Saitozyma
Saitozyma X.Z. Liu, F.Y. Bai, M. Groenew. & Boekhout, in Liu et al., Studies in Mycology 81: 113 (2015)
Etymology: The genus is named in honour of the Japanese yeast taxonomist Masuyoshi Saito.
Diagnosis: Basidiocarps not known. Cultures can be pigmented and pale to brownish-yellow in colour. Pseudohyphae and true hyphae may be present. Sexual reproduction not observed in culture. Budding cells present. Ballistoconidia occasionally present. Fermentation absent. Nitrate not utilised. Starch-like compounds weakly produced or not formed. Major CoQ system CoQ-10.
Index Fungorum number: IF813367
Type species: Saitozyma flava (Saito) Xin Zhan Liu, F.Y. Bai, M. Groenew. & Boekhout, in Liu et al., Studies in Mycology 81: 113 (2015)
Notes: The flavus clade delimited in Liu et al. (2015a) based on multiple genes is equivalent to the podzolicus clade in Boekhout et al. (2011), which was based on the analysis of LSU rRNA gene (D1/D2 domains) sequences, even though this clade received no bootstrap support. In the tree from the expanded LSU rRNA gene dataset, the close relationship between C. podzolicus and Bullera ninhbinhensis was confirmed, but they did not form a monophyletic clade with the other two species, C. flavus and C. paraflavus, in the flavus clade (Figure 1). Since the affinity of C. podzolicus with the flavus clade was strongly supported in the trees obtained both from the seven genes and the three rRNA gene datasets (Liu et al. 2015a), Liu et al. (2015b) assign these species to Saitozyma.
Figure 1. Phylogenetic relationships of yeasts and related taxa from the order Tremellales in Tremellomycetes obtained by maximum-likelihood analysis of LSU (D1/D2 domains) rRNA gene. Tree topology was backbone-constrained with the well-supported (>85 %) bipartitions of the topology of the seven-genes tree (Liu et al. 2015a). Bootstrap percentages (BP) of maximum likelihood and neighbour-joining analyses from 1 000 replicates are shown respectively from left to right on the deep and major branches resolved and in brackets following recognised clades. The type species of accepted genera are in bold and the taxa not included in the seven-genes dataset (Liu et al. 2015a) are in red. Note: ns, not supported (BP < 50 %).
References:
Boekhout, T., Fonseca, A., Sampaio, J. P., Bandoni, R. J., Fell, J. W., & Kwon-Chung, K. J. (2011). Discussion of teleomorphic and anamorphic basidiomycetous yeasts. In The Yeasts, 1339-1372. Elsevier.
Liu, X. Z., Wang, Q. M., Theelen, B., Groenewald, M., Bai, F. Y., & Boekhout, T. (2015a). Phylogeny of tremellomycetous yeasts and related dimorphic and filamentous basidiomycetes reconstructed from multiple gene sequence analyses. Studies in mycology, 81, 1-26
Liu X.Z, Wang Q.M, Göker M, Groenewald M, Kachalkin A.V, Lumbsch H.T, Millanes A.M, Wedin M, Yurkov A.M, Boekhout T, Bai F.Y. (2015b). Towards an integrated phylogenetic classification of the Tremellomycetes. Studies in Mycology. 81:85-147
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