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Titolo:
ANALYSIS OF GENETIC-STRUCTURE IN SOIL POPULATIONS OF RHIZOBIUM-LEGUMINOSARUM RECOVERED FROM THE USA AND THE UK
Autore:
STRAIN SR; WHITTAM TS; BOTTOMLEY PJ;
Indirizzi:
OREGON STATE UNIV,DEPT MICROBIOL,NASH HALL RM 220 CORVALLIS OR 97331 OREGON STATE UNIV,DEPT MICROBIOL CORVALLIS OR 97331 OREGON STATE UNIV,DEPT CROP & SOIL SCI CORVALLIS OR 97331 PENN STATE UNIV,DEPT BIOL UNIVERSITY PK PA 16802
Titolo Testata:
Molecular ecology
fascicolo: 1, volume: 4, anno: 1995,
pagine: 105 - 114
SICI:
0962-1083(1995)4:1<105:AOGISP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ESCHERICHIA-COLI; NATURAL-POPULATIONS; NEISSERIA-MENINGITIDIS; LINKAGE DISEQUILIBRIUM; ENZYME POLYMORPHISM; EASTERN WASHINGTON; BV TRIFOLII; DIVERSITY; BACTERIUM; PALOUSE;
Keywords:
GENETIC STRUCTURE; LINKAGE DISEQUILIBRIUM; POPULATION ECOLOGY OF PROKARYOTES; RHIZOBIUM LEGUMINOSARUM; SOIL MICROBIOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
S.R. Strain et al., "ANALYSIS OF GENETIC-STRUCTURE IN SOIL POPULATIONS OF RHIZOBIUM-LEGUMINOSARUM RECOVERED FROM THE USA AND THE UK", Molecular ecology, 4(1), 1995, pp. 105-114

Abstract

Although many studies have shown that animal-associated bacterial species exhibit linkage disequilibrium at chromosomal loci, recent studies indicate that both animal-associated and soil-borne bacterial species can display a nonclonal genetic structure in which alleles at chromosomal loci are in linkage equilibrium. To examine the situation in soil-borne species further, we compared genetic structure in two soil populations of Rhizobium leguminosarum bv. trifolii and two populations of R. leguminosarum bv. viciae from two sites in Oregon, with genetic structure in R. leguminosarum bv. viciae populations recovered from peas grown at a site in Washington, USA, and at a site in Norfolk, UK. A total of 234 chromosomal types (ET) were identified among 682 strains analysed for allelic variation at 13 enzyme-encoding chromosomal loci by multilocus enzyme electrophoresis (MLEE). Chi-square tests for heterogeneity of allele frequencies showed that the populations were not genetically uniform. A comparison of the genetic diversity within combined and individual populations confirmed that the Washington population was the primary cause of genetic differentiation between the populations. Each individual population exhibited linkage disequilibrium, with the magnitude of the disequilibrium being greatest in the Washingtonpopulation and least in the UK population of R. leguminosarum bv. viciae. Linkage disequilibrium in the UK population was created between two clusters of 9 and 23 ETs, which, individually, were in linkage equilibrium. Strong linkage disequilibrium between the two major clusters of 8 and 12 ETs in the Washington population was caused by the low genetic diversity of the ETs within each cluster relative to the inter-cluster genetic distance. Because neither the magnitude of genetic diversity nor of linkage disequilibrium increased as hierarchical combinations of the six local populations were analysed, we conclude that the populations have not been isolated from each other for sufficient time,nor have they been exposed to enough selective pressure to develop unique multilocus genetic structure.

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Documento generato il 23/09/20 alle ore 09:12:07