【摘要】 1982-1985年,用放射性比强度为10μCi/ml¹⁴C-牛肉汁胨琼脂培养基标记和病菌沉积纸片液体闪烁法测定水稻白叶枯细菌。研究稻株病菌对杂草的侵染,测定出凤稗、车前等15种带菌杂草。从水稻三叶期开始,由杂草进入田水中的病菌侵染秧苗根系,沿 n+2叶片向上侵染,七叶龄后,病菌侵染稻株各器官直至发病.更多还原

【Abstract】 The Xanthomonas oryzae was grown on beef extract agar medium con- taining ¹⁴C labelled compound with specific radiaoactivity about 10 μCi/ ml,The rasioactivity of the Xanthomonas oryzae was estimated by fiter paper-liquid scintillation counting.Studies on the bacteria infection from rice seedling to weeds showed that 15 kinds of weeds such as Echinochiloa crusgalli（L） Beau V.,Plantago asi-atica L.ect.,were infected. From the begining of three-leaf-period,the bacteria from weeds infect into seedlings root,and from seedlings roots upwards throngh （n+2） leaves until the seven-leaf-period.Finally,bacteria appeared in all organs,and the disease was apparent.更多还原