The aim of this work was to study further the population of Fulvia fulva [syn. Cladosporium fulvum, Passalora fulva] in Argentina particularly in terms of diversity at the genetic level by means of ISSR. Also, we studied polymorphisms within avr and ecp sequences, what incidentally might lead to the development of new races. Argentinian tomato cultivars only are affected by two races of F. fulva and the data we provide here indicates that the populations of these two races are under an evolutionary process. Representatives of them had several polymorphisms within the coding sequences of effectors, but they are not constrained to avr genes, probably because, based on field data, resistant cultivars are not available. Most polymorphisms observed in avr and ecp genes were deletions or insertions (INDELs) or single nucleotide polymorphisms (SNPs). Therefore, probably the environment and management practices are the most important factors driving evolution of these races in Argentina and this might explain why the pathogen population is not driven at the pathogenic or race level.

这项工作的目的是进一步研究富叶紫花苜蓿[syn。特别是在阿根廷，Clustsporium fulvum（Passalora fulva），通过ISSR在遗传水平上具有多样性。另外，我们研究了avr和ecp序列内的多态性，这可能会导致新种族的发展。阿根廷番茄品种仅受两个ful。Fful菌种的影响，我们在此处提供的数据表明这两个菌种的种群处于进化过程中。它们的代表在效应子的编码序列内具有多个多态性，但是它们并不局限于avr基因，可能是因为根据田间数据无法获得抗性品种。在avr和ecp基因中观察到的大多数多态性是缺失或插入（INDEL）或单核苷酸多态性（SNP）。因此，环境和管理实践可能是推动这些种族在阿根廷进化的最重要因素，这也许可以解释为什么病原体种群没有在病原体或种族水平上受到驱动。