Involvement citrus fruit volatiles in germination and growth of Penicillium digitatum and Penicillium italicum.
A. Eick, D. Macarisin, L. Cohen, G. Rafael, M. Wisniewski and S. Droby.
Journal of Plant Pathology Volume 90 (2, Supplement) August 2008, Book of Abstract, 9th International Congress of Plant Pathology, August 24-29, 2008 Torino,Italy,. 507 pages.
2008
บทคัดย่อ
Involvement citrus fruit volatiles in germination and growth of Penicillium digitatum and Penicillium italicum.
Volatiles emitted from wounded peel tissue of various citrus cultivars stimulated germination and germ tube elongation of bothPenicillium digitatumandPenicillium italicum, but the effect onP. digitatumappeared stronger. When exposed to volatiles from grapefruit, the percentage of germinated spores ofP. digitatumandP. italicumwas 10 and 5 fold, respectively as compared to the control.In contrast,Botrytis cinereaandPenicillium expansumwere eithernot affected or were inhibited by the peel volatiles. GS-MS analysis of volatiles present in the peel of various citrus fruit cultivars revealed that limonene is the major fruit peel volatile. Its percentageranged from 89% to 95% at the early stages of fruit development throughout the harvest season. Myrcene anda-pinene made up the second and third greatest amounts among the volatiles. All four monoterpenes, limonenea-pinene,b-pinene and myrcene stimulatedP. digitatumandP. italicumbut inhibited or had no effect onP. expansumandB. cinerea. Germ tube elongation inP. digitatumresponded most strongly to limonene and less strongly toa-pinene andb-pinene while myrcene had little effect.InP. italicum, myrcene stimulated germ tube elongation the most followed by limonene, witha-pinene, andb-pinene being about equal. Germination ofP. italicumconidia was highest in response to myrecene with the effect of the other compounds being about equal at concentrations of 5μl or more per plate.