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Titolo:
Genetic structure of Cronartium ribicola populations in eastern Canada
Autore:
Et-touil, K; Bernier, L; Beaulieu, J; Berube, JA; Hopkin, A; Hamelin, RC;
Indirizzi:
Canadian Forestry Serv, Laurentian Forestry Ctr, Nat Resources Canada, St Foy, PQ G1V 4C7, Canada Canadian Forestry Serv St Foy PQ Canada G1V 4C7 t Foy, PQ G1V 4C7, Canada Univ Laval, Ctr Rech Biol Forestiere, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 orestiere, St Foy, PQ G1K 7P4, Canada Canadian Forestry Serv, Great Lakes Forestry Ctr, Nat Resources Canada, Sault St Marie, ON, Canada Canadian Forestry Serv Sault St Marie ON Canada ult St Marie, ON, Canada
Titolo Testata:
PHYTOPATHOLOGY
fascicolo: 10, volume: 89, anno: 1999,
pagine: 915 - 919
SICI:
0031-949X(199910)89:10<915:GSOCRP>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN UNITED-STATES; PINE BLISTER RUST; PERIDERMIUM-HARKNESSII; DIVERSITY; DISTANCE; MARKERS; RACE;
Keywords:
Mantel tests;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Hamelin, RC Canadian Forestry Serv, Laurentian Forestry Ctr, Nat ResourcesCanada, 1055 PEPS, St Foy, PQ G1V 4C7, Canada Canadian Forestry Serv 1055 PEPS St Foy PQ Canada G1V 4C7 nada
Citazione:
K. Et-touil et al., "Genetic structure of Cronartium ribicola populations in eastern Canada", PHYTOPATHOL, 89(10), 1999, pp. 915-919

Abstract

The genetic structure of populations of Cronartium ribicola was studied bysampling nine populations from five provinces in eastern Canada and generating DNA profiles using nine random amplified polymorphic DNA markers. Mostof the total gene diversity (H-t = 0.386) was present within populations (H-w = 0.370), resulting in a low level of genetic differentiation among populations in northeastern North America (F-st = 0.062). A hierarchical analysis of genetic structure using an analysis of molecular variance (AMOVA) revealed no statistically significant genetic differentiation among provincesor among regions. Yet, genetic differentiation among populations within regions or provinces was small (AMOVA phi(st) = 0.078) but statistically significant (P < 0.001) and was several orders of magnitude larger than differentiation among provinces. This is consistent with a scenario of subpopulations within a metapopulation, in which random drift following migration and new colonization are major evolutionary forces. A phenetic analysis using genetic distances revealed no apparent correlation between genetic distance and the province of origin of the populations. The hypothesis of isolation-by-distance in the eastern populations of C. ribicola was rejected by computing Mantel correlation coefficients between genetic and geographic distance matrices (P > 0.05). These results show that eastern Canadian provinces are part of the same white pine blister rust epidemiological unit. Nursery distribution systems are controlled provincially, with virtually no seedlingmovement among provinces; therefore, infected nursery material may not play an important role in the dissemination of this disease. Long-distance spore dispersal across provincial boundaries appears to be an epidemiologically important factor for this pathogen.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:37:42