Anthracnose of Amaranthus mangostanus Caused by Glomerella cingulata in Korea

Symptoms similar to anthracnose were observed on Amaranthus mangostanus in Sancheon-gun, Gyeongnam province, where the plants were autogenously formed community. The symptoms were appeared in stem and spread, eventually whole plants died. Mycelial colony of the isolate was whitish gray to dark gray on potato dextrose agar. Conidia were single celled, colorless, cylindrical and measured as $10.5{\sim}21.7{\times}3.8{\sim}6.0{\mu}m$. Appressoria were dark brown, ovate to obovate and sized as $5.6{\sim}13.7{\times}4.6{\sim}11.4{\mu}m$. Perithecia were brown to black in color and shaped as globose to obpyriform and sized as $79.7{\sim}286.7{\mu}m$. Asci had eight ascospores and sized as $47.7{\sim}89.7{\times}8.1{\sim}13.3{\mu}m$. Ascospores were slightly curved at the center cylindrical, fusiform and measured $9.3{\sim}20.3{\times}4.6{\sim}6.3{\mu}m$. Optimum temperature for growth was $30^{\circ}C$. On the basis of morphological characteristics and pathogenicity test to host plants, the fungus was identified as Glomerella cingulata. This is the first report on the Anthracnose of Amaranthus mangostanus caused by Glomerella cingulata in Korea.

Glomerella cingulata에 의한 비름 탄저병

2002년 9월 경상남도 산청군 비름 군락지에서 줄기에 탄저병이 발생하였다. 분리된 병원균의 PDA 배지에서 균총은 회색이고 배지상에서 자낭을 형성하였다. 분생포자 모양은 단세포로 원통형이며 크기는 $10.5{\sim}21.7{\times}3.8{\sim}6.0{\mu}m$였다. 부착기 모양은 원통형 또는 난형으로 암갈색을 띠고 크기는 $5.6{\sim}13.7{\times}4.6{\sim}11.4{\mu}m$였다. 자낭각의 색깔은 검은색으로 구형이며 크기는 $79.7{\sim}286.7{\mu}m$였다. 자낭은 8개이며 모양은 곤봉 또는 원통형이며 크기는 $47.7{\sim}89.7{\times}8.1{\sim}13.3{\mu}m$였다. 자낭포자는 방추형 또는 원통형으로 약간 굽었으며 크기는 9.3{\sim}20.3{\times}4.6{\sim}6.3{\mu}m$였다. 분리된 병원균을 건전한 비름에 접종한 결과 감염을 일으켰으며 병징은 같았다. 이 병원균을 Glomerella cingulata에 의한 비름 탄저병으로 명명할 것을 제안한다.