Genome size variation in wild and cultivated maize along altitudinal gradients

被引:100
作者
Diez, Concepcion M. [1 ]
Gaut, Brandon S. [1 ]
Meca, Esteban [2 ]
Scheinvar, Enrique [3 ]
Montes-Hernandez, Salvador [4 ]
Eguiarte, Luis E. [3 ]
Tenaillon, Maud I. [5 ]
机构
[1] UC Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA
[2] UC Irvine, Dept Math, Irvine, CA 92607 USA
[3] Univ Nacl Autonoma Mexico, Inst Ecol, Dept Ecol Evolut, Mexico City 04510, DF, Mexico
[4] Inst Nacl Invest Forestales Agr & Pecuarias, Guanajuato 38110, Mexico
[5] Univ Paris 11, CNRS, UMR Genet Vegetale, AgroParisTech,INRA, Gif Sur Yvette, France
关键词
altitudinal gradient; climatic variables; DNA content; genome size; natural selection; Zea mays; NUCLEAR-DNA CONTENT; LEAST-SQUARES REGRESSION; QUANTILE REGRESSION; EVOLUTION; ZEA; DIVERSITY; POPULATION; MAYS; HYPOTHESIS; SELECTION;
D O I
10.1111/nph.12247
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:264 / 276
页数:13
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