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2012年49 No.4
Volatile changes of Opuntia ficus-indica Mill before and afterparasitizing by Dactylopius coccus Costa
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Key Words： Dactylopius coccus，Opuntia ficus-indica，volatile，auto thermal-desorption gas chromatography /massspectrometry (ATD-GC /MS)
Abstract：Volatile components from Opuntia ficus-indica Mill parasitized by Dactylopius coccus Costa were closely and
circularly head-space sampled within adsorptive tubes，then analyzed by auto thermal-desorption gas chromatography /mass
spectrometry (ATD-GC /MS) ． Eight kinds of compounds were detected in the volatiles collected from unparasitized O．
ficus-indica ，and 9 kinds from those parasitized by D． coccus． The volatile components from parasitized and unparasitized
plants differed in variety and content． Terpenes are the major components in herbivore-induced plant volatiles． In this
experiment，terpenes reduced from 23. 12% to 6. 98% after parasitization by D． coccus． Benzaldehyde ( 1. 73% ) was
only detected in healthy plants while esters (21. 15% )，alcohols (1. 79% ) and aromatic hydrocarbons (1. 51% ) were
detected in parasitized plants．