Understanding introduction history: Genetic structure and diversity of the edible ectomycorrhizal fungus, Suillus luteus, in Patagonia (Argentina).

AZPILICUETA M M; PILDAIN MB; STARIK C; MARCHELLI P; BARROETAVEÑA C

MYCOLOGIA.

ALLEN PRESS INC

Año: 2021 p. 1 - 10

0027-5514

Suillus luteus is a common ectomycorrhizal (EM) fungus associated with several Pinus species. It isdistributed throughout the Northern Hemisphere and has been introduced into South America andNew Zealand. We examined the genetic structure and population biology of S. luteus, which wasintroduced into Patagonian plantations with Pinus species in Argentina. Overall, 106 samples werecollected at 11 geographically separated sites (i.e., Pinus plantations) along a latitudinal gradient inPatagonia (ca. 38°?46° 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.