Evolutionary Applications | |
Seed fates in crop–wild hybrid sunflower: crop allele and maternal effects | |
Brian A. Pace2  Helen M. Alexander1  Jason D. Emry3  | |
[1] Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS, USA;Department of Horticulture and Crop Science, Ohio State University, Columbus, OH, USA;Department of Biology, Washburn University, Topeka, KS, USA | |
关键词: dormancy; gene flow; hybridization; introgression; maternal effects; seed banks; sunflower; | |
DOI : 10.1111/eva.12236 | |
来源: Wiley | |
【 摘 要 】
Domestication has resulted in selection upon seed traits found in wild populations, yet crop-wild hybrids retain some aspects of both parental phenotypes. Seed fates of germination, dormancy, and mortality can influence the success of crop allele introgression in crop-wild hybrid zones, especially if crop alleles or crop-imparted seed coverings result in out-of-season germination. We performed a seed burial experiment using crop, wild, and diverse hybrid sunflower (Helianthus annuus) cross types to test how a cross type's maternal parent and nuclear genetic composition might affect its fate under field conditions. We observed higher maladaptive fall germination in the crop- and F1- produced seeds than wild-produced seeds and, due to an interaction with percent crop alleles, fall germination was higher for cross types with more crop-like nuclear genetics. By spring, crop-produced cross types had the highest overwintering mortality, primarily due to higher fall germination. Early spring germination was identical across maternal types, but germination continued for F1-produced seeds. In conclusion, the more wild-like the maternal parent or the less proportion of the cross type's genome contributed by the crop, the greater likelihood a seed will remain ungerminated than die. Wild-like dormancy may facilitate introgression through future recruitment from the soil seed bank.Abstract
【 授权许可】
CC BY
© 2014 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd.
Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
【 预 览 】
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