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首页> 外文期刊>Plant Pathology >Pathogenic variation of Mycosphaerella species infecting banana and plantain in Nigeria
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Pathogenic variation of Mycosphaerella species infecting banana and plantain in Nigeria

机译：尼日利亚感染香蕉和车前草的球菌种类的致病性变化

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Mycosphaerella species that cause the 'Sigatoka disease complex' account for significant yield losses in banana and plantain worldwide. Disease surveys were conducted in the humid forest (HF) and derived savanna (DS) agroecological zones from 2004 to 2006 to determine the distribution of the disease and variation among Mycosphaerella species in Nigeria. Disease prevalence and severity were higher in the HF than in the DS zone, but significant (P < 0·001) differences between agroecological zones were only observed for disease severity. A total of 85 isolates of M. fijiensis and 11 isolates of M. eumusae were collected during the survey and used to characterize the pathogenic structure of Mycosphaerella spp. using a putative host differential cultivar set consisting of Calcutta-4 (resistant), Valery (intermediate) and Agbagba (highly susceptible). Area under disease progress curve (AUDPC) was higher on all cultivars when inoculated with M. eumusae than with M. fijiensis, but significant (P < 0·05) differences between the two species were only observed on Valery. Based on the rank-sum method, 8·3% of me isolates were classified as highly aggressive and 46·9% were classified as aggressive. About 11·5% of all the isolates were classified as least aggressive, and all of these were M. fijiensis. The majority of M. eumusae isolates (seven out of 11; 64%) were classified as aggressive. A total of nine pathotype clusters were identified using cluster analysis of AUDPC. At least one M. fijiensis isolate was present in all the nine pathotype clusters, while isolates of M. eumusae were present in six of the nine clusters. Isolates in pathotype clusters HI and V were the most aggressive, while those in cluster VHI were the least aggressive. Shannon's index (H) revealed a more diverse Mycosphaerella collection in the DS zone (H = 1-81) dian in the HF (H - 1-50) zone, widi M. fijiensis being more diverse than M. eumusae. These results describe the current pathotype structure of Mycosphaerella in Nigeria and provide a useful resource that will facilitate screening of newly developed Musa genotypes for resistance against two important leaf spot diseases of banana and plantain.
机译：导致“ Sigatoka疾病复合体”的霉菌物种造成了全世界香蕉和车前草的大量减产。从2004年到2006年，在潮湿森林（HF）和衍生热带稀树草原（DS）农业生态区中进行了疾病调查，以确定该疾病的分布以及尼日利亚的霉菌属物种之间的变异。在HF地区，疾病发生率和严重程度高于DS地区，但仅在疾病严重程度方面观察到农业生态区之间的显着差异（P <0·001）。在调查过程中，共收集了85株斐济分支杆菌和eumus eumusae菌株，用于鉴定分支杆菌的致病性结构。使用由加尔各答4（抗性），瓦莱丽（中级）和阿巴格巴（高度易感）组成的推定宿主差异品种。接种富乐分支杆菌后，所有品种的病情进展曲线下面积（AUDPC）均高于斐济分支杆菌，但两个物种之间的显着差异（P <0·05）仅在Valery上观察到。根据秩和法，我分离株中有8·3％被归类为高度侵害，而46·9％被归类为具有侵略性。所有分离株中约有11·5％被归类为侵袭性最低，所有这些分离株均为斐济分枝杆菌。大部分的丁香支原体分离株（11种中有7种; 64％）被归类为侵略性。使用AUDPC的聚类分析，共鉴定出9个病理型聚类。九个病态簇中至少有一个斐济分枝杆菌分离株，而九个簇中的六个中都存在丁香分枝杆菌。病理型群HI和V中的分离株侵袭性最高，而在VHI集群中的分离株侵袭性最低。香农指数（H）揭示了在HF（H-1-50）区DS区（H = 1-81）dian中更广泛的霉菌属菌种，其中widi fi.ensis比E. eumusae更多样化。这些结果描述了尼日利亚霉菌的当前病理型结构，并提供了有用的资源，将有助于筛选新开发的Musa基因型以抵抗香蕉和车前草的两种重要叶斑病。

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