The MG1363 and IL1403 Laboratory Strains of Lactococcus lactis and Several Dairy Strains Are Diploid

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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The MG1363 and IL1403 Laboratory Strains of Lactococcus lactis and Several Dairy Strains Are Diploid. / Michelsen, Ole; Hansen, Flemming G.; Albrechtsen, B.; Jensen, Peter Ruhdal.

In: Journal of Bacteriology, Vol. 192, No. 4, 2010, p. 1058-1065.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Michelsen, Ole; Hansen, Flemming G.; Albrechtsen, B.; Jensen, Peter Ruhdal / The MG1363 and IL1403 Laboratory Strains of Lactococcus lactis and Several Dairy Strains Are Diploid.

In: Journal of Bacteriology, Vol. 192, No. 4, 2010, p. 1058-1065.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{e3852b361af14792826b24284daaaeec,
title = "The MG1363 and IL1403 Laboratory Strains of Lactococcus lactis and Several Dairy Strains Are Diploid",
publisher = "American Society for Microbiology",
author = "Ole Michelsen and Hansen, {Flemming G.} and B. Albrechtsen and Jensen, {Peter Ruhdal}",
year = "2010",
doi = "10.1128/JB.00900-09",
volume = "192",
number = "4",
pages = "1058--1065",
journal = "Journal of Bacteriology",
issn = "0021-9193",

}

RIS

TY - JOUR

T1 - The MG1363 and IL1403 Laboratory Strains of Lactococcus lactis and Several Dairy Strains Are Diploid

A1 - Michelsen,Ole

A1 - Hansen,Flemming G.

A1 - Albrechtsen,B.

A1 - Jensen,Peter Ruhdal

AU - Michelsen,Ole

AU - Hansen,Flemming G.

AU - Albrechtsen,B.

AU - Jensen,Peter Ruhdal

PB - American Society for Microbiology

PY - 2010

Y1 - 2010

N2 - Bacteria are normally haploid, maintaining one copy of their genome in one circular chromosome. We have examined the cell cycle of laboratory strains of Lactococcus lactis, and, to our surprise, we found that some of these strains were born with two complete nonreplicating chromosomes. We determined the cellular content of DNA by flow cytometry and by radioactive labeling of the DNA. These strains thus fulfill the criterion of being diploid. Several dairy strains were also found to be diploid while a nondairy strain and several other dairy strains were haploid in slow-growing culture. The diploid and haploid strains differed in their sensitivity toward UV light, in their cell size, and in their D period, the period between termination of DNA replication and cell division.

AB - Bacteria are normally haploid, maintaining one copy of their genome in one circular chromosome. We have examined the cell cycle of laboratory strains of Lactococcus lactis, and, to our surprise, we found that some of these strains were born with two complete nonreplicating chromosomes. We determined the cellular content of DNA by flow cytometry and by radioactive labeling of the DNA. These strains thus fulfill the criterion of being diploid. Several dairy strains were also found to be diploid while a nondairy strain and several other dairy strains were haploid in slow-growing culture. The diploid and haploid strains differed in their sensitivity toward UV light, in their cell size, and in their D period, the period between termination of DNA replication and cell division.

U2 - 10.1128/JB.00900-09

DO - 10.1128/JB.00900-09

JO - Journal of Bacteriology

JF - Journal of Bacteriology

SN - 0021-9193

IS - 4

VL - 192

SP - 1058

EP - 1065

ER -