporum bontioides Salt adaptability Anatomical features Physiological traits |
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