Changing Ploidy as a Strategy: The Irish Potato Famine Pathogen Shifts Ploidy in Relation to Its Sexuality

文献类型： 外文期刊

第一作者： Li, Ying

作者： Li, Ying;Shen, He;Zhou, Qian;Qian, Kun;Huang, Sanwen;Zhou, Qian;Huang, Sanwen;van der Lee, Theo

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期刊名称：MOLECULAR PLANT-MICROBE INTERACTIONS （ 影响因子：4.171； 五年影响因子：4.836 ）

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收录情况： SCI

摘要： The oomycete Phytophthora infestans was the causal agent of the Irish Great Famine and is a recurring threat to global food se-curity. The pathogen can reproduce both sexually and asexually, with high potential to adapt to various environments and great risk to break disease resistance genes in potato. As are other oomycetes, P infestans is regarded to be diploid during the veg-etative phase of its life cycle, although some studies reported trisomy and polyploidy. Using microsatellite fingerprinting, genome-wide assessment of single nucleotide polymorphisms, nuclear DNA quantification, and microscopic counting of chro-mosome numbers, we assessed the ploidy level of a comprehe-nsive selection of isolates. All progenies from sexual populations of P. infestans in nature were found to be diploid, in contrast nearly all dominant asexual lineages, including the most important pandemic clonal lineages US-1 and 13_A2 were triploid. Such triploids possess significantly more allelic variation than diploids. We observed that triploid genotype can change to a diploid genome constitution when exposed to artificial stress conditions. This study reveals that fluctuations in the ploidy level may be a key factor in the adaptation process of this notorious plant de-stroyer and imposes an extra challenge to control this disease.

分类号： Q94

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