Skip to main content
ARS Home » Midwest Area » East Lansing, Michigan » Sugarbeet and Bean Research » Research » Publications at this Location » Publication #363435

Research Project: Genetic Characterization for Sugar Beet Improvement

Location: Sugarbeet and Bean Research

Title: Utilization of microsatellites for Rhizoctonia solani AG2-2 population genetics

item MINIER, DOUGLAS - Michigan State University
item Hanson, Linda

Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2019
Publication Date: 10/1/2019
Citation: Minier, D.H., Hanson, L.E. 2019. Utilization of microsatellites for Rhizoctonia solani AG2-2 population genetics [abstract]. American Phytopathological Society. 109(10S):S170.

Interpretive Summary:

Technical Abstract: Rhizoctonia solani AG2-2 causes Rhizoctonia root and crown rot of sugarbeet (Beta vulgaris) as well as root rots of several other economically important crops. We have developed a set of microsatellite markers to examine diversity and population structure in R. solani AG2-2. We are utilizing these markers to investigate R. solani AG2-2 diversity at varying geographic levels and among isolates recovered from sugarbeet and several rotation crops. To examine the distribution of AG2-2 genotypes in Michigan fields, isolates collected by baiting with toothpicks are being genotyped using eight microsatellite markers. Furthermore, in order to understand how diversity is generated in AG2-2, we need to identify the extent to which recombination occurs. Since AG2-2 rarely produces a sexual stage, genetic material is expected to be exchanged through hyphal fusion. However, anastomosis reactions typically result in death of the cells adjacent to the fusion site. It is therefore unclear how much genetic exchange occurs between isolates. Preliminary evidence from microsatellite loci sequencing shows that isolates from different genetic groups have microsatellite alleles that are identical by sequence, which is suggestive of an exchange of genetic material. To test the extent of asexual hybridization, isolates from different genetic groups were paired on water agar and potential hybrids isolated. Several resultant isolates showed variation in cultural characteristics from the parent cultures indicating possible hybridization occurring. The microsatellite analysis is ongoing.