Risto Jalkanen, Juha Kaitera. (1994). Gremmeniella abietina produces pycnidia in cankers of living shoots with green needles on Scots pine. Silva Fennica vol. 28 no. 2 article id 5402. https://doi.org/10.14214/sf.a9168

Keywords: Pinus sylvestris; Gremmeniella abietina; disease resistance; lifecycle; pycnidia

Abstract | View details | Full text in PDF | Author Info

A Gremmeniella abietina (Lagerb.) race of type A was found to produce pycnidia in cankers of previous year’s shoots (1991) on branches of Scots pine (Pinus sylvestris L.) bearing green needles and living buds in the current-year shoots (1992) with no apparent symptoms of infection by G. abietina. The restricted colonization of green shoots by G. abietina, with only restricted canker development, may indicate that older, slow-growing natural Scots pines of the northern boreal forests resists the fungus well. However, the ability of the fungus to survive and even sporulate in such cankers indicates one way of surviving over consecutive years otherwise unfavourable for it.

Jalkanen, E-mail: rj@mm.unknown
Kaitera, E-mail: jk@mm.unknown

Category : Research article

article id 104, category Research article

Eeva Terhonen, Teresa Marco, Hui Sun, Risto Jalkanen, Risto Kasanen, Martti Vuorinen, Fred Asiegbu. (2011). The effect of latitude, season and needle-age on the mycota of Scots pine (Pinus sylvestris) in Finland. Silva Fennica vol. 45 no. 3 article id 104. https://doi.org/10.14214/sf.104

Keywords: Pinus sylvestris; needles; harsh environment; mycota; needle age; cryptic lifecycle; Hormonema dematioides

Abstract | View details | Full text in PDF | Author Info

The seasonal and latitudinal influences on the diversity and abundance of mycota of Pinus sylvestris needles were investigated. A sample of 1620 needles resulted in a total of 3868 fungal isolates, which were assigned to 68 operational taxonomic units (OTUs). The majority of these OTUs (65%) belong to Ascomycota and only 0.03% was grouped as Basidiomycota. The dominant and most frequently isolated OTU was Hormonema dematioides. Other well-known species with a saprotrophic nutritional mode such as Lophodermium spp. were also observed. The abundance of fungi increased from fall to spring. Frequencies varied significantly in Northern and Southern Finland suggesting that factors associated with latitudinal differences have an impact on the abundance of fungi.

Terhonen, University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: et@nn.fi
Marco, University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: tm@nn.fi
Sun, University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: hs@nn.fi
Jalkanen, Finnish Forest Research Institute, Rovaniemi Research Unit, Rovaniemi, Finland E-mail: rj@nn.fi
Kasanen, University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: rk@nn.fi
Vuorinen, Finnish Forest Research Institute, Suonenjoki Research Unit, Suonenjoki, Finland E-mail: mv@nn.fi
Asiegbu, University of Helsinki, Department of Forest Sciences, P.O. Box 27, FI-00014 University of Helsinki, Finland E-mail: fa@nn.fi

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