Population genetic structure of <Emphasis Type="Italic">Sclerotinia sclerotiorum</Emphasis> on canola in Iran |
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| Authors: | Roghayeh Hemmati Mohammad Javan-Nikkhah Celeste C Linde |
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| Institution: | (1) Department of Plant Protection, University College of Agriculture and Natural Resources, University of Tehran, Karaj, 31587-77871, Iran;(2) Botany and Zoology, Research School of Biology, College of Medicine, Biology and Environment, Daley Rd, Australian National University, Canberra, ACT, 0200, Australia; |
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| Abstract: | The genetic structure of 276 Sclerotinia sclerotiorum isolates representing 37 field populations from four provinces in northern Iran were analysed with six polymorphic microsatellite
loci. In total, 80 haplotypes were detected with 19 haplotypes (23.7%) shared amongst at least two regional populations. None
of the haplotypes were shared among all four regional populations. Of the 80 haplotypes, 32 haplotypes (40%) occurred in low
frequencies represented by only one isolate. Moderate levels of gene diversity (H = 0.51 to 0.61) and genotypic diversity (Ĝ = 12.0 to 22.0; clonal fraction = 0.39 to 0.67) for regional populations were observed. Genotypic diversities (Ĝ) did not differ significantly among populations. All regional populations were in linkage equilibrium indicating the occurrence
of outcrossing. Low to moderate levels of population subdivision (0.03 to 0.07), were observed among regional populations.
Only one large panmictic population was inferred by Structure, indicating no significant population structure. A Mantel test showed no significant isolation by distance (r = −0.43; P = 0.18), indicating anthropogenic movement of inoculum. The results demonstrated that S. sclerotiorum populations in northern Iran, are randomly mating and have a number of shared haplotypes among regional populations; this
possibly represents recent founder populations and/or a high occurrence of anthropogenic migration of infected plant material
among populations. |
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