Chang Seog Won, Hwang Byung Kook
Northern Agricultural Research Station, Gyeonggido Agricultural Research and Extension Services, Yonchon 486-833, Korea.
Laboratory of Molecular Plant Pathology, College of Life and Environmental Sciences, Korea University, Seoul 136-701, Korea.
Plant Dis. 2003 Jun;87(6):726-731. doi: 10.1094/PDIS.2003.87.6.726.
The virulence of 33 isolates of Bipolaris coicis from diverse geographic origins in Korea was evaluated on six adlay cultivars or lines under controlled environmental conditions. To evaluate infection levels of B. coicis isolates in adlay plants, a 10-class disease rating scale was developed based on the qualitative and quantitative differences of lesions on adlay leaves infected. There were significant differences in virulence among isolates of B. coicis, although the differences were quantitative rather than qualitative. Significant differences also were observed among cultivar-isolate interactions in the analysis of variance. All isolates of B. coicis, except KG-9515, were pathogenic on adlay plants. BC-20136, the most virulent isolate, was capable of causing highly susceptible reactions on the adlay cultivars or lines. Significant differences in levels of resistance were found among six adlay cultivars or lines tested. The disease rating scale may be a reliable criterion to evaluate a large number of adlays for resistance to leaf blight or B. coicis isolates for virulence to adlays.
在可控环境条件下，对来自韩国不同地理区域的33株薏苡离蠕孢菌分离株，在6个薏苡栽培品种或品系上评估其毒力。为评估离蠕孢菌分离株在薏苡植株中的感染水平，基于感染的薏苡叶片上病斑的定性和定量差异，制定了一个10级病害评级量表。离蠕孢菌分离株之间的毒力存在显著差异，尽管这些差异是数量上的而非质量上的。在方差分析中，品种 - 分离株相互作用之间也观察到显著差异。除KG - 9515外，所有离蠕孢菌分离株对薏苡植株均具有致病性。毒性最强的分离株BC - 20136能够在薏苡栽培品种或品系上引起高度敏感反应。在所测试的6个薏苡栽培品种或品系中，发现抗性水平存在显著差异。该病害评级量表可能是评估大量薏苡对叶枯病抗性或离蠕孢菌分离株对薏苡毒力的可靠标准。
