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从太平洋地区和南美洲采集到的香蕉叶斑病菌.Mycosphaerella musicola在中美洲和南美洲均有分布,洪都拉斯还发生M.fijiensis、var.difformis.在斐济、汤加群岛、纽西兰的萨摩群岛、科克群岛、Niue、所罗门群岛、巴布亚新几内亚和台湾也发现到这种叶斑病.M.fijiensis仅发生在夏威夷和菲律宾.在太平洋地区,从马来西亚附近的坡哥、爪哇和吉隆坡采集的材料也观察到M.musicola.单子囊孢子分离培养证明:Mycosphaerella fijiensis和M.fijiensis vardifformis形成一种单独难以辨别的培养型,而M.fijiensis形成一种明显可辨的培养型.在单子囊孢子分离中,培养的变异性M.fijiensis型比M.musicola型大得多.M.fijiensis在Mycophyl琼脂中产生两种主要培养型:一种是带有圆齿状边缘暗灰色的或灰褐色的菌落(DGB),另一种是淡灰色的和粉红色的菌落(PGP).刚分离培养时,产生大量分生孢子为DGB培养型.培养时间长了,变得不稳定而转变成PGP培养型.
Banana leaf spot harvested from the Pacific and South America, Mycosphaerella musicola distributed in Central and South America, M.fijiensis, var.difformis in Honduras, and in Fiji, Tonga, New Zealand’s Samoa, The leaf spot is also found in the islands of Cork, Niue, Solomon Islands, Papua New Guinea and Taiwan, and M. fijiensis occurs only in Hawaii and the Philippines. In the Pacific Ocean, materials collected from Pokot, Java and Kuala Lumpur near Malaysia M.musicola was also observed. Isolation of ascospores revealed that Mycosphaerella fijiensis and M.fijiensis vardifformis formed a distinctly indistinguishable culture, whereas M.fijiensis formed a clearly distinguishable culture. In isolated ascospores , The variability of culture M.fijiensis is much larger than that of M.musicola.M.fijiensis produces two major culture forms on Mycophyl agar: one is a dark gray or beige colony with scalloped edges (DGB), and the other is light gray and pink colonies (PGP) .After freshly isolated and cultured, a large number of conidia produced DGB culture type.Culture time is long, variable Unstable and transformed into PGP culture.