Plant Pathology (1997) 46, 773-784

N. La Porta, P. Capretti, K. Kammiovirta, R. Karjalainen and K. Korhonen (1997)
Geographical cline of DNA variation within the F intersterility group of Heterobasidion annosum in Italy
Plant Pathology 46 (5), 773-784
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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Database assignments for author(s): Nicola La Porta, Kari Korhonen, Paolo Capretti

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Heterobasidion annosum		Italy