KERWIN, J. L. 1984. Fatty acid regulation of the germination of Erynia vnriabilis conidia on adults and puparla of the lesser housefly, Fannia car~icularis. . Conidia of the entomogenous fungus Eqlnin varinbilis germinate vegetatively on the cuticular surface of adults of the lesser housefly, Fannia caniculnris, and on a basal agar growth medium in which cuticular lipid extracts of adult flies have been incorporated. Formation and discharge of secondary spores occur on puparial cuticles and on media in which puparial cuticle lipid extracts have been included. Relative free fatty acid compositions of puparial and adult cuticle lipid extracts are nearly identical, but adults average ca. five times the concentration of free fatty acids on their cuticle surface as that found on puparia. A regulatory role for esterified fatty acids in conidial germination is suggested. Limitation of E. variabilis to adult dipteran hosts is postulated to be due in part to characteristics of the fatty acids of this order of insects: the presence of sufficient oleic acid to induce germination; high levels of palmitoleic acid to enhance mycelial growth; and low levels of linoleic and linolenic acids, which have deleterious effects on spore germination and mycelial proliferation. KERWIN, J . L. 1984. Fatty acid regulation of the germination of Erynin variabilis conidia on adults and puparia of the lesser housefly, Fannia canicularis. Can. J . Microbiol. 30: 158-161.Les conidies d'Erynia variabilis, un champignon entomogkne, germent de f a~o n vtgCtative 5 la surface de la cuticle chez la mouche commune adulte Fannia canicularis ainsi que sur une gClose nutritive dans laquelle des lipides extraits de la cuticule de mouches adultes ont CtC incorporCs. La formation et la IibCration des spores secondaires se font sur les cuticules pupariales ainsi que sur les milieux dans lesquels des lipides extraits de cuticules pupariales ont CtC incorpores. Les compositions relatives en acides gras libres des lipides extraits de cuticules pupariales et adultes sont a peu prks identiques, mais la concentration en acides gras libres est en moyenne cinq fois plus ClevCe a la surface de cuticules adultes comparativement a des cuticules pupariales. On peut croire que les acides gras estCrifiCs auraient un r6le de rCgulation dans la germination des conidies. Le fait que E. variabilis ait comme hates exclusifs des diptkres adultes serait en partie attribuable aux caractCristiques des acides gras rencontrCs chez cet ordre d'insectes: prCsence d'acide olCique en quantitC suffisante pour induire la germination; niveau ClevC d'acide palmitolCique favorisant la croissance du mycelium et faible concentration d'acides IinolCique et IinolCnique qui ont ~ ~ des effets nuisibles sur la germination des spores. [Traduit par le journal]
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