Sexual Recombinants Make a Significant Contribution to Epidemics Caused by the Wheat Pathogen Phaeosphaeria nodorum
文献类型： 外文期刊
作者： Sornmerhalder, Rubik J. 2 ; McDonald, Bruce A. 2 ; Mascher, Fabio 3 ; Zhan, Jiasui 1 ;
作者机构： 1.Yunnan Acad Agr Sci, Ind Crop Res Inst, Kunming 650205, Peoples R China
2.ETH, Inst Integrat Biol, LFW, CH-8092 Zurich, Switzerland
3.Swiss Fed Res Stn Agron, CH-1260 Changins, Nyon, Switzerland
关键词： microsatellite markers;minisatellite marker;sexual recombination;multilocus haplotype
期刊名称：PHYTOPATHOLOGY （ 影响因子：4.025； 五年影响因子：4.394 ）
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收录情况： SCI
摘要： We conducted a 2-year mark-release-recapture field experiment to quantify the relative contributions of immigration and sexual and asexual reproduction to epidemics of Stagonospora nodorum blotch caused by Phaeosphaeria nodorum. The epidemic was initiated using nine genetically distinct P nodorum isolates. Infected plants were sampled four times across two growing seasons. In total, 1,286 isolates were recovered and assayed with 10 microsatellite markers and 1 minisatellite marker.The proportion of isolates having multilocus haplotypes (MLHTs) identical to the inoculated isolates decreased steadily from 86% in the first collection to 25% in the fourth collection. The novel isolates that had different MLHTs compared with the marked inoculants originated through immigration and sexual recombination. By the end of the experiment, nearly three-quarters of the novel isolates originated from sexual recombination. Our results indicate that recombinant offspring and airborne immigrant ascospores can make significant contributions to epidemics of Stagonospora nodorum blotch during a growing season.
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