Abstract Detail

Mycological Section

Zhang, Rui [1], Shi, Xiaofei [2], Liu, Pei-gui [2], Gregory, Mueller [1].

Twelve New Species of Suillus from China and a Multigene Phylogeny of the genus based on representatives from North America, Eastern Asia and Europe.

Suillus is an important ectomycorrhizal fungal genus that has high host specificity with Pinaceae. Despite its ecological importance and model position in studying ectomycorrhizal fungal evolution, the systematics of Suillus at the global level remains understudied. Of the legitimately described 102 species of Suillus, 88 are from North America and Europe, with the remainder comprised of scattered reports from other regions. For example, only 6 species of Suillus have been described from China, and none of those are represented by molecular sequences in public databases. North American and European Suillus names are still used in naming both herbarium specimens and molecular sequences collected from Eastern Asia. To investigate Suillus diversity in China, we examined 850 new collections and herbarium specimens covering most geographic areas of China. Of these specimens, 172 were selected for molecular analysis. We also generated reference sequences for ITS, 28S, TEF1, RPB1, RPB2 and atp6 from 44 species form North America and Europe. We found only a few new Chinese species that are distinct in both morphology and sequence from described ones. Most of the new species are morphological similar and phylogenetic close to their North American and European sister species. In comparison of single gene to multigene phylogenies of Suillus, we revealed that TEF1 provides better barcoding services in supporting monophyletic species clades and interspecies relationships than ITS; and this was especially useful in separating geographic species complexes like S. luteus and S. americanus-S. sibiricus. Additionally, topological variations exist among Suillus phylogenies built from different genes, concatenated gene alignments, and coalescent estimation. Systematic studies of Suillus are important in estimating global diversity, providing barcoding services for environmental samples, evaluating host specificity, and revealing evolutionary history of ectomycorrhizal fungi. Sampling efforts in understudied areas are strongly encouraged. Besides ITS, TEF1 is recommended to barcode Suillus species.

1 - Chicago Botanic Garden, Department Of Botany, 1000 Lake Cook Road, Glencoe, IL, 60022, USA
2 - Kunming Institute of Botany, Chinese Academy of Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650204, China

Keywords:
new species
Fungal barcoding
multigene phylogeny.

Presentation Type: Oral Paper:Papers for Sections
Session: 56
Location: Salon 1/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 8:45 AM
Number: 56004
Abstract ID:843
Candidate for Awards:None