期刊
MOLECULAR ECOLOGY
卷 20, 期 7, 页码 1378-1388出版社
WILEY
DOI: 10.1111/j.1365-294X.2011.05013.x
关键词
diversifying selection; F-ST and Q(ST); invasive species; quantitative trait; ragweed
资金
- department of Sante des Plantes et Environnement at INRA, University of Burgundy
- Regional Council of Burgundy, France
- National Research Council of Science & Technology (NST), Republic of Korea [KGM0151123] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The impact of natural selection on the adaptive divergence of invasive populations can be assessed by testing the null hypothesis that the extent of quantitative genetic differentiation (Q(ST)) would be similar to that of neutral molecular differentiation (F-ST). Using eight microsatellite loci and a common garden approach, we compared Q(ST) and F-ST among ten populations of an invasive species Ambrosia artemisiifolia (common ragweed) in France. In a common garden study with varying water and nutrient levels, we measured Q(ST) for five traits (height, total biomass, reproductive allocation, above- to belowground biomass ratio, and days to flowering). Although low F-ST indicated weak genetic structure and strong gene flow among populations, we found significant diversifying selection (Q(ST) > F-ST) for reproductive allocation that may be closely related to fitness. It suggests that abiotic conditions may have exerted selection pressure on A. artemisiifolia populations to differentiate adaptively, such that populations at higher altitude or latitude evolved greater reproductive allocation. As previous studies indicate multiple introductions from various source populations of A. artemisiifolia in North America, our results suggest that the admixture of introduced populations may have increased genetic diversity and additive genetic variance, and in turn, promoted the rapid evolution and adaptation of this invasive species.
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