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Endophytic foliar fungi in Betula spp. and their F1 hybrids

2003; Wiley; Volume: 33; Issue: 4 Linguagem: Inglês

10.1046/j.1439-0329.2003.00325.x

1439-0329

Kari Saikkonen, Marjo Helander, Matti Rousi,

Yeasts and Rust Fungi Studies

Summary We examined foliar endophyte frequencies in two native ( Betula pendula and Betula pubescens ) and three exotic ( Betula ermanii, Betula platyphylla and Betula resinifera ) birch species and their hybrids in Punkaharju, Finland. The most frequently isolated endophytic fungi in the experimental trees were Fusicladium betulae and Gnomonia setacea making up 80–90% of all endophyte infections. Total endophyte infection levels varied from 0.5 colony forming units (CFU)/cm 2 in B. platyphylla to 8.6 CFU/cm 2 in B. pubescens that had highest total infection levels of both examined endophyte species. The resistance of hybrids was generally very close to the more resistant parent (the only exception being Fusicladium in B. platyphylla × B. pendula hybrid) supporting the hypothesis that the resistance of birch hybrids to these fungi is genetically based and caused by dominant inheritance of resistance traits.