南方根结线虫和香蕉枯萎病菌4号生理小种对香蕉复合致病力的测定

Virulence of Meloidogyne incognita and Fusarium oxysporum f.sp.cubense race 4 complex on bananas

通过室内盆栽接种测试的方法,测定南方根结线虫(Moidogyne incognita)和香蕉枯萎病菌4号生理小种(Fusarium oxysporumf.sp.cubense race 4)对香蕉2个感枯萎病品种(巴西蕉和大蕉)和抗枯萎病品种(农科1号)的复合致病力。结果表明:对于供试的感病品种,先接种南方根结线虫能显著减轻香蕉枯萎病的发病程度;同时接种2种病原物和先接种香蕉枯萎病菌5d后接种南方根结线虫能加重香蕉枯萎病的发展;复合侵染能抑制南方根结线虫的种群数量,其中先接种香蕉枯萎病菌和同时接种2种病原物对南方根结线虫种群数量抑制作用更大;对于抗病的品种农科1号,2种病原物的同时接种能导致香蕉对枯萎病抗性的部分丧失。

The virulence of Meloidogyne incognita and Fusarium oxysporum f. sp. cubense race 4 （Foc 4） complex in pot experiments was measured on two Foc 4-susceptible banana cultivars （Baxi and Musa paraolisiaca） and one Foc 4-resistant banana cultivar （Nongke No. 1） by inoculating simultane- ously and sequentially in greenhouse. Results showed that fusarium wilt severity was significantly re- duced when the nematode was inoculated before the fungus, and increased when the two pathogens were inoculated simultaneously or the fungus was introduced 5 days before the nematode. The final number of M. incognita was reduced in all the banana cultivars inoculated with the two pathogens. The fungus in- oculation before the nematode and concomitant inoculation had a better suppression of nematode population. In Foc 4-resistant cultivar, resistance was stable in all the tested except for those inoculated with the two pathogens simultaneously.