桔褐天牛为害与寄主营养和次生代谢物质的相关性分析OA

[Objective]The damage of Nadezhdiella cantori to Zhangtouhong in Jiangxi's Zhangshu medicinal materials base was investigated,and the relationship between its damage and nutrients and secondary metabolites of host plants was analyzed.The study provides references for exploring the ecological regulation technology of N.cantori.[Method]The damage status of N.cantori to Zhangtouhong was investigated by sampling line survey.The total soluble sugar,reducing sugar and soluble protein content at DBH(diameter at breast height)and base in the trunk of Zhangtouhong were measured by using anthrone colorimetry,the 3.5-dinitrosalicylic acid(DNS)method and Coomassie Brilliant Blue G-250 assay,respectively.The content of polyphenols,tannins,flavonoids and total triterpenes was determined by spectrophotometry,and the relationship between the damage of N.cantori and the content of nutrition and secondary metabolites of Zhangtouhong was analyzed.[Result]The damage rate of Zhangtouhong by N.cantori was 36.15±5.89%in Zhangshu City,and over 70%of the borer holes of N.cantori were concentrated at or above the DBH of the Zhangtouhong trunk.The content of nutrients in the trunk of Zhangtouhong generally followed the order:total soluble sugar＞reducing sugar＞soluble protein.There was no significant difference in the content of soluble total sugar and soluble protein between the DBH and the base,while the content of reducing sugar in the DBH was significantly higher than that in the base.The damage of N.cantori was significantly positively correlated with the content of reducing sugar in Zhangtouhong trunk,but not with nutrients in other parts.Polyphenols were secondary metabolites with high content in the trunk of Zhangtouhong,and the damage of N.cantori was negatively correlated with the content of polyphenols,total triterpenes at DBH and tannin in different parts.The content of tannin and total triterpenoids decreased in the plants damaged by N.cantori,while the content of polyphenols increased significantly in the base of the trunk.[Conclusion]The content of reducing sugar of Zhangtouhong has an important influence on the pest selection of N.cantori.The damage from borer holes could reduce the content of total triterpenoids and tannins in the trunk of the host plants of N.cantori,and polyphenols play a leading role in the defense system of host plants of N.cantori.