摘要
对黄瓜枯萎病抗病品种长春密刺、感病品种津研四号的幼苗伤根接种后根、根 茎、茎3个部位病菌生长及组织的变化进行了观察,结果表明品种间存在明显差异.病菌从伤口进入导管后菌丝向上扩展的速度在抗病品种中较感病品种中慢,原因可能在于导管分子类型不同;抗病品种的皮层薄壁细胞间隙未观察到菌丝,表明抗病品种能抵抗病菌通过表皮的入侵.两品种都观察到木质部导管中出现侵填体、壁的覆盖物、褐色物质及皮层薄壁细胞木栓化,但这些反应在抗病品种中出现较早,表明抗病品种较早形成保卫反应.
The mycelium growth and the histological changes in root, stem base and stem of seedlings from resistant and susceptible cucumber cultivars inoculated with Fusarium oxysporum f. sp. cucumerinum were studied, and several differences were confirmed. The hypha expansion upward in the vessels of resistant cultivar was slower than that of susceptible one as result of limitation from short vessel elements. Hyphae were not found in the parenchyma cell spaces of resistant cultivar, suggesting a mechanism of resistance to infection through root epidermal layer. Tyloses, wall-coatings and brown-like materials were observed in both cultivars, but the effects occurred earlier in resistant cultivar. It indicated that the protective reactions were induced faster in resistant cultivar than that in susceptible one.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2003年第4期110-112,共3页
Journal of South China Agricultural University
