棉花枯萎病菌接种及粗毒素处理后棉苗维管束病理特征

 利用遗传背景一致而抗病性不同的岱16变异品系和抗病品种中12,研究了接种棉花枯萎病菌(Fusarium oxysporum f.sp.vasinfectum)及用枯萎病菌粗毒素处理后,棉苗维管束的病理变化。研究结果表明,接种枯萎病菌后,病株茎部导管及薄壁细胞中有枯萎菌丝存在。发病严重的感病品种原岱16有菌丝的导管数最多,抗病品种早熟岱16抗最少。所有品种中均出现胶状物或侵填体堵塞导管,这种现象在抗病品种中更为明显。病菌粗毒素处理后,棉苗茎及叶柄导管内也出现侵填体或胶状物堵塞导管,抗病品种茎部导管堵塞快。

CHARACTERISTICS OF VASCULAR IN COTTON SEEDLING TREATED BY FUSARIUM WILT FUNGUS AND ITS TOXINS

Studies on pathological changes of vascular in cotton seedling inoculated with Fusarium oxysporum f.sp. vasinfectum or treated with its crude toxins was carried out on resistant cultivar Zhong 12 and DPL16 variants which were on same genetic background. The results showed that mycelia were present in the vessels and parenchyma in stems after inoculation. Susceptible cultivar DPL16 had highest amount of infected vessels while the resistant cultivar Zaoshu DPL16 had the fewest infected vessels. The tylose and gum in vessels could be seen in all cultivars but their frequency of occurrence was higher on resistant cultivar. The tylose and gum also could be seen in stem or petiole after treated by crude toxins also,the resistant cultivar produced occlusion in vessels more quickly than susceptible ones.