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Abstract:

Background: Senecio is the largest genus in the Asteraceae family growing in all environments around the world. It displays taxonomic and systematical difficulties. Cytogenetic knowledge of this genus is ancient, scarce and mainly restricted to chromosome number records. Results: In this study we analyzed chromosome number, meiotic configuration, bivalent morphology, meiotic behavior and pollen grain stainability on 100 accessions of 27 different polyploid Senecio L. sect Senecio entities. Median, standard deviation and mode were calculated for number and position of chiasmata and meiotic recombination was statistically evaluated. Although high frequency of multivalents and associated meiotic irregularities are expected in high polyploids, bivalents predominance and, consequently, regular meiosis were observed, with normal sporogenesis and high pollen grain stainability. Conclusion: Depletion in the total chiasmata was significant only in some species but the terminal position was preferential in all the entities analyzed, indicating significant reduction in recombination. The regular meiosis observed suggest that intra and intergenomic reorganization process occur quickly and efficiently in this genus. Mechanisms of diploidization, common to all polyploids, are reinforced by the strong reduction in crossing-over rushing polyploids stabilization. © 2013 Lopez et al.; licensee Springer.

Registro:

Documento: Artículo
Título:Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)
Autor:Lopez, M.G.; Xifreda, C.C.; Poggio, L.; Wulff, A.F.
Filiación:CONICET, Laboratorio de Citogenética y Evolución (LACyE), Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, 4 piso, Int. Güiraldes 2620, C1428EHA, Buenos Aires, Argentina
CIC-PBA, Laboratorio de Etnobotánica y Botánica Aplicada (LEBA), Universidad Nacional de La Plata, Calle 64 No 3, 1900, La Plata, Argentina
Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria (INTA), Dr. N. Repetto y Los Reseros s/n, 1686, Hurlingham, Argentina
Laboratorio de Citogenética y Evolución (LACyE), Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, 4 piso. Lab 61, Intendente Güiraldes 2160, C1428EHA Buenos Aires, Argentina
Palabras clave:Chiasmata; Chromosome number; Cytogenetics; Meiotic analysis; Meiotic recombination; Senecio
Año:2013
Volumen:54
Número:1
DOI: http://dx.doi.org/10.1186/1999-3110-54-20
Título revista:Botanical Studies
Título revista abreviado:Bot. Stud.
ISSN:1817406X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1817406X_v54_n1_p_Lopez

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Citas:

---------- APA ----------
Lopez, M.G., Xifreda, C.C., Poggio, L. & Wulff, A.F. (2013) . Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae). Botanical Studies, 54(1).
http://dx.doi.org/10.1186/1999-3110-54-20
---------- CHICAGO ----------
Lopez, M.G., Xifreda, C.C., Poggio, L., Wulff, A.F. "Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)" . Botanical Studies 54, no. 1 (2013).
http://dx.doi.org/10.1186/1999-3110-54-20
---------- MLA ----------
Lopez, M.G., Xifreda, C.C., Poggio, L., Wulff, A.F. "Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae)" . Botanical Studies, vol. 54, no. 1, 2013.
http://dx.doi.org/10.1186/1999-3110-54-20
---------- VANCOUVER ----------
Lopez, M.G., Xifreda, C.C., Poggio, L., Wulff, A.F. Deep cytogenetics analysis reveals meiotic recombination depletion in species of Senecio (Asteraceae). Bot. Stud. 2013;54(1).
http://dx.doi.org/10.1186/1999-3110-54-20