期刊
NEW PHYTOLOGIST
卷 232, 期 4, 页码 1765-1777出版社
WILEY
DOI: 10.1111/nph.17671
关键词
adaptive evolution; ancestry; chromosomal translocation; domestication; soybeans
资金
- Agriculture and Food Research Initiative competitive grants of the USDA National Institute of Food and Agriculture [2015-67013-22811, 2017-6701327425]
- North Central Soybean Research Program
- Indiana Soybean Alliance
The study reveals that a chromosomal translocation in soybeans, mediated by transposons, played a key role in evolution and led to semisterility and adaptations. This translocation caused differentiation among soybean populations in different regions, highlighting an evolutionary link between G. gracilis and cultivated soybean.
Large structural variations frequently occur in higher plants; however, the impact of such variations on plant diversification, adaptation and domestication remains elusive. Here, we mapped and characterised a reciprocal chromosomal translocation in soybeans and assessed its effects on diversification and adaptation of wild (Glycine soja) and semiwild (Glycine gracilis) soybeans, and domestication of cultivated soybean (Glycine max), by tracing the distribution of the translocation in the USDA Soybean Germplasm Collection and population genetics analysis. We demonstrate that the translocation occurred through CACTA transposon-mediated chromosomal breakage in wild soybean c. 0.34 Ma and is responsible for semisterility in translocation heterozygotes and reduces their reproductive fitness. The translocation has differentiated Continental (i.e. China and Russia) populations from Maritime (i.e. Korea and Japan) populations of G. soja and predominately adapted to cold and dry climates. Further analysis revealed that the divergence of G. max from G. soja predates the translocation event and that G. gracilis is an evolutionary intermediate between G. soja and G. max. Our results highlight the effects of a chromosome rearrangement on the processes leading to plant divergence and adaptation, and provides evidence that suggests G. gracilis, rather than G. soja, as the ancestor of cultivated soybean.
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