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Hybridization and genome size evolution: timing and magnitude of nuclear DNA content increases in Helianthus homoploid hybrid species

Baack, Eric J. ; Whitney, Kenneth D. ; Rieseberg, Loren H.

The New phytologist, 2005-08, Vol.167 (2), p.623-630 [Periódico revisado por pares]

Oxford, UK: Blackwell Science

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Título:
Hybridization and genome size evolution: timing and magnitude of nuclear DNA content increases in Helianthus homoploid hybrid species
Autor: Baack, Eric J. ; Whitney, Kenneth D. ; Rieseberg, Loren H.
Assuntos: Agronomy. Soil science and plant productions ; Biological and medical sciences ; C‐value ; DNA ; DNA, Plant - analysis ; DNA, Plant - genetics ; evolution ; flow cytometry ; Fundamental and applied biological sciences. Psychology ; Genetic hybridization ; Genetic variation ; Genetics and breeding of economic plants ; genome ; Genome size ; Genome, Plant ; Genomes ; Genomics ; Helianthus ; Helianthus - genetics ; Helianthus annuus ; Helianthus anomalus ; Helianthus deserticola ; Helianthus paradoxus ; Helianthus petiolaris ; Hybridity ; hybridization ; Hybridization, Genetic ; Interspecific and intergeneric hybridization, introgressions ; nuclear DNA content ; nuclear–cytoplasmic interaction ; nucleic acid hybridization ; Plant breeding: fundamental aspects and methodology ; plant genetics ; Plants ; Polyploidy ; speciation ; Species Specificity ; Sunflowers
É parte de: The New phytologist, 2005-08, Vol.167 (2), p.623-630
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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Descrição: • Hybridization and polyploidy can induce rapid genomic changes, including the gain or loss of DNA, but the magnitude and timing of such changes are not well understood. The homoploid hybrid system in Helianthus (three hybrid-derived species and their two parents) provides an opportunity to examine the link between hybridization and genome size changes in a replicated fashion. • Flow cytometry was used to estimate the nuclear DNA content in multiple populations of three homoploid hybrid Helianthus species (Helianthus anomalus, Helianthus deserticola, and Helianthus paradoxus), the parental species (Helianthus annuus and Helianthus petiolaris), synthetic hybrids, and natural hybrid-zone populations. • Results confirm that hybrid-derived species have 50% more nuclear DNA than the parental species. Despite multiple origins, hybrid species were largely consistent in their DNA content across populations, although H. deserticola showed significant interpopulation differences. First- and sixth-generation synthetic hybrids and hybrid-zone plants did not show an increase from parental DNA content. First-generation hybrids differed in DNA content according to the maternal parent. • In summary, hybridization by itself does not lead to increased nuclear DNA content in Helianthus, and the evolutionary forces responsible for the repeated increases in DNA content seen in the hybrid-derived species remain mysterious.
Editor: Oxford, UK: Blackwell Science
Idioma: Inglês

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Hybridization and genome size evolution: timing and magnitude of nuclear DNA content increases in Helianthus homoploid hybrid species

Baack, Eric J. ; Whitney, Kenneth D. ; Rieseberg, Loren H.

Oxford, UK: Blackwell Science

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