Effect of Conidial Number and Nutrition on the Germination of Conidia in Colletotrichum dematium f. sp. capsicum Causing Red Pepper Anthracnose

분생포자수(分生胞子數) 및 영양상태(營養狀態)가 고추 탄저병균(炭疽病菌)(Colletotrichum dematium f. sp. capsicum)의 분생포자(分生胞子) 발아(發芽)에 미치는 영향(影響)

  • Chung, Bong-Koo (Dept. of Agricultural Biology, College of Agric., Chung Buk Nat'l. University) ;
  • Lee, Sang-Bum (Dept. of Agricultural Biology, College of Agric., Chung Buk Nat'l. University)
  • 정봉구 (충북대학교 농과대학 농생물학과) ;
  • 이상범 (충북대학교 농과대학 농생물학과)
  • Published : 1986.04.30

Abstract

Exogenous factor and nutrients affecting for conidial germination of Colletetrichum dematium f. sp. capsicum causing red pepper anthracnose were studied by slide germination test. Optimum temperature of conidial germination was at $28^{\circ}C$, ranging 15 to $35^{\circ}C$. Optimum pH was at 5.5, ranging 4.5 to 8.0, and more than 90% of relative humidity (RH) was optimum. Poor conidial germination of the fungus was observed on sterile distilled water, but potato sucrose broth (PSB), red pepper fruit broth (RPFB), green pepper fruit broth (GPFB) and pepper leaf broth (PLB) furnished a satisfactory nutrients for conidial germination. Exogenous supply of carbon and nitrogen sources were essential for conidial germination, while potassium, phosphorous and sulfur were not evident as that for carbon and nitrogen. Soluble starch was the most suitable as a carbon source for conidial germination and followed by D-glucose, D-galactose and lactose in that order. Maximum germination was attained in the $1{\times}10^4$ conidia per ml. Germination was decreased with increment of conidial concentration, and in the density of $5{\times}10^4$ conida per ml, germination was nearly supipressed. It suggested existing a self-inhibitor. Non-washed conidia germinated more than washed conidia, and conidial germination was also gradually decreased by increasing conidial density.

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