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    Changes of reactive oxygen species in citrus fruit disease resistance induced by oligochitosan
    Hits:1513 Date:2021/9/7 11:28:22

     Citrus is the world's largest fruit, but also the second largest fruit in China, China's agricultural economy occupies a very important position in many areas, has become a leading industry. However, compared with the rapid development of citrus planting industry, the post-production technology research and industrialization of citrus fruits are relatively slow, resulting in a large number of fruit rot every year. Most of these losses are caused by microbial infection, mainly penicillium, green mold, black rot, anthracnose and more than 20 other infectious diseases, among which anthracnose is a worldwide and serious disease, the fruit began to suffer from the stem, the black-brown spot gradually expanded, and finally the whole fruit rotted. At present, fungicides such as 1H-benzimidazole and substituted benzenes are usually used to control postharvest diseases of citrus fruits. However, long-term and frequent use of chemical pesticides will lead to a series of problems such as drug resistance, pesticide residues and environmental pollution. Chitooligosaccharide is a kind of deacetylated Chitooligosaccharide, which is derived from the shell of shrimp, crab, shellfish and so on. It can be used as an important factor to induce the disease resistance of fruits and vegetables, used to control postharvest diseases of grapes, carrots, mangos and other fruits and vegetables. Chitinase and-1,3-glucanase can be induced by chitooligosaccharide in grapes and other fruits, and the production and accumulation of phytoalexins can be induced, so as to improve the resistance of fruits and vegetables to pathogens. CITRUS SINENSIC OSBECK CV. Jincheng 447 # , the disease incidence of citrus fruits inoculated with colletotrichum gloeosporioides after soaking 1.5% (G/G) oligochitosan solution for 1 min was studied, and the changes of reactive oxygen species (Ros) induced by oligochitosan during the early stage of storage were studied. The results showed that the incidence of injury inoculation of citrus fruits treated with Oligochitosan was significantly lower than that of control fruits after 9 days of storage, and the incidence of injury inoculation of citrus fruits after 1d induction of Oligochitosan was the lowest. Compared with the control fruit, 1.5% chitosan oligosaccharide induced the synthesis of hydrogen peroxide (H2O2) in citrus peel, and delayed the decrease of ASA and Glutathione, the activities of Superoxide dismutase, Catalase, Peroxidase, Polyphenol oxidase, ascorbic acid and Glutathione reductase, mitochondrial in citrus peel were also increased.


    The changes of reactive oxygen species (Ros) in citrus fruit disease resistance induced by Chitooligosaccharides (cs) were studied in this paper

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