|Title:||水稻紋枯病菌單擔胞子菌株間之培養性狀、抗藥性和病徵型之比較||Other Titles:||Culture Characteristics, Chemical Tolerance and Symptom Types of Single-Basidiospore Isolates of Thanatephorus Cucumeris||Authors:||杜金池
|Issue Date:||3-Mar-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||1||Start page/Pages:||13-22||Source:||中華農業研究||Abstract:||
Seventeen single-basidiospore isolates were isolated from the hymenial layer of Thanatephorus cucumeris produced on the mature jute stem in the field. These isolates showed great variations on hyphal growth rate, PH value changes of culture medium, colony color, and sclerotial formation. The parent clone showed a moderate tolerance to penta-chloronitrobenzen (PCNB) with 42-66% of growth inhibition at the concentrations of 100-4,000 ppm. However, 2 single-basidiospore isolates showed the same degree of PCNB tolerance as the parent clone, 4 isolates lower, and the rest 11 isolates higher than the parent.
All single-basidiospore isolates as well as the parent clone were pathogenic to jute seedlings showing typical symptoms of seedling damping-off. These isolates were also pathogenic to rice plants but with variable symptoms. The symptoms on rice plants could be grouped into 3 types: seven isolates and the parent clone showed the typical sheath blight spot, 4 isolates produced sheah blight-like spot with grayish-brown color in the central part, and the rest 6 isolates produced rod-like brown spot with yellowish-brown margin. Since the variations are too great among single-basidiospore isolates, it is, therefore, concluded that neither culture characteristic nor symptom type can be served to distinguish strains of T. cucumeris.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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