Articles containing the keyword 'isolation'

Fungal diaspores were caught in Southern Finland (Helsinki, Turku, Jyväskylä, Lappeenranta) and in Northern Finland (Oulu, Ivalo) in 1967—68 on exposed discs of Picea abies (L.) Karst. wood. In the laboratory, the diaspores on the discs developed mycelia which stained the wood. A month after exposure fungi and bacteria were isolated from stained areas.

The number of identified fungal species was relatively high and included fungi of different taxonomic groups. The most common fungi identified were Peniophora gigantea and Trichoderma viride. The most common Agaricaceae obtained were species of Hypholoma. Of the fungi imperfecti, relatively high numbers of not only Trichoderma viride but also of the Alternaria and Fusarium species were isolated. According to the investigation, species of several fungal groups seem to participate in the early stages of the decayed process of spruce.

The PDF includes a summary in Finnish.

• Kallio, E-mail: tk@mm.unknown

The effects of long-term habitat fragmentations on genetic and population differentiation of Betula pendula Roth were investigated using chloroplast DNA (cpDNA) variations. Leaf samples were collected from four small remnant populations across the north of Iran. Three pairs of universal primers were used to amplify cpDNA, large single copy regions of trnC-trnD, trnK1-trnK2 and trnD-trnT. A total of 18 of the cpDNA haplotypes in the four populations were identified, however, no clear phylogeographic structuring of haplotypes could be detected. The total genetic diversity (H_T) for all populations was high (0.932). Average intra-population genetic diversity was estimated as H_S = 0.729 and average differentiation of populations G_ST = 0.218. Mantel tests of isolation by distance revealed a significant relationship between Wright’s inbreeding coefficient (Fst) and geographical distances for the four populations in Iran (r = 0.77, p < 0.05). The results of the hierarchical analysis of molecular variance (AMOVA) indicated that a 66% variation was partitioned within populations, whilst the variance amongst the four populations was only 34%. We suggest that significant genetic differentiation amongst populations can likely be attributed to reduced gene flow as a result of habitat fragmentation.

• Yousefzadeh, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Nour, Mazandaran, Iran E-mail: h.yousefzadeh@modares.ac.ir
• Hosseinzadeh Colagar, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran E-mail: ahcolagar@umz.ac.ir
• Fallah, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran E-mail: fatemehfalah69@yahoo.com

• Jadwiszczak, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland E-mail: kszalaj@uwb.edu.pl
• Drzymulska, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland E-mail: dd@nn.pl
• Banaszek, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland E-mail: ab@nn.pl
• Jadwiszczak, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland E-mail: pj@nn.pl