Genome size variation in wild and cultivated maize along altitudinal gradients


Por: Díez C.M., Gaut B.S., Meca E., Scheinvar E., Montes-Hernandez S., Eguiarte L.E., Tenaillon M.I.

Publicada: 1 jul 2013
Resumen:
It is still an open question as to whether genome size (GS) variation is shaped by natural selection. One approach to address this question is a population-level survey that assesses both the variation in GS and the relationship of GS to ecological variants. We assessed GS in Zea mays, a species that includes the cultivated crop, maize, and its closest wild relatives, the teosintes. We measured GS in five plants of each of 22 maize landraces and 21 teosinte populations from Mexico sampled from parallel altitudinal gradients. GS was significantly smaller in landraces than in teosintes, but the largest component of GS variation was among landraces and among populations. In maize, GS correlated negatively with altitude; more generally, the best GS predictors were linked to geography. By contrast, GS variation in teosintes was best explained by temperature and precipitation. Overall, our results further document the size flexibility of the Zea genome, but also point to a drastic shift in patterns of GS variation since domestication. We argue that such patterns may reflect the indirect action of selection on GS, through a multiplicity of phenotypes and life-history traits. © 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.

Filiaciones:
Díez C.M.:
 Department of Ecology and Evolutionary Biology, UC Irvine, Irvine, CA 92697, United States

Gaut B.S.:
 Department of Ecology and Evolutionary Biology, UC Irvine, Irvine, CA 92697, United States

Meca E.:
 Department of Mathematics, UC Irvine, Irvine, CA 92607, United States

Scheinvar E.:
 Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico

Montes-Hernandez S.:
 Campo Experimental Bajío, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Celaya, Guanajuato, CP 38110, Mexico

Eguiarte L.E.:
 Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico

Tenaillon M.I.:
 CNRS, UMR de Génétique Végétale, INRA/CNRS/Univ Paris-Sud/AgroParisTech, Ferme du Moulon, Gif-sur-Yvette, France
ISSN: 0028646X
Editorial
Blackwell Publishing Ltd, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA, Estados Unidos America
Tipo de documento: Article
Volumen: 199 Número: 1
Páginas: 264-276
WOS Id: 000319520200026
ID de PubMed: 23550586
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