Contrasting rDNA Evolution in Lima Bean (Phaseolus lunatus L.) and Common Bean (P. vulgaris L., Fabaceae).
Summary of "Contrasting rDNA Evolution in Lima Bean (Phaseolus lunatus L.) and Common Bean (P. vulgaris L., Fabaceae)."
Phaseolus vulgaris has two 5S rDNA sites in chromosomes 6 and 10 and from two up to nine 45S rDNA sites depending on the accession. The presence of three 45S rDNA sites, in chromosomes 6, 9 and 10, is considered the ancestral state for the species. For P. lunatus, only one 5S and one 45S rDNA sites in distinct chromosomes were known. In order to investigate the homeologies among these rDNA-bearing chromosomes and the stability of the rDNA sites in P. lunatus, rDNA and P. vulgaris chromosome-specific probes were hybridized in situ to P. lunatus. The chromosomes bearing the 5S and the 45S rDNA of P. lunatus are homeologous to chromosomes 10 and 6 of P. vulgaris, respectively. In contrast to the common bean, no variation in the number of rDNA loci was detected, except for a duplication of the 5S rDNA in the same chromosome in a small group of cultivars. These results suggest that the 5S rDNA site in chromosome 10 and the 45S rDNA site in chromosome 6 represent the ancestral loci in the genus. The 5S rDNA site in chromosome 10 of P. vulgaris is located in the long arm, while in P. lunatus it is present in the short arm, suggesting the occurrence of a transposition or a pericentric inversion after separation of both lineages.
Affiliation
Laboratory of Plant Cytogenetics, Department of Botany, Federal University of Pernambuco, Recife, Brazil.
Journal Details
This article was published in the following journal.
Name: Cytogenetic and genome research
ISSN: 1424-859X
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21063080
- DOI: http://dx.doi.org/10.1159/000321677
Medical and Biotech [MESH] Definitions
Phytohemagglutinins
Mucoproteins isolated from the kidney bean (Phaseolus vulgaris); some of them are mitogenic to lymphocytes, others agglutinate all or certain types of erythrocytes or lymphocytes. They are used mainly in the study of immune mechanisms and in cell culture.
Castor Bean
Common name for Ricinus communis, a species in the family EUPHORBIACEAE. It is the source of CASTOR OIL.
Exobiology
The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.
Evolution, Molecular
Evolution at the molecular level of DNA sequences and proteins. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)
Directed Molecular Evolution
The techniques used to produce molecules exhibiting properties that conform to the demands of the experimenter. These techniques combine methods of generating structural changes with methods of selection. They are also used to examine proposed mechanisms of evolution under in vitro selection conditions.
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