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
Bronze
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