A survey was conducted in southern Alberta, Canada, to collect Fusarium stalk rot and Fusarium head blight (FHB) disease samples from corn and wheat fields, respectively, with an aim to understand the diversity in the population of Fusarium graminearum. From 77 wheat and 80 corn samples, 79 isolates of F. graminearum were obtained. These 79 isolates were evaluated for their growth rate, sporulation ability, pathogenicity and trichothecene genotype. Eighty-two percent of the isolates were recovered from corn, which suggests corn residue may be better suited than wheat for perpetuating the FHB pathogen. Three genotypes with potential of producing 3-ADON, 15-ADON and NIV were present in the population, and among them, 15-ADON producing genotype was predominant, and 3-ADON genotype produced more spores than the 15-ADON genotype. The proportion of 3-ADON genotype is increasing overtime in Alberta. The impact of increasing population of 3-ADON genotype is worthy of to be monitored for the management of FHB. There were variations in the population of F. graminearum isolates for growth rate, sporulation and pathogenicity but revealed no association among the parameters suggesting other factors like host susceptibility and environment play a significant role in the development of FHB.

中文翻译：

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加拿大艾伯塔省从小麦和玉米中分离的禾本科镰刀菌种群的多样性

在加拿大艾伯塔省南部进行了一项调查，分别收集了玉米田和麦田的镰刀菌腐烂病和镰刀菌疫病样本，目的是了解禾谷镰刀菌种群的多样性。从77个小麦和80个玉米样品中分离出79个分离的禾谷镰刀菌获得了。对这79株分离株的生长速度，孢子形成能力，致病性和单端孢菌素基因型进行了评估。从玉米中回收了82％的分离株，这表明玉米残留物可能比小麦更适合保留FHB病原体。人群中存在三种可能产生3-ADON，15-ADON和NIV的基因型，其中以产生15-ADON的基因型为主，并且3-ADON的基因型比15-ADON的基因型多。在阿尔伯塔省，3-ADON基因型的比例随着时间的推移而增加。应对FHB的治疗监测3-ADON基因型种群的增加所带来的影响是值得监测的。禾谷镰刀菌的种群有差异 分离株的生长速度，孢子形成和致病性，但没有显示参数之间的关联，表明其他因素（如宿主易感性和环境）在FHB的发生中起重要作用。