杨树溃疡病菌致病力变异研究

Pathogenic variation of Botryospaeria dothidea causing poplar canker

以2株溃疡病菌株及其亚硝酸盐诱变菌株、异核体菌株接种苹果进行致病性测定,经方差分析和多重比较表明,溃疡病菌致病力变异可由亚硝酸盐诱变、异核体产生。强毒株的nit株致病力分化差异显著,可产生较野生菌株毒力更强的株系;弱毒菌株的nit株致病力分化差异不显著,致病力均较野生菌株弱;异核体菌株之间致病力差异不显著,平均毒力比亲本菌株小,有的与强毒亲本致病力差异显著,无“异核体优势”。

By inoculation on apple with 2 wild canker pathogens ano their nitrite isolations and heterokaryotic isolations, the pathogenicity was got and analyzed by variance and multiple comparisons. The virulence might derive from nit mutant and heterokaryon. The nit isolations derived from strong virulent wild pathogens might have strong virulence and have significant difference virulence within them,while this was not true among weak virulent pathogens. No significant difference were found among heterokaryotic isolations and their mean pathogenicity was more weak than their parental isolations, no heterokaryotic advantage existed among those tested isolations.