Taxonomy and phylogenetic position of Phyllactinia takamatsui, a newly described powdery mildew on cotoneaster, based on molecular and morphological data
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The newly recognised powdery mildew species Phyllactinia takamatsui on Cotoneaster nummularius (Rosaceae) is described and illustrated. This species, collected in Kerman Province, Iran, is well characterised by its conidial morphology and rDNA ITS sequences clearly different from allied species. Conidia are broadly ellipsoid to subcylindrical, i.e. they are not clavate-spathuliform as in most Phyllactinia species. The rDNA ITS sequence analysis showed that this species is closely allied to other species described on hosts belonging to Rosaceae, such as Ph. mali and Ph. pyri-serotinae. The ITS sequence of P. takamatsui was 92 to 94 % similar to that of the closest known relatives. The new species is described in detail, illustrated and compared with other similar taxa.
KeywordsBiodiversity Erysiphales Phyllactinia mali rDNA Rosaceae
The authors would like to thank the two anonymous referees for their valuable comments that greatly improved the final version of the paper. This work was supported in part by a grant from the Deputy of Research and Technology of the University of Guilan, Iran.
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