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首页> 外文期刊>Journal of Phytopathology >Characterization of Italian isolates of Fusarium semitectum from alfalfa (Medicago sativa L.) by AFLP analysis, morphology, pathogenicity and toxin production.
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Characterization of Italian isolates of Fusarium semitectum from alfalfa (Medicago sativa L.) by AFLP analysis, morphology, pathogenicity and toxin production.

机译：通过AFLP分析，形态学，致病性和毒素产生，对苜蓿（Medicago sativa L.）苜蓿镰刀菌意大利分离株进行表征。

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Fusarium semitectum is a widespread species often isolated from plants with complex disease and also known to be toxigenic. Twenty-seven isolates of F. semitectum obtained from wilted plants of Medicago sativa grown in northern Italy were analysed by Amplified Fragment Length Polymorphisms (AFLP). The isolates were divided in two distinct clusters, coded A and B. Investigations were carried out on morphology, pathogenicity on alfalfa seedlings and toxin production of 18 isolates representative of the two AFLP clusters. Isolates from cluster A showed fast growth and pale peach colour of the colonies on potato-dextrose-agar, whereas those from cluster B showed slow growth and orange pigmentation, changing to brown with age. Length of 5-septate macroconidia was higher in isolates from cluster A and the frequency of classes of conidia septation was statistically different between the two clusters. All isolates from cluster A were pathogenic to alfalfa, whereas those from cluster B were mostly non-pathogenic. The mycotoxigenic profiles were distinct between the two clusters and similar within the same cluster: isolates from cluster A produced zearalenone, alone or together with diacetoxyscirpenol, whereas isolates from cluster B produced deoxyfusapyrone. The results showed that there is a good correspondence between the AFLP clustering and the distinction of F. semitectum isolates from alfalfa into two groups based on morphology, pathogenicity and toxin-production..
机译：半镰刀菌（Fusarium semitectum）是一种普遍存在的物种，通常从具有复杂病害的植物中分离出来，并且也具有产毒性。通过扩增片段长度多态性（AFLP）分析了从意大利北部种植的紫花苜蓿的枯萎植物中获得的27株半裸镰刀菌。将分离物分为两个不同的簇，分别编码为A和B。对代表两个AFLP簇的18种分离株的形态，致病性以及苜蓿的病原菌进行了研究。来自群A的分离物在马铃薯-葡萄糖-琼脂上显示出快速生长的菌落和淡桃色菌落，而来自群B的分离物显示缓慢的生长和橙色色素沉着，随着年龄的增长变成棕色。从群集A分离出的5个间隔的大分生孢子的长度较高，并且在两个群集之间，分生孢子分隔类别的频率在统计学上是不同的。来自群A的所有分离株均对苜蓿具有致病性，而来自群B的分离物则大多无致病性。在两个簇之间，致毒毒素谱是不同的，并且在同一簇中相似：从簇A分离出的玉米赤霉烯酮，单独或与二乙酰氧基松柏醇一起生产，而从簇B分离出的脱氧呋喃莎酮。结果表明，基于形态学，致病性和毒素产生，AFLP聚类与苜蓿苜蓿半隐叶蝉分离株分为两组之间有很好的对应关系。

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