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Titolo:
Genetic variability of Canadian populations of the sapstain fungus Ophiostoma piceae.
Autore:
Gagne, P; Yang, DQ; Hamelin, RC; Bernier, L;
Indirizzi:
Univ Laval, Ctr Rech Biol Foresteriere, Quebec City, PQ G1K 7P4, Canada Univ Laval Quebec City PQ Canada G1K 7P4 Quebec City, PQ G1K 7P4, Canada Forintek Canada Corp, Eastern Lab, St Foy, PQ G1P 4R4, Canada Forintek Canada Corp St Foy PQ Canada G1P 4R4 St Foy, PQ G1P 4R4, Canada Canadian Forestry Serv, Laurentian Forestry Ctr, St Foy, PQ G1V 4C7, Canada Canadian Forestry Serv St Foy PQ Canada G1V 4C7 t Foy, PQ G1V 4C7, Canada
Titolo Testata:
PHYTOPATHOLOGY
fascicolo: 4, volume: 91, anno: 2001,
pagine: 369 - 376
SICI:
0031-949X(200104)91:4<369:GVOCPO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLUE-STAIN FUNGI; NORTH-AMERICA; BIOLOGICAL-CONTROL; CRONARTIUM-RIBICOLA; ARBITRARY PRIMERS; NOVO-ULMI; DIVERSITY; WOOD; PINE; PILIFERUM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Bernier, L Univ Laval, Ctr Rech Biol Foresteriere, Quebec City, PQ G1K 7P4, Canada Univ Laval Quebec City PQ Canada G1K 7P4 y, PQ G1K 7P4, Canada
Citazione:
P. Gagne et al., "Genetic variability of Canadian populations of the sapstain fungus Ophiostoma piceae.", PHYTOPATHOL, 91(4), 2001, pp. 369-376

Abstract

Genetic diversity was studied in seven Canadian populations of Ophiostoma piceae, the most prevalent sapstain fungus in Canadian softwoods. A total of 239 single-spore isolates were recovered following a systematic survey ofsapstain fungi in logs and lumber at seven selected sawmills in six Canadian provinces (British Columbia, Alberta, Saskatchewan, Ontario, Quebec, andNew Brunswick). Sampling was carried out on five commercially important softwood species: balsam fit (Abies balsamea), white spruce (Picea glauca), black spruce (Picea mariana), jack pine (Pinus banksiana), and lodgepole pine (Pinus contorta var. latifolia). The A and B mating types occurred at equal frequency (MAT A/MAT B = 1.00:1.13) over all populations. Pseudoallelic frequencies were estimated at each of 24 putative genetic loci by fragmentsgenerated by five primers. A total of 237 haplotypes were found among the 239 isolates, revealing a high level of genotypic diversity among isolates. Total gene diversity (H-T = 0.414) was mostly attributable to diversity within populations (H-S = 0.369). Thus, only 11.2% of the total variability was attributable to frequency differences among populations. An analysis of molecular variance revealed that most genetic variability occurred within subpopulations within mills (84.3%; P < 0.001), whereas low but statistically significant levels of genetic differentiation were also observed among subpopulations within populations (5.4%; P < 0.001) and among populations (10.3%; P < 0.001). Estimates of Nei's genetic distances were not correlated with geographic distances among sampling locations (r = -0.092; P = 0.310), although principal component analysis indicated that subpopulations locatedeast of Saskatchewan were grouped on the same side of the second principalcomponent axis. Overall, results suggest moderate genetic differentiation of O. piceae in Canada, which is consistent with the observation that sexual reproduction is frequently observed in this fungus.

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Documento generato il 28/11/20 alle ore 09:50:59