Novel chloroplast DNA polymorphism in a sympatric region of two pines<sup>1</sup>

Govindaraju, Diddahally R.; Dancik, Bruce P.; Wagner, David B.

doi:10.1046/j.1420-9101.1989.2010049.x

Cited by 35 publications

(15 citation statements)

References 31 publications

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“…() and Govindaraju et al. () also detected new cpDNA variants in the region of contact. These new variants were proposed to be the result of either new mutations or recombination (Govindaraju et al.…”

Section: Discussionmentioning

confidence: 89%

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Godbout

Yeh

Bousquet

2012

Ecology and Evolution

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Jack pine (Pinus banksiana) and lodgepole pine (Pinus contorta var. latifolia) are two North American boreal hard pines that hybridize in their zone of contact in western Canada. The main objective of this study was to characterize their patterns of introgression resulting from past and recent gene flow, using cytoplasmic markers having maternal or paternal inheritance. Mitochondrial DNA (mtDNA) and chloroplast DNA (cpDNA) diversity was assessed in allopatric populations of each species and in stands from the current zone of contact containing morphological hybrids. Cluster analyses were used to identify genetic discontinuities among groups of populations. A canonical analysis was also conducted to detect putative associations among cytoplasmic DNA variation, tree morphology, and site ecological features. MtDNA introgression was extensive and asymmetric: it was detected in P. banksiana populations from the hybrid zone and from allopatric areas, but not in P. contorta populations. Very weak cpDNA introgression was observed, and only in P. banksiana populations. The mtDNA introgression pattern indicated that central Canada was first colonized by migrants from a P. contorta glacial population located west of the Rocky Mountains, before being replaced by P. banksiana migrating westward during the Holocene. In contrast, extensive pollen gene flow would have erased the cpDNA traces of this ancient presence of P. contorta. Additional evidence for this process was provided by the results of canonical analysis, which indicated that the current cpDNA background of trees reflected recent pollen gene flow from the surrounding dominant species rather than historical events that took place during the postglacial colonization.

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Section: Discussionmentioning

confidence: 89%

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Godbout

Yeh

Bousquet

2012

Ecology and Evolution

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“…It would cause the rate of selectively neutral molecular evolution to decrease asymptotically with increasing population size (33). Although chloroplasts are usually uniparentally inherited, biparental inheritance (16,(34)(35)(36) and putative chloroplast recombination (37) have been observed. Although rare, these factors could be a significant evolutionary force when considering long time spans.…”

Section: Resultsmentioning

confidence: 99%

Extensive variation in evolutionary rate of rbcL gene sequences among seed plants.

Bousquet

Strauss

Doerksen

et al. 1992

Proc. Natl. Acad. Sci. U.S.A.

256

167

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Extensive variation in synonymous and nonsynonymous rates of substitution was observed among 50 sequences of the gene coding for the large subunit of ribulose-1,5-bisphosphate carboxylase (rbcL) representing bryophyte, conifer, dicot, and monocot taxa. Relative rate tests revealed rate differences of up to 138% for nonsynonymous substitutions and up to 85% for synonymous ones. Within angiosperms, the annual forms evolved more rapidly, on average, than perennial forms. This rate heterogeneity was more extensive at nonsynonymous sites than synonymous ones, and it resulted primarily from a recent acceleration of substitution rate in many groups of angkosperms.

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“…Such a hypothesis has already been put forward to explain the high cpDNA variability observed in hybrid zones between related taxa (e.g. Govindaraju et al, 1989).…”

Section: Discussionmentioning

confidence: 96%

Inter-intraspecific variation of chloroplast DNA of European Plantago spp.

Hooglander

Lumaret²,

Bos

1993

Heredity

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Inter-and intraspecific chioroplast DNA variation in four species of Plantago (P. lanceolata, P. major, P. media and P. coronopus) were analysed by comparing DNA fragment patterns produced by seven restriction endonucleases. Plant material was collected in seven European countries. Only 21.3 per cent of the 409 restriction sites were shared by all four species. Phylogenetic analysis, performed by constructing the most parsimonious trees, showed that genetic differentiation in cpDNA was very high among P. lanceolata, P. coronopus and the species pair P. media and P. major, which were more closely related.At the intraspecific level, four restricted site mutations were detected. Most of the variation was due to numerous small length mutations, one of which (70 bp) discriminated between the two subspecies of P. major (i.e. ssp. major and ssp. pleiosperma). This mutation was used successfully to show that, in Denmark, cpDNA introgression occurs from pleiosperma into major in the areas where the two subspecies grow together, whereas previous studies of the same subspecies in the Netherlands suggested introgression in the reverse direction. In P. lanceolata, five distinct types of cpDNA genome could be distinguished, one of these being widely distributed. Therefore, DNA variation was present both between and within populations. In P. media, three distinct cpDNA genomes were found, one being specific to diploid and tetraploid material from the Pyrenees, suggesting multiple origins of the autotetraploids in this species. Whereas cpDNA variation was observed in the two outcrossing species of Plantago (P. media and P. lanceolata) no variation was detected in the two autogamous subspecies of P. major. This suggests that chioroplast DNA variation may be related to nuclear genome diversity.

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Novel chloroplast DNA polymorphism in a sympatric region of two pines¹

Cited by 35 publications

References 31 publications

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Extensive variation in evolutionary rate of rbcL gene sequences among seed plants.

Inter-intraspecific variation of chloroplast DNA of European Plantago spp.

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Novel chloroplast DNA polymorphism in a sympatric region of two pines1

Cited by 35 publications

References 31 publications

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Large‐scale asymmetric introgression of cytoplasmicDNAreveals Holocene range displacement in a North American boreal pine complex

Extensive variation in evolutionary rate of rbcL gene sequences among seed plants.

Inter-intraspecific variation of chloroplast DNA of European Plantago spp.

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Novel chloroplast DNA polymorphism in a sympatric region of two pines¹