The purpose of this study was to characterize Phytophthora infestans isolates obtained from diseased tomato tissue in Oman from 2013 to 2015. Late blight caused severe epidemics on tomatoes in Oman in 2013–2014 and 2014–2015. Prior to 2013, late blight had not previously been reported from Oman. Isolates collected from diseased tomato plants in commercial production fields in Oman were assayed for a series of traits. All fifty-five isolates tested for mating type were determined to be A1. A subset of nine isolates analysed for allozymes, sensitivity to mefenoxam, DNA fingerprint as detected with random genome probe fifty-seven (RG57), and microsatellite genotypes revealed a diverse population. A range of sensitivity to mefenoxam was observed and one multi-locus genotype (MLG) was detected in four of the nine isolates. The A2 strain Blue_13, which was recently identified in India and thought to be a possible source of the pathogen, was not detected.

中文翻译：

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2013-2015年阿曼致病疫霉外观及多样性

本研究的目的是表征 2013 年至 2015 年从阿曼患病番茄组织中获得的致病疫霉分离株。晚疫病在 2013 年至 2014 年和 2014 年至 2015 年期间在阿曼造成了严重的西红柿流行病。在 2013 年之前，阿曼之前没有报道过晚疫病。对从阿曼商业生产田中的患病番茄植物收集的分离株进行了一系列性状分析。测试交配型的所有 55 个分离株都被确定为 A1。分析了等位酶、对甲芬诺胺的敏感性、使用随机基因组探针 57 (RG57) 检测到的 DNA 指纹和微卫星基因型的 9 个分离株的子集显示了不同的种群。观察到对甲芬诺胺的一系列敏感性，并且在九个分离株中的四个中检测到一个多位点基因型 (MLG)。A2 菌株 Blue_13，