Molecular characterization of Inonotus rickii /Ptychogaster cubensis isolates from different geographic provenances |
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Authors: | Daniele De Simone Lorella D’Amico Daniela Bressanin Emma Motta and Tiziana Annesi |
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Institution: | (1) C.R.A. - Centro di Ricerca per la Patologia Vegetale, Via C.G. Bertero 22, Roma, 00156, Italy; |
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Abstract: | Thirteen isolates of Inonotus rickii/Ptychogaster cubensis, from different geographic provenances, were analyzed by sequencing ITS1, ITS 2 and 5,8S ribosomal RNA region. A phylogenetic
tree, also including sequences available in Genbank database, showed that the strains enclosed in this study fall into two
well-separated groups, one formed by isolates from Florida (USA) and the other one by isolates from Europe, Argentina and
China. Differences were also highlighted on the growth rate of mycelial cultures at different temperatures. In fact, although
the tested isolates generally attained the best growth at 30°C, isolates from Europe seem well adapted to higher temperatures
and went on growing at 40°C whilst the growth of isolates from Florida significantly decreased at 35°C. Since the teleomorph
I. rickii was never detected in Florida, and in this study noticeable differences were detected by analysis of ITS region, the existence
of two possible distinct species, not discriminated solely on the basis of morphological characters, could be suggested. |
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