Influence of Environmental Factors on Conidial Germination of Alternaria dauci

Park, Kyeong Hun; Yun, Hye Jeong; Ryu, Kyoung Yul; Yun, Jeong Chul; Kim, Se Ri; Kim, Won Il; Kim, Doo Ho; Kwon, Young Seok; Cha, Byeong Jin

Research in Plant Disease 2011;17(3):381-385.
Published online December 30, 2011.

당근 검은잎마름병원균 Alternaria dauci의 포자 발아에 미치는 환경인자의 영향

박경훈, 윤혜정, 류경열, 윤종철, 김세리, 김원일, 김두호, 권영석, 차병진

Influence of Environmental Factors on Conidial Germination of Alternaria dauci

Kyeong Hun Park, Hye Jeong Yun, Kyoung Yul Ryu, Jeong Chul Yun, Se Ri Kim, Won Il Kim, Doo Ho Kim, Young Seok Kwon, Byeong Jin Cha

Abstract

Effects of temperatures, relative humidity, pH, and dry periods on conidial germination of Alternaria dauci were evaluated under in vitro conditions. Conidial germination was accelerated at over 95% relative humidity in 15oC to 25oC condition. Conidial germination was rapidly reduced at 5 regardless of relative humidity conditions. More than 50% of the conidial germination were initiated within 2 h at 25oC through pH 5 to 7. The highest conidial germination of A. dauci was on 0.2% of carrot leaf extract. Conidia could survive longer than 12 h, even though its germination decreased. After a 12 h dry period, around 10% of conidia revived and germinated when conidia were hydrated again. These results could be used as the useful information on conidial germination of A. dauci and ecology of Alternaria leaf blight.

Key Words: Alternaria Leaf blight, Daucus carota, Environmental factor, Spore germination