Forsyth Leanne M, Smith Linda J, Aitken Elizabeth A B
School of Integrative Biology, The University of Queensland, Level 5 John Hines Building (62), St Lucia, QLD 4072, Australia.
Mycol Res. 2006 Aug;110(Pt 8):929-35. doi: 10.1016/j.mycres.2006.03.008. Epub 2006 Aug 7.
Fusarium wilt of banana is a potentially devastating disease throughout the world. Options for control of the causal organism, Fusarium oxysporum f.sp. cubense (Foc) are limited. Suppressive soil sites have previously been identified where, despite the presence of Foc, Fusarium wilt does not develop. In order to understand some aspects of this disease suppression, endophytic Fusarium oxysporum isolates were obtained from banana roots. These isolates were genetically characterized and compared with an isolate of Fusarium oxysporum previously identified as being capable of suppressing Fusarium wilt of banana in glasshouse trials. Three additional isolates were selected for glasshouse trials to assess suppression of Fusarium wilt in two different cultivars of banana, Cavendish and Lady Finger. One isolate (BRIP 29089) was identified as a potential biocontrol organism, reducing the disease severity of Fusarium wilt in Lady Finger and Cavendish cultivars. Interestingly, one isolate (BRIP 45952) increased Fusarium wilt disease severity on Cavendish. The implications of an isolate of Fusarium oxysporum, non-pathogenic on banana, increasing disease severity and the potential role of non-pathogenic isolates of Fusarium oxysporum in disease complexes are discussed.
香蕉枯萎病是一种在全球范围内具有潜在毁灭性的病害。控制病原菌尖孢镰刀菌古巴专化型（Foc）的方法有限。此前已发现一些抑制性土壤位点，尽管存在Foc，但香蕉枯萎病并未发生。为了了解这种病害抑制的某些方面，从香蕉根部分离出内生尖孢镰刀菌菌株。对这些菌株进行了基因特征分析，并与之前在温室试验中被鉴定为能够抑制香蕉枯萎病的尖孢镰刀菌菌株进行了比较。选择另外三个菌株进行温室试验，以评估其对两个不同香蕉品种（卡文迪什和手指蕉）枯萎病的抑制作用。其中一个菌株（BRIP 29089）被鉴定为一种潜在的生物防治菌，可降低手指蕉和卡文迪什品种中香蕉枯萎病的病情严重程度。有趣的是，一个菌株（BRIP 45952）增加了卡文迪什香蕉枯萎病的病情严重程度。本文讨论了一种对香蕉无致病性的尖孢镰刀菌菌株增加病害严重程度的影响以及尖孢镰刀菌非致病菌株在病害复合体中的潜在作用。
