Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-29 Cooperative journals: 《广西植物》
Abstract： In order to test the ability of Thuarea involuta to adapt to adversity and to reveal its mechanism of salt tolerance, we collected samples from the tropical coral xisha dongdao island, and selected vigorous plants as the subsequent experiment materials through vegetative propagation, which were then treated with different salt stress degree. We studied the effects of treatments with different NaCl concentration on the contents of Malondialdehyde (MDA), antioxidase and osmotic regulator in leaves of T. involuta. Our results showed that the increase of NaCl concentration did not accelerate the membrane lipid peroxidation of T. involuta leaf cells under a short term of salt treatment (28 d), but the peroxidation effect worsened with the extension of salt treatment time and increase of NaCl concentration, which also, resluted in a gradually rising of the content of MDA, reaching the peak at 400 mmol稬-1 of NaCl concentration. Under the short term of salt stress treatment (28 d), the activity of SOD and CAT were significantly increased under the low (200 mmol稬-1) and high (400 mmol稬-1) NaCl concentration, respectively, the activity of POD gradually ascended with the increase of salt stress time and NaCl concentration. We discovered that under salt treatment, T. involuta accumulated SP and PRO to improve the osmotic regulation ability, which balanced the osmotic potential inside and outside the cell membranes and lowered the demage of salt stress. In conclusion, T. involuta can apply both of the antioxidant enzyme defense system and osmotic regulation mechanism under salt stress, to reduce the damage caused by lipid peroxidation of cell membrane and to ease physiological drought. In this case, we regarded the species has high salt tolerance. The results can provide scientific foundation for artificial community construction of T. involuta, vegetation restoration and landscaping design on South China Sea Islands, and it has great significance for sustainable development to tropical coral islands in China.
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