Effects Of Ginkgo Biloba Exocarp Extracts On The Yield And Quality Of Mulberry Leaves And Silkworm Cocoons

Ginkgo biloba L.is one of a unique eco-economic tree species in China,and its fruit,leaf and flower material have high value.It has been cultivated in large areas as fruit forest,leaf forest and timber forest.Ginkgo biloba exocarp accounts for 2/3 of the actual weight of the Ginkgo biloba seeds,which are currently discarded as waste,have not been developed and used,and pollute the environment.Therefore,the development and utilization of Ginkgo biloba exocarp has important economic and ecological value.In this experiment,the Ginkgo biloba exocarp was used as the test material,and the mulberry tree was used as the research object.Through the field test,the effects of different concentrations of Ginkgo biloba exocarp extract on the yield and quality of mulberry leaves were investigated.And feed the silkworms with treated mulberry leaves,and analyze their effects on the growth of silkworms and the quality of cocoons and silks;through pot experiments,the effects of extracts of the main components of Ginkgo biloba exocarp on the yield and quality of mulberry leaves were explored,and the main active ingredients with the effect of Ginkgo biloba exocarp on the yield and quality of mulberry leaves were selected.The research results can provide a certain theoretical basis for the development and utilization of Ginkgo biloba exocarp,and have certain application value.The main results are as follows:?1?Spraying the appropriate concentration of Ginkgo biloba exocarp extract can promote the growth of mulberry and the quality of mulberry leaves.When the concentration is in the range of 5-20 g·L^-1,the promotion effect of leaf area,leaf yield,total nitrogen content,protein content and total flavonoid content is the most obvious.?2?Through the silkworm rearing experiment,it was found that the amount of cocoon layer,cocoon layer rate,and cocoon silk yield of the silkworm cocoon were significantly higher than those of CK when spraying Ginkgo biloba exocarp extract.When the concentration is 10-20g·L^-1,The promotion effect of the quality of silkworm cocoon and cocoon silk is most obvious.?3?Spraying Ginkgo biloba exocarp polysaccharide extract can significantly increase the growth of mulberry branches and leaves.The concentration of 2.0 g·L^-1 is the best;spraying Ginkgo biloba exocarp flavonoid extract can significantly improve the content of soluble protein and soluble sugar in the leaves,and the concentration of 1.0 g·L^-1 is the best;spraying Ginkgo biloba exocarp phenolic acid extract on mulberry leaves shows that low concentration promotes growth and high concentration inhibition of growth,when the concentration is 0.25 g·L^-1,it can promote the growth,photosynthesis of mulberry tree and the index of mulberry leaf related metabolites;spraying the mixed extract of Ginkgo biloba exocarp can significantly promote mulberry leaf photosynthesis,improve the chlorophyll content,total flavonoid content and?-aminobutyric acid content of mulberry leaves,and the concentration of 1.5 g·L^-1 is the best.In summary,appropriate concentration of Ginkgo biloba extract can promote mulberry growth and improve silkworm cocoon quality.The combined action of Ginkgo biloba exocarp polysaccharides and flavonoids is an important reason why the Ginkgo biloba exocarp extract can promote the quality of mulberry leaves.