温室白粉虱取食行为的刺探电位(EPG)研究

该文揭示了温室白粉虱Trialeurodes vaporariorum Westwood成虫及幼虫的刺探电位波形与其刺探、取食、产卵行为之间的对应关系，并讨论了这项技术在研究植物抗虫机理方面的应用价值。在成虫，A波、C波分别代表刺探的开始和进行过程；F波代表刺探过程中遇到机械障碍；G波表示吸食木质部导管汁液；E(pd)的(1)和(2)分别表示与取食韧皮部筛管汁液有关的两种行为；粉虱的产卵波形分为两种亚波，分别由Ovi-I和Ovi-II表示，各自代表产卵时的两种行为：产卵器接触并划破叶表皮及卵柄插入叶组织。在幼虫，H波代表吸食筛管液，而L波则表示在筛管细胞内的一种非吸食行为。幼虫蜕皮时先拔出口针，新龄期的幼虫将其口针重新刺入叶组织。

ELECTRICAL PENETRATION GRAPHS OF GREENHOUSE WHITEFLY, TRIALEURODES VAPORARIORUM (WESTWOOD)

The relationships were described in this paper between the Electrical Penetration Graphs (EPGs) of greenhouse whitefly,Trialeurodes vaporariorum (Westwood),and its probing, feeding and ovipositing activities. The potential application of this method in interpretating the resistance mechanisms against whitefly was also discussed.For whitefly adults, the A pattern and C pattern represent the probing initiation on the leaf surface and probing process in the mesophyll. The G pattern indicates xylem drinking and the E(pd), (1) & (2) are two different activities in sieve element and thus relate to phloem ingestion. Moreover, oviposition can be observed from EPG recordings, consisting of two subpatterns termed as Ovi-I and Ovi-II. For whitefly larvae, the H pattern indicates phloem ingestion but L pattern not, though still in sieve element. A procedure of styler withdrawal and repenetration occurs before and after moulting.