Journal
MYCOLOGIA
Volume 113, Issue 4, Pages 715-724Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00275514.2021.1909449
Keywords
Afforestation; microsatellites; Pinus contorta; Pinus ponderosa; Pinus radiata; Pinus sylvestris; slippery jack
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Funding
- Ministerio de Ciencia, Tecnologia e Innovacion (MINCyT) [PICT-2015/1723, PFIP NEU008/2009]
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The research shows that S. luteus was introduced into Patagonia relatively recently, resulting in weak genetic structure and high gene flow possibly due to a founder effect from a small number of genets introduced. There is moderate genetic diversity within different sites, but low differentiation between sites.
Suillus luteus is a common ectomycorrhizal (EM) fungus associated with several Pinus species. It is distributed throughout the Northern Hemisphere and has been introduced into South America and New Zealand. We examined the genetic structure and population biology of S. luteus, which was introduced into Patagonian plantations with Pinus species in Argentina. Overall, 106 samples were collected at 11 geographically separated sites (i.e., Pinus plantations) along a latitudinal gradient in Patagonia (ca. 38 degrees-46 degrees south latitude). Phylogenetic analyses confirmed placement in S. luteus. Genetic analysis demonstrated moderate within-site genetic diversity, but low differentiation between sites. No clear clusters were detected geographically or in relation to host species of Pinus. Our results suggest that the weak genetic structure of the species reflects the short time that has elapsed since the introduction of S. luteus into Patagonia, and its expansion with exotic afforestation there. Moreover, the lack of structure is consistent with a founder effect, suggesting the introduction of a small number of genets that spread throughout all the plantations. Therefore, the high level of gene flow and weak genetic structure observed are probably related to the anthropogenic movement of inoculum associated with forestry practices.
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