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Abstract:

In Argentina there are two different centers of maize diversity, the Northeastern (NEA) and the Northwestern (NWA) regions of the country. In NEA, morphological studies identified 15 landraces cultivated by the Guaraní communities in Misiones Province. In the present study we analyzed the karyotype diversity of 20 populations of Guaraní maize landraces through classical and molecular cytogenetic analyses. Our results demonstrate significant intra and inter-populational variation in the percentage, number, size, chromosome position and frequencies of the heterochromatic blocks, which are called knobs. Knob sequence analysis (180-bp and TR-1) did not show significant differences among Guaraní populations. B chromosomes were not detected, and abnormal 10 (AB10) chromosomes were found with low frequency (0.1f 0.40) in six populations. Our results allowed karyotypic characterization of each analyzed population, defining for the first time the chromosomal constitution of maize germplasm from NEA. The multivariate analysis (PCoA and UPGMA) of karyotype parameters allowed the distinction between two populations groups: the Popcorn and the Floury maize populations. These results are in agreement with previously published microsatellite and morphological/phenological studies. Finally, we compared our karyotype results with those previously reported for NWA and Central Region of South America maize. Our data suggest that there are important differences between maize from NEA and NWA at the karyotype level, supporting the hypothesis that there are two pathways of input of South America maize. Our results also confirm the existence of two centers of diversification of Argentinian native maize, NWA and NEA. This work contributes new knowledge about maize diversity, which is relevant for future plans to improve commercial maize, and for conservation of agrobiodiversity. © 2018 Realini et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Registro:

Documento: Artículo
Título:Exploring karyotype diversity of Argentinian Guaranímaize landraces: Relationship among South American maize
Autor:Realini, M.F.; Poggio, L.; Hernández, J.C.; González, G.E.
Filiación:Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Departamento de Ecología, Genética y Evolución, Laboratorio de Citogenética y Evolución (LaCyE), Ciudad Autónoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Ecología, Genética y Evolución (IEGEBA), Ciudad Autónoma de Buenos Aires, Argentina
Cátedra de Botánica Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:article; autosome; chromosome analysis; germplasm; human; human cell; karyotype; landrace; maize; nonhuman; sequence analysis; South America; Argentina; classification; comparative study; fluorescence in situ hybridization; genetic variation; genetics; karyotyping; maize; molecular evolution; phylogeny; plant chromosome; procedures; Argentina; Chromosomes, Plant; Evolution, Molecular; Genetic Variation; In Situ Hybridization, Fluorescence; Karyotyping; Phylogeny; South America; Zea mays
Año:2018
Volumen:13
Número:6
DOI: http://dx.doi.org/10.1371/journal.pone.0198398
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
CODEN:POLNC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v13_n6_p_Realini

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Citas:

---------- APA ----------
Realini, M.F., Poggio, L., Hernández, J.C. & González, G.E. (2018) . Exploring karyotype diversity of Argentinian Guaranímaize landraces: Relationship among South American maize. PLoS ONE, 13(6).
http://dx.doi.org/10.1371/journal.pone.0198398
---------- CHICAGO ----------
Realini, M.F., Poggio, L., Hernández, J.C., González, G.E. "Exploring karyotype diversity of Argentinian Guaranímaize landraces: Relationship among South American maize" . PLoS ONE 13, no. 6 (2018).
http://dx.doi.org/10.1371/journal.pone.0198398
---------- MLA ----------
Realini, M.F., Poggio, L., Hernández, J.C., González, G.E. "Exploring karyotype diversity of Argentinian Guaranímaize landraces: Relationship among South American maize" . PLoS ONE, vol. 13, no. 6, 2018.
http://dx.doi.org/10.1371/journal.pone.0198398
---------- VANCOUVER ----------
Realini, M.F., Poggio, L., Hernández, J.C., González, G.E. Exploring karyotype diversity of Argentinian Guaranímaize landraces: Relationship among South American maize. PLoS ONE. 2018;13(6).
http://dx.doi.org/10.1371/journal.pone.0198398