Karyotypic studies in wild germplasm of Arachis (Leguminosae)

The karyomorphology for eight diploid species of Arachis belonging to three sections has been described for the first time, Sect. Extranervosae: A. macedoi (2n = 20m) and A. retusa (2n = 14m + 6sm); Sect. Heteranthae: A. sylvestris (2n = 16m + 4sm); Sect. Procumbentes: A. chiquitana (2n = 18m + 2sm)...

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Bibliographic Details
Published in:Genetic resources and crop evolution 2009-09, Vol.56 (6), p.755-764
Main Authors: Lavia, Graciela I, Ortiz, Alejandra M, Fernández, Aveliano
Format: Article
Language:English
Subjects:
Agriculture
Arachis
Biomedical and Life Sciences
Chromosomes
Cruziana
Evolution
Germplasm
Karyotypes
Life Sciences
Plant Genetics and Genomics
Plant Physiology
Plant Sciences
Plant Systematics/Taxonomy/Biogeography
Research Article
Retusa
Satellite observation
Species
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Summary:The karyomorphology for eight diploid species of Arachis belonging to three sections has been described for the first time, Sect. Extranervosae: A. macedoi (2n = 20m) and A. retusa (2n = 14m + 6sm); Sect. Heteranthae: A. sylvestris (2n = 16m + 4sm); Sect. Procumbentes: A. chiquitana (2n = 18m + 2sm); Sect. Arachis: A. cruziana (2n = 18m + 2sm), A. herzogii (2n = 18m + 2sm), A. simpsonii (2n = 20m) and A. williamsii (2n = 20m). A pair of satellited chromosomes was observed in all species. A chromosomes were found in A. chiquitana, A. herzogii and A. simpsonii. Karyotypic differences between sections were observed, but not enough to establish a characteristic karyotype pattern for each section. However, the species may be differentiated by the presence of A chromosomes, the type and position of satellites, and the karyotype formulae. These results are discussed with regard to karyotype evolution in Arachis to contribute to understanding the role of chromosome changes in the evolution of the genus.
ISSN:0925-9864
1573-5109
DOI:10.1007/s10722-008-9399-6