Silva Rhaphael A, Ferro Camila G, Lehner Miller da S, Paula Trazilbo J, Mizubuti Eduardo S G
Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
Empresa de Pesquisa Agropecuária de Minas Gerais, Viçosa, Minas Gerais, 36570-000, Brazil.
Plant Dis. 2021 Nov;105(11):3376-3384. doi: 10.1094/PDIS-01-21-0110-RE. Epub 2021 Nov 7.
The genetic structure of the population of was analyzed using 238 individuals collected from different hosts. Individuals were characterized for microsatellite genotypes and mycelial compatibility groups (MCGs). A total of 22 MCGs and 64 multilocus lineages (MLLs) were identified. There was a close relationship between the MCGs and MLLs, but there was no association between MLLs and hosts or regions. At least 39 MCGs are present in Brazil, and 68.5% of the isolates were assigned to either MCG 1 or MCG 2. Eight new MCGs were found. Seven genetic groups were identified and associated with MCGs. Most genetic variation (70.0%) was because of differences among MCGs. High values of estimates of linkage disequilibrium among loci were more frequent in the total population (all MCGs). By contrast, there was evidence of random mating in subpopulations defined by MCGs 1 and 2. Additionally, there was evidence of outcrossing in the population of . in Brazil. The population was structured by MCGs; lineages originating from asexual reproduction or selfing prevail and are widely distributed in space, are persistent in time, and affect many hosts, but there is evidence of some degree of outcrossing, which may lead to a more genetically variable population in the future.
利用从不同宿主收集的238个个体分析了该种群的遗传结构。对个体进行微卫星基因型和菌丝体相容性群（MCG）特征分析。共鉴定出22个MCG和64个多位点谱系（MLL）。MCG和MLL之间存在密切关系，但MLL与宿主或地区之间没有关联。巴西至少存在39个MCG，68.5%的分离株被归为MCG 1或MCG 2。发现了8个新的MCG。鉴定出7个遗传组并与MCG相关联。大多数遗传变异（70.0%）是由于MCG之间的差异。在总群体（所有MCG）中，位点间连锁不平衡估计值的高值更为常见。相比之下，在由MCG 1和MCG 2定义的亚群体中有随机交配的证据。此外，在巴西的该种群中有异交的证据。该种群由MCG构成；源自无性繁殖或自交的谱系占主导地位，在空间上广泛分布，在时间上持续存在，并影响许多宿主，但有证据表明存在一定程度的异交，这可能导致未来种群具有更大的遗传变异性。
