FUENTES-SORIANO, Sara and Petr BUREŠ. Phylogeny, chromosome number and genome size evolution in Physarieae (Brassicaceae). In Botany 2008. 2008.
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Basic information
Original name Phylogeny, chromosome number and genome size evolution in Physarieae (Brassicaceae).
Name in Czech Phylogeny, chromosome number and genome size evolution in Physarieae (Brassicaceae).
Authors FUENTES-SORIANO, Sara (484 Mexico) and Petr BUREŠ (203 Czech Republic, guarantor).
Edition Botany 2008, 2008.
Other information
Original language English
Type of outcome Conference abstract
Field of Study 10600 1.6 Biological sciences
Country of publisher Canada
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/00216224:14310/08:00026032
Organization unit Faculty of Science
Keywords in English Mustard; genome size; Brassicaceae; Physarieae; phylogeny
Tags Brassicaceae, genome size, Mustard, phylogeny, Physarieae
Tags International impact
Changed by Changed by: prof. RNDr. Petr Bureš, Ph.D., učo 2635. Changed: 4/6/2008 11:08.
Abstract
The Physarieae tribe (Brassicaceae or mustard family), predominately with a base chromosome number of x=8, exhibits a remarkable diversity of haploid chromosome number, thereby suggesting a dynamic rate of chromosomal change. The goal of this research was to study, in a molecular phylogenetic context, the evolution of chromosome number and genome size within the tribe. Our molecular phylogenetic studies were generated with three independent loci (chloroplast ndhF, nrDNA ITS, and LUMINIDEPENDENS 5-7 exons and 5, 6 introns). The results suggest that Physarieae is a monophyletic lineage closest related to the Halimolobeae tribe. Within the tribe, three monophyletic clades are recovered: The NDDLS clade including five genera (Nerisyrenia, Dithyrea, Dimorphocarpa, Lyrocarpa, and Synthlipsis), the Paysonia clade, and the Physaria clade. The phylogenetic findings further suggest that there was a 2-fold genome size expansion after the divergence of Physarieae from closely related tribes (2C = 0.873 vs. 0.47 pg). The genome size of Physarieae has fluctuated widely during the evolution of Physarieae, and both genome size expansion and contraction occurred repeatedly. Overall DNA contents of Physarieae ranged from 0.5 to 4.364 pg/2C. Between the three major lineages of Physarieae, the Physaria clade showed the largest genome size on average, a finding that is rather unexpected considering known patterns of variation in other Brassicaceae. In Physarieae no obvious correlation was found between changes in genome size and chromosome number.
Abstract (in Czech)
The Physarieae tribe (Brassicaceae or mustard family), predominately with a base chromosome number of x=8, exhibits a remarkable diversity of haploid chromosome number, thereby suggesting a dynamic rate of chromosomal change. The goal of this research was to study, in a molecular phylogenetic context, the evolution of chromosome number and genome size within the tribe. Our molecular phylogenetic studies were generated with three independent loci (chloroplast ndhF, nrDNA ITS, and LUMINIDEPENDENS 5-7 exons and 5, 6 introns). The results suggest that Physarieae is a monophyletic lineage closest related to the Halimolobeae tribe. Within the tribe, three monophyletic clades are recovered: The NDDLS clade including five genera (Nerisyrenia, Dithyrea, Dimorphocarpa, Lyrocarpa, and Synthlipsis), the Paysonia clade, and the Physaria clade. The phylogenetic findings further suggest that there was a 2-fold genome size expansion after the divergence of Physarieae from closely related tribes (2C = 0.873 vs. 0.47 pg). The genome size of Physarieae has fluctuated widely during the evolution of Physarieae, and both genome size expansion and contraction occurred repeatedly. Overall DNA contents of Physarieae ranged from 0.5 to 4.364 pg/2C. Between the three major lineages of Physarieae, the Physaria clade showed the largest genome size on average, a finding that is rather unexpected considering known patterns of variation in other Brassicaceae. In Physarieae no obvious correlation was found between changes in genome size and chromosome number.
Links
LC06073, research and development projectName: Centrum pro výzkum biodiverzity
Investor: Ministry of Education, Youth and Sports of the CR, Biodiversity Research Center
MSM0021622416, plan (intention)Name: Diverzita biotických společenstev a populací: kauzální analýza variability v prostoru a čase
Investor: Ministry of Education, Youth and Sports of the CR, Diversity of Biotic Communities and Populations: Causal Analysis of variation in space and time
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