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Alginate oligosaccharide elicitor induces tobacco resistance to low temperature

Alginate oligosaccharide is a degradation product of alginate. It is a polymer composed of 2 to 10 monosaccharide molecules connected by glycosidic bonds. It has low molecular weight, good solubility, high body absorption and utilization, good stability and Safe and non-toxic physical and chemical properties. It has been reported that a certain concentration of Alginate oligosaccharides can induce low temperature tolerance in tobacco, and can be used as an inducing factor to improve the low temperature tolerance of tobacco. To study the protective effect of Alginate oligosaccharides on tobacco at low temperature, the Alginate oligosaccharide solution was evenly sprayed on the tobacco leaves and placed at (4 ± 1) ℃ for low temperature stress, and related indicators were tested at different intervals. Studies have found that Alginate oligosaccharides have the effect of inducing stimulating factors, which can induce the increase of tobacco CAT, SOD and POD activities, remove oxygen free radicals produced in the body, protect cell membranes and chlorophyll structure, reduce tobacco leaf damage, and improve tobacco resistance to low temperature. 0.20% Alginate oligosaccharides have the best induction effect; 0.10% Alginate oligosaccharides have the effect of antifreeze protection, and there is no obvious change in tobacco indicators within 24 hours, which can protect cells from low temperature damage.

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