Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy |
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| Authors: | N LA PORTA P CAPRETTI K KAMMIOVIRTA R KARJALAINEN & K KORHONEN |
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| Institution: | Universitàdi Firenze, Istituto di Patologia e Zoologia Forestale e Agraria, P. delle Cascine 28, I-50144 Firenze, Italy,;University of Helsinki, Department of Plant Biology, Plant and Forest Pathology Section, PO Box 28, 00014 Helsinki,;Finnish Forest Research Institute, Vantaa Research Centre, PO Box18, 01301 Vantaa;Finland |
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| Abstract: | Eighty-six Heterobasidion annosum isolates, mainly belonging to the F intersterility group and obtained from 32 different geographical localities in Italy, were subjected to genetic analysis by the Random Amplified Polymorphic DNA (RAPD) markers. The similarity between F and S groups was higher than that between F and P. In UPGMA Cluster Analysis, the F isolates originating from the same locality usually grouped in the same cluster. The isolates also showed a tendency to group at the level of larger geographical areas. Within the F group, isolates from the south of the Italian peninsula showed the highest genetic variation and northern isolates from the Alpine regions showed the lowest. This indicates a gradual cline along the peninsula. The genetic variability in the Italian F group is discussed in relation to the past and present distribution of the host species in Italy and Europe. |
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