Amplified fragment length polymorphism (AFLP) was tested as an alternative to the DNA–DNA hybridization technique (DDH) to delineate genomospecies and the phylogenetic structure within the genus
Frankia. FortyFrankiastrains, including representatives of seven DDH genomospecies, were typed in order
to infer current genome mispairing (CGM) and evolutionary genomic distance (EGD). The constructed
phylogeny revealed the presence of three main clusters corresponding to the previously identified hostinfecting groups. In all instances, strains previously assigned to the same genomospecies were grouped
in coherent clusters. A highly significant correlation was found between DDH values and CGM computed
from AFLP data. The species definition threshold was found to range from 0.071 to 0.098 mismatches
per site, according to host-infecting groups, presumably as a result of large genome size differences.
Genomic distances allowed newFrankiastrains to be assigned to nine genomospecies previously determined by DDH. The applicability of AFLP for the characterization of uncultured endophytic strains was
tested on experimentally inoculated plants and then applied toAlnus incanaandA. viridisfield nodules
hosting culture refractory spore-positive (Sp+, that sporulatein planta) strains. Only 1.3% of all AFLP fragments were shown to be generated by the contaminant plant DNA and did not interfere with accurate
genomospecies identification of strains. When applied to field nodules, the procedure revealed thatAlnus
Sp+ strains werebona fidemembers of theAlnus-Myricahost infecting group. They displayed significant
genomic divergence from genomospecies G1 ofAlnusinfecting strains (i.e. Frankia alni) and thus may
belong to another subspecies or genomospecies
Amplified fragment length polymorphism (AFLP) was tested as an alternative to the DNA–DNA hybridization technique (DDH) to delineate genomospecies and the phylogenetic structure within the genusFrankia. FortyFrankiastrains, including representatives of seven DDH genomospecies, were typed in orderto infer current genome mispairing (CGM) and evolutionary genomic distance (EGD). The constructedphylogeny revealed the presence of three main clusters corresponding to the previously identified hostinfecting groups. In all instances, strains previously assigned to the same genomospecies were groupedin coherent clusters. A highly significant correlation was found between DDH values and CGM computedfrom AFLP data. The species definition threshold was found to range from 0.071 to 0.098 mismatchesper site, according to host-infecting groups, presumably as a result of large genome size differences.Genomic distances allowed newFrankiastrains to be assigned to nine genomospecies previously determined by DDH. The applicability of AFLP for the characterization of uncultured endophytic strains wastested on experimentally inoculated plants and then applied toAlnus incanaandA. viridisfield noduleshosting culture refractory spore-positive (Sp+, that sporulatein planta) strains. Only 1.3% of all AFLP fragments were shown to be generated by the contaminant plant DNA and did not interfere with accurategenomospecies identification of strains. When applied to field nodules, the procedure revealed thatAlnusSp+ strains werebona fidemembers of theAlnus-Myricahost infecting group. They displayed significantgenomic divergence from genomospecies G1 ofAlnusinfecting strains (i.e. Frankia alni) and thus maybelong to another subspecies or genomospecies
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ความแตกต่างความยาวส่วนขยาย Amplified fragment length polymorphism (AFLP) was tested as an alternative to the DNA- –เทคนิคการผสมข้ามพันธุ์ดีเอ็นเอ DNA hybridization technique (DDH) to delineate genomospecies and the phylogenetic structure within the genus
Frankia FortyFrankiastrains Frankia. FortyFrankiastrains, including representatives of seven DDH genomospecies, were typed in order
ถูกพิมพ์ในการสั่งซื้อเพื่อสรุปจีโนมในปัจจุบันmispairing (CGM) to infer current genome mispairing (CGM) and evolutionary genomic distance (EGD). The constructed
phylogeny revealed the presence of three main clusters corresponding to the previously identified hostinfecting groups. In all instances, strains previously assigned to the same genomospecies were grouped
in coherent clusters. A highly significant correlation was found between DDH values and CGM computed
from AFLP data. The species definition threshold was found to range from 0.071 to 0.098 mismatches
per site, according to host-infecting groups, presumably as a result of large genome size differences.
Genomic distances allowed newFrankiastrains to be assigned to nine genomospecies previously determined by DDH. The applicability of AFLP for the characterization of uncultured endophytic strains was
tested on experimentally inoculated plants and then applied toAlnus incanaandA. viridisfield nodules
hosting culture refractory spore-positive (Sp+, that sporulatein planta) strains. Only 1.3% of all AFLP fragments were shown to be generated by the contaminant plant DNA and did not interfere with accurate
genomospecies identification of strains. When applied to field nodules, the procedure revealed thatAlnus
Sp+ strains werebona fidemembers of theAlnus-Myricahost infecting group. They displayed significant
genomic divergence from genomospecies G1 ofAlnusinfecting strains (i.e. Frankia alni) and thus may
belong to another subspecies or genomospecies
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