AI Article Synopsis
- Pisolithus microcarpus is an ectomycorrhizal fungus that forms relationships with various plant roots and has a broad presence in plantation forests globally, particularly in southeastern Australia.
- This study examined the genetic population structure of P. microcarpus using five genetic markers and found limited differentiation among geographical populations, indicating significant gene flow.
- Most genetic variation occurred within populations rather than between them, with only 1.3% of variation found among geographic areas, suggesting that wind or spore dispersal maintains genetic homogeneity in closely located populations in New South Wales.
Article Abstract
Pisolithus are ectomycorrhizal fungi that associate with roots of numerous plant species in natural and plantation forests worldwide. Despite the fact that Pisolithus spp. are present in plantation forests in many countries, knowledge of the genetic population structure of Pisolithus spp. remains limited. In this study, we have tested the hypothesis that a propensity for long-distance spore dispersal in Pisolithus microcarpus, along with the widespread distribution of potential eucalypt and acacia plant hosts in south-eastern Australia facilitates gene flow that limits population differentiation. Five polymorphic simple sequence repeat markers were used to investigate the population structure of P. microcarpus. Isolates were grouped according to geographical origin and isolate genotypes were analysed among the geographical populations. Pairwise F (ST) estimates indicated limited genetic differentiation among the geographical populations. Analysis of molecular variance revealed that most of the genetic variation present was within geographical populations, with only 1.3% of the genetic variation among P. microcarpus geographical populations. This was particularly pronounced for four geographical populations within a ca 7,000 km(2) area New South Wales, which were each separated by < 100 km and appeared to be genetically homogeneous. The lack of population structure is suggested to be due to a high degree of gene flow, via basidiospores, between the New South Wales geographical populations.
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| http://dx.doi.org/10.1007/s00572-010-0317-3 | DOI Listing |
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