Dominance of a Rhizopogon sister species corresponds to forest age structure

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• 作者：Carrie H. Van Dorp ; Kevin J. Beiler ; Daniel M. Durall
• 关键词：Mycorrhizas ; Genotypes ; Forest age structure ; Fungal genotypes ; Cryptic species
• 刊名：Mycorrhiza
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：26
• 期：2
• 页码：169-175
• 全文大小：408 KB
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• 作者单位：Carrie H. Van Dorp (1)
  Kevin J. Beiler (2)
  Daniel M. Durall (1)
  
  1. Unit 2 Biology Department, Irving K. Barber School of Arts and Sciences, University of British Columbia, Okanagan campus 1177 Research Road, Science Building, Kelowna, BC, V1V 1V7, Canada
  2. Life Sciences and Technology Department, Beuth University of Applied Sciences Berlin, 13353, Berlin, Germany
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Microbiology
  Plant Sciences
  Ecology
  Agriculture
  Forestry
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1890

文摘

Rhizopogon vesiculosus and Rhizopogon vinicolor are sister species of ectomycorrhizal fungi that associate exclusively with Douglas-fir (DF). They form tuberculate mycorrhizas and they can be easily distinguished using molecular tools. We are not aware of studies relating their relative abundance in forests with different age classes. Our objective was to determine whether a change in the number or relative abundance of R. vesiculosus and R. vinicolor tubercules and genotypes was related to a change in the percent of DF in a regenerating phase (<50 years old). R. vesiculosus and R. vinicolor were located by excavating tuberculate mycorrhizas from the forest floor. A DNA Alu1 digest was used to distinguish between the two species. Microsatellite markers were used to identify genotypes. The number of R. vesiculosus tubercules correlated positively with an increasing proportion of DF in a regenerating phase, while the number of R. vinicolor tubercules was similar across all forest age structures. The number of R. vesiculosus genotypes did not correlate with forest age structure, whereas the number of R. vinicolor genotypes showed a negative relationship with an increasing proportion of DF in a regenerating phase. When the numbers of R. vesiculosus tubercules and genotypes were expressed as a relative abundance of the two species, there was a positive correlation with an increasing proportion of DF in a regenerating phase for both genotypes and tubercules. Our results suggest that the degree of DF regeneration or ecosystem factors related to DF regeneration affect the population dynamics of R. vesiculosus and R. vinicolor differently. Keywords Mycorrhizas Genotypes Forest age structure Fungal genotypes Cryptic species