McClure Mark S, Hare J Daniel
Department of Entomology, The Connecticut Agricultural Experiment Station, P.O. Box 1106, 06504, New Haven, CT, USA.
Oecologia. 1984 Aug;63(2):185-193. doi: 10.1007/BF00379876.
The relationship between the reproductive success of two Japanese scale insects, Fiorinia externa Ferris and Nuculaspis tsugae (Marlatt) (Homoptera: Diaspididae) and the concentrations of 15 terpenoids in needles of Tsuga sieboldii, the Japanese host, and T. canadensis, the North American host, was investigated during 1981 and 1982 in a field plot of 8-year-old trees in New Haven, CT, USA. Both scales produced significantly more eggs per female on T. sieboldii than on T. canadensis. Stepwise multiple regression analyses indicated that the variation in fecundity within both scales was strongly associated with variation in the terpenoid profile between tree species.General patterns of phytochemical variation between the two Tsuga species based on differences in the concentration of terpenoids having similar chemical structures were revealed by the multivariate statistical technique, principal components analysis. The volatile leaf oil profile of T. sieboldii was relatively richer in terpene alcohols, while that of T. canadensis was relatively richer in terpene hydrocarbons and terpene acetates. The individual terpenoids were then assigned to one of five groups based on chemical structure and regression analyses were repeated; fecundity of both scales increased with increasing concentration of terpenoid alcohols. Fecundity of F. externa was negatively associated with the relative concentration of acyclic terpenes but the opposite was true for N. tsugae. Analysis of foliar terpenoids may provide a basis for predicting the relative susceptibility of Tsuga species to attack by F. externa and N. tsugae.
1981年至1982年期间，在美国康涅狄格州纽黑文市一块8年生树木的田间地块上，研究了两种日本蚧虫，即杉肤小蠹（Fiorinia externa Ferris）和铁杉核盾蚧（Nuculaspis tsugae (Marlatt)）（同翅目：盾蚧科）的繁殖成功率与日本寄主日本铁杉（Tsuga sieboldii）和北美寄主加拿大铁杉（T. canadensis）针叶中15种萜类化合物浓度之间的关系。两种蚧虫在日本铁杉上每雌虫产卵量均显著高于在加拿大铁杉上。逐步多元回归分析表明，两种蚧虫的繁殖力变化与树种间萜类化合物谱的变化密切相关。通过多元统计技术主成分分析，揭示了两种铁杉基于化学结构相似的萜类化合物浓度差异的植物化学变化总体模式。日本铁杉的挥发性叶油谱中萜烯醇相对丰富，而加拿大铁杉的挥发性叶油谱中萜烯烃和萜烯乙酸酯相对丰富。然后根据化学结构将各个萜类化合物分为五组之一，并重复进行回归分析；两种蚧虫的繁殖力均随着萜烯醇浓度的增加而增加。杉肤小蠹的繁殖力与无环萜烯的相对浓度呈负相关，但铁杉核盾蚧则相反。对叶部萜类化合物的分析可为预测铁杉属树种对杉肤小蠹和铁杉核盾蚧侵害的相对易感性提供依据。
