Mitochondrial genome of Thymus vulgaris L. (Labiate) is highly polymorphic between and among natural populations

Belhassen, E.; Atlan, Anne; Couvet, Denis; Gouyon, Pierre‐Henri; Quétier, Françis

doi:10.1038/hdy.1993.164

Cited by 51 publications

(35 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…RFLP analysis using cloned mtDNA genes as probes has been applied a number of times to detect and survey mtDNA variation in plant populations (Belhassen et al, 1993;Dong & Wagner, 1993;Samitou-Laprade et al, 1993;Strauss et al, 1993;Ronfort et al, 1995). Interpretation of such RFLP data relies on the assumption that the fragments detected are located in the mitochondrial genome and do not represent sequences that have been transferred to the nucleus (Strauss et al, 1993).…”

Section: Discussionmentioning

confidence: 99%

Multiple origins for Scots pine (Pinus sylvestris L.) in Scotland: evidence from mitochondrial DNA variation

1998

View full text Add to dashboard Cite

Data from the pollen record and from two forms of nuclear genetic markers suggest that present-day populations of Scots pine (Pinus sylvestris L.) in Scotland were derived from more than one refugium after glaciation. In order to clarify this issue, genetic variation for maternally inherited mitochondrial DNA (mtDNA) was studied in 466 trees sampled from 20 natural populations in Scotland. A homologous probe for the cox1 mitochondrial gene of P. sylvestris was constructed and used to detect mtDNA RFLP variation. Two common (a and b) and one rare RFLP variant (c) were distinguished. Evidence from segregation patterns of variants within a polymorphic population was consistent with maternal inheritance of the RFLP variation. A survey of Scottish populations indicates that mitotype a is present at all sites, but that mitotype b is confined to three western populations. Genetic differentiation for mtDNA, which migrates solely by seed is much greater (F ST(m) = 0.370) than for nuclear markers (F ST(b) = 0.028) which are dispersed by both pollen and seed. The geographical distribution of mitotype b in western Scotland, and its absence from populations in northern France and Germany, suggest that P. sylvestris has been derived not only from continental Europe via England, but also by migration from a western refugium, probably in Ireland or western France.

show abstract

Section: Discussionmentioning

confidence: 99%

Multiple origins for Scots pine (Pinus sylvestris L.) in Scotland: evidence from mitochondrial DNA variation

1998

View full text Add to dashboard Cite

show abstract

“…For example, low genetic diversity at self-incompatibility loci reduces availability of compatible mates, resulting in reduced seed set (Byers and Meagher, 1992). Similarly, sex ratio dynamics of gynodioecious populations are typically determined by an interplay between cytoplasmic male sterility (cms) effects and genetic diversity at nuclear male fertility restorer loci (van Damme, 1986;Belhassen et al, 1993;Saumitou-Laprade et al, 1994;McCauley and Taylor, 1997;Charlesworth and Laporte, 1998;Dudle et al, 2001;Laporte et al, 2001). In the case of gynodioecy, genetic drift in small populations may result in loss of genetic diversity at restorer loci, which in turn would lead to a reduction in male function within populations, ultimately reducing seed set.…”

Section: Introductionmentioning

confidence: 99%

Consequences of prairie fragmentation on the progeny sex ratio of a gynodioecious species, Lobelia spicata (Campanulaceae)

2005

View full text Add to dashboard Cite

Habitat fragmentation of prairie ecosystems has resulted in increased isolation and decreased size of plant populations. In large populations, frequency-dependent selection is expected to maintain genetic diversity of sex determining factors associated with gynodioecy, that is, nuclear restorer genes that reverse cytoplasmic male sterility (nucleocytoplasmic gynodioecy). However, genetic drift will have a greater influence on small isolated populations that result from habitat fragmentation. The genetic model for nucleocytoplasmic gynodioecy implies that the proportion of female progeny produced by hermaphroditic and female plants will show more extreme differences in populations with reduced allelic diversity, and that restoration of male function will increase with inbreeding. We investigated potential impacts of effects resulting from reduced population sizes by comparison of progeny sex ratios produced by female and hermaphroditic plants in small and large populations of the gynodioecious prairie species, Lobelia spicata. A four-way contingency analysis of the impact of population size, population sex ratio, and maternal gender on progeny sex ratios showed that progeny sex ratios of hermaphroditic plants were strongly influenced by population size, whereas progeny sex ratios of female plants were strongly influenced by population sex ratio. Further, analysis of variation in progeny-type distribution indicated decreased restoration and increased loss of male function in smaller and isolated populations. These results are consistent with reduced allelic diversity or low allelic frequency at restorer loci in small and isolated populations. The consequent decrease in male function has the potential to impede seed production in these fragmented prairies. Heredity (2005) 95, 69-75.

show abstract

“…However, even without identified CMS genes, sequence variants anywhere in the mitochondrial genome could provide helpful genetic markers, allowing identification of plants' cytoplasmic genotypes, assuming strictly maternal inheritance, and no (or rare) recombination. Mitochondrial genome variants indeed exist in several gynodioecious plants, and distinct haplotypes coexisting within popu-lations probably sometimes correspond to different CMS types (Belhassen et al, 1993;DeHaan et al, 1997;Desplanque et al, 2000;Olson and McCauley, 2002). In species whose chloroplasts are maternally transmitted, variants in the chloroplast genome are equally useful, since the mitochondrial and chloroplast genes should be completely linked.…”

mentioning

confidence: 99%

Plant Population Genetics: What maintains male-sterility factors in plant populations?

Charlesworth

2002

Heredity

View full text Add to dashboard Cite

Heredity chromosome of the serotype III strain, no complete temperate phage genomes were identified. Interestingly, three copies of a 47 kb sequence were present that had the characteristics of an integrative plasmid. These elements may also be important for horizontal gene transfer in GBS.Tettelin and colleagues estimated that 650 proteins encoded by the serotype V genome were surface exposed and therefore were potential virulence factors. They then used a proteomic approach to identify which of these proteins was expressed.Of 291 recombinant proteins made from this group and used to immunize mice, 139 sera were found to recognize a major GBS protein, 55 of which were shown by fluorescence-activated cell sorter analysis to be expressed on the cell surface. These data are important for understanding the physiology of GBS, as well as identifying new candidate antigens for vaccine development.A remarkably large number of twocomponent regulatory systems were found in both new GBS genomes, com-

show abstract

Mitochondrial genome of Thymus vulgaris L. (Labiate) is highly polymorphic between and among natural populations

Cited by 51 publications

References 34 publications

Multiple origins for Scots pine (Pinus sylvestris L.) in Scotland: evidence from mitochondrial DNA variation

Multiple origins for Scots pine (Pinus sylvestris L.) in Scotland: evidence from mitochondrial DNA variation

Consequences of prairie fragmentation on the progeny sex ratio of a gynodioecious species, Lobelia spicata (Campanulaceae)

Plant Population Genetics: What maintains male-sterility factors in plant populations?

Contact Info

Product

Resources

About