Abstract
2007년 7월 전북 전주의 식물원에서 판매중인 아이비에서 줄기와 잎이 갈색으로 썩으며 급격히 말라죽는 증상으로부터 병원균을 분리 동정한 결과 Phytophthora nicotianae로 동정되었다. 병원균의 형태적 특성은 유두돌기가 있고 탈락성이 없는 난형의 유주자낭을 형성하였고, 크기는 평균 <TEX>$35.4{\times}25.2{\mu}m$</TEX>었고, 구형의 후막포자를 다량 형성하였으며, 크기는 평균 직경이 28.5 <TEX>${\mu}m$</TEX>였다. 유성생식형은 자웅이주로 A1 mating type이 관찰되었고 난포자의 크기는 평균 직경이 23.3 <TEX>${\mu}m$</TEX>였다. 균사의 생육적온은 <TEX>$25{\sim}30^{\circ}C$</TEX>였다. P. nicotianae에 의한 아이비줄기썩음병의 발생은 국내에서는 처음이다. A stem and leaf rot disease of English ivy(Hedera helix) was found in the flower market, Jeonju, Chonbuk province, Korea in July 2007. A Phytophthora species was isolated from the diseased part of the plant. Based on the mycological properties and pathogenesis the isolate was identified as Phytophthora nicotianae. The fungus produce ovoid sporangium which was ovoid to spherical which is noncaducous, papillate and averaged <TEX>$35.4{\times}25.2{\mu}m$</TEX> in dimension. Chlamydospores were abundantly produced on agar media and sized about 28.5 <TEX>${\mu}m$</TEX> in diameter. The fungus was heterothallic and A1 mating type. Oospores were measured 23.3 <TEX>${\mu}m$</TEX> in size. Optimum temperature for growth of the fungus was 25 to <TEX>$30^{\circ}C$</TEX>. Up to our knowledge, this is the first report demonstrating the stem rot on English ivy caused by P. nicotianae in Korea.
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