Fusarium oxysporum对苗期大豆根部的致病性和侵染规律

STUDY ON THE PATHOGENICITY AND THE INFECTION LAW OF FUSARIUM OXYSPORUM TO THE ROOT SYSTEM OF SOYBEAN DURING SEEDLING TIME

Fusarium oxysporum对苗期大豆具有较强的致病作用。病原菌自伤口或直接侵入大豆幼苗根部的皮层组织,随着病原菌的侵入和扩展,细胞出现坏死,组织发生崩解,根部组织表现红褐色病斑。环境因素对病原菌的侵染时期和在大豆体内潜育时间的长短有着明显的影响。侵染时期主要受病原菌侵入前自身所处状态和寄主的影响,侵入后潜育时间的长短则受植株状态的影响。土壤环境条件直接影响着病原菌的侵入和寄主的抗病性,间接影响着病原菌在大豆植株体内的扩展和病症的表现。

Fusarium oxysporum have a stronger pathogenicity to seedling period of soybean. .Pathogenic fungi invaded into the dermas system of seedling root directly or incursion into the plant by wound. As the invading and expending of pathogenic fungi, the cell will be died and the tissues will be necrosis. There appears to be red-brow spots on the root system of soybean. Environmental factors obviously infulenced infection period of pathogen and the length of the incubation period in soybean. The infection period is mainly effected by host itself and the status of the pathogen itself before invasion. The length of incnbation period is influenced by the status of host plant after invasion. Soil environmental condition affected both the invasion of pathogen and the resistance of the host directly and influenced the pathogen expending in plant and the symptom appearing. indirectly.