高温对褐藻羊栖菜逆境生理的影响

doi:10.11978/2020052

Abstract

Abstract:

In this study, Sargassum fusiforme was treated at 27 ℃ and 32 ℃, and Sargassum fusiforme grown at 22 ℃ was used as control. Air bladders were collected at 0, 1, 3, 5, and 7 days of the treatment, respectively, to explore the effects of high temperature stress on membrane damage, osmotic regulation and antioxidant protection of Sargassum fusiforme. The results showed that the membrane system of Sargassum fusiforme was damaged by high temperature stress, which resulted in ion extravasation in vivo, and membrane lipid peroxidation; and the relative conductivity and Malondialdehyde (MDA) content of cells increased. Soluble protein, soluble sugar and proline were accumulated in the cells. Soluble protein was always higher than the control under high temperature stress, and reached the maximum value at 7 days. Soluble sugar and proline increased first and then decreased in the high temperature stress group, but they were always higher than those in the control group. Soluble sugar reached the maximum value at 3 days under high temperature stress, and proline reached the maximum value at 5 days under high temperature stress. After high temperature stress, Sargassum fusiforme can reduce the damage of high temperature stress mainly by increasing the activity of antioxidant enzyme Superoxide dismutase (SOD), while the activities of Peroxidase (POD) and Catalase (CAT) decreased in the process of high temperature stress. In a word, Sargassum fusiforme is more sensitive to high temperature stress. The higher the temperature is, the longer the treatment time is, the greater the damage to Sargassum fusiforme is.

Key words: Sargassum fusiforme, high temperature stress, osmoregulation substance, antioxidant enzymes

CLC Number:

P735.2

LIU Lijie, LIN Lidong. The effect of high temperature on stress physiology of Sargassum fusiforme[J].Journal of Tropical Oceanography, 2021, 40(2): 74-82.

Figures/Tables 9

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References 31

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The effect of high temperature on stress physiology of Sargassum fusiforme

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