紫胶蚧与寄主植物氨基酸含量关系初步研究

采用主分量分析、聚类分析等方法研究7种寄主植物氨基酸含量与紫胶蚧关系,结果显示：(1)不同寄主植物和是否被寄生的枝条之间,氨基酸含量存在差异。(2)当寄主植物枝条与久树1年生枝条氨基酸含量相近时,能产生较厚的胶被;偏离久树1年生枝条氨基酸含量越远,紫胶蚧在该寄主植物上的死亡率、怀卵量越高。(3)紫胶蚧寄生后久树枝条中氨基酸总量减少了35％左右,天门冬氨酸、苏氨酸、丝氨酸、苷氨酸、丙氨酸、缬氨酸、异亮氨酸、亮氨酸、酪氨酸、苯丙氨酸的含量也都存在不同程度减少,但久树枝条中蛋氨酸、组氨酸、赖氨酸、精氨酸、色氨酸含量比未放虫枝条中高。其他寄主植物放虫枝条中也有不同种类的氨基酸含量比未放虫枝条中升高或降低的现象。

A Study on the Relationship between Amino Acid Content of Host Trees and Kerria lacca

The relationship between amino acid contents of host trees and Kerria lacca was studied. The results were as follow:1.Amino acid contents among 7 different host trees species and branches hosted or not hosted by Kerria lacca were different. Principal components showed that the amino acid contents of 14 different branches could be divided into 3 groups.2.When the amino acid contents of hosted branch were close to the amino acid contents of annual kusum branch, the thickness of raw lac was thicker; when the amino acid contents of hosted branch were departed from that of annual kusum branch,Kerria lacca had higher mortality and fecundity; the relationship between amino acid contents of hosted branch and the amount lac secreted by per lac insect was complicated. 3.Kerria lacca hosting had some influence on amino acid contents of branch. The entire amino acid contents of hosted branch decreased by 35% comparing to that of control kusum branch, the contents of aspartic acid, threonine, serine, glycine, alanine, isolleucine, tyrosine, valine, leucine, phenylalanine and methionine decreased in different degree. But after hosted by Kerria lacca,the contents of histidine, lysine, arginine and tryptophan were higher than that of control branch. The contents of some kinds amino acid of hosted branch also increased or decreased in other species host trees.