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KMID : 0379119930210030224
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Korean Journal of Mycology
1993 Volume.21 No. 3 p.224 ~ p.229
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Effect of Temperature on the Conidium Germination and Appressorium Formation of Colletotrichum acutatum , C. dematium and C. gloeosporioides
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Abstract
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The optimum temperature for germination of conidia and germ tube elongation were between 20 and 30℃ in C. dematium and C. gloeosporioides. Appressoria were fairly formed well at 20℃ despite the delay of conidial germination. At 30℃, both the germination and germ tube elongation are favored, but appressoria were poorly detected to be formed. In C. acutatum, the optimum temperature for germination of conidia was from 20 to 30℃, but at 25℃, germ tube elongation are accelerated. The conidia become septate and one or both doughter cells become conidiogenous instead of producing germ tubes and a secondary conidia produced, resulting in an arborescent type of connected conidia. Appressoria are infrequently formed by germinating conida. At 20 to 25℃ was the optimum for appressorium formation. But conidia that germinated at 30℃ seemed to lose the ability to form appressoria.
The relation of temperature to germination of conidia and appressorium formation in Colletotrichum acutatum, C. dematium and C. gloeosporioides are discussed.
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