Publikation: Autopolyploidy-driven range expansion of a temperate-originated plant to pan-tropic under global change
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Angiosperms are believed to have emerged initially in the tropics and expanded their distribution range polewards through diverse mechanisms, for example polyploidization‐driven cold‐tolerance evolution. Reversed expansion from temperate to pantropic climate through a polyploidization‐driven shift in heat‐tolerance remains largely unknown. Here, we found autopolyploidy in relation to the global expansion of Solidago canadensis from its temperate‐climate native range in North American to hot‐summer climate in an introduced range. Our cytogeographical study of 2062 accessions from 471 locations worldwide demonstrates that ploidy levels correlates negatively with latitude and positively with average temperature. An isotherm‐dependent shift of the climate niches at the threshold of 20‐24ºC between geo‐cytotypes can be attributed mainly to autopolyploidy‐driven differentiation of heat tolerance; only polyploids and not diploids are able to complete sexual reproduction, germinate and grow in the hot‐summer climate of low latitudes. Ploidy‐dependent fertility appears to play a key role in the hot‐summer introduced range in the northern hemisphere through both pre‐adaptation and rapid post‐introduction adaptive evolution of delayed flowering and improved heat‐tolerance during embryo development. MaxEnt model predicts continuous expansion of this plant species under global change. These results provide new insights into the mechanisms governing autopolyploidy‐driven backward range‐expansion of plant species from temperate origins.
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CHENG, Jiliang, Jun LI, Zheng ZHANG, Huan LU, Guoqi CHEN, Beibei YAO, Ying ZHANG, Yu ZHANG, Marc STIFT, Sheng QIANG, 2021. Autopolyploidy-driven range expansion of a temperate-originated plant to pan-tropic under global change. In: Ecological Monographs. Ecological Society of America (ESA). 2021, 91(2), e01445. ISSN 0012-9615. eISSN 1557-7015. Available under: doi: 10.1002/ecm.1445BibTex
@article{Cheng2021Autop-52324, year={2021}, doi={10.1002/ecm.1445}, title={Autopolyploidy-driven range expansion of a temperate-originated plant to pan-tropic under global change}, number={2}, volume={91}, issn={0012-9615}, journal={Ecological Monographs}, author={Cheng, Jiliang and Li, Jun and Zhang, Zheng and Lu, Huan and Chen, Guoqi and Yao, Beibei and Zhang, Ying and Zhang, Yu and Stift, Marc and Qiang, Sheng}, note={Article Number: e01445} }
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