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Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot.

Publication ,  Journal Article
Han, T-S; Hu, Z-Y; Du, Z-Q; Zheng, Q-J; Liu, J; Mitchell-Olds, T; Xing, Y-W
Published in: Plant diversity
September 2022

Polyploids contribute substantially to plant evolution and biodiversity; however, the mechanisms by which they succeed are still unclear. According to the polyploid adaptation hypothesis, successful polyploids spread by repeated adaptive responses to new environments. Here, we tested this hypothesis using two tetraploid yellowcresses (Rorippa), the endemic Rorippa elata and the widespread Rorippa palustris, in the temperate biodiversity hotspot of the Hengduan Mountains. Speciation modes were resolved by phylogenetic modeling using 12 low-copy nuclear loci. Phylogeographical patterns were then examined using haplotypes phased from four plastid and ITS markers, coupled with historical niche reconstruction by ecological niche modeling. We inferred the time of hybrid origins for both species as the mid-Pleistocene, with shared glacial refugia within the southern Hengduan Mountains. Phylogeographic and ecological niche reconstruction indicated recurrent northward colonization by both species after speciation, possibly tracking denuded habitats created by glacial retreat during interglacial periods. Common garden experiment involving perennial R. elata conducted over two years revealed significant changes in fitness-related traits across source latitudes or altitudes, including latitudinal increases in survival rate and compactness of plant architecture, suggesting gradual adaptation during range expansion. These findings support the polyploid adaptation hypothesis and suggest that the spread of polyploids was aided by adaptive responses to environmental changes during the Pleistocene. Our results thus provide insight into the evolutionary success of polyploids in high-altitude environments.

Duke Scholars

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Published In

Plant diversity

DOI

EISSN

2468-2659

ISSN

2096-2703

Publication Date

September 2022

Volume

44

Issue

5

Start / End Page

455 / 467
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Han, T.-S., Hu, Z.-Y., Du, Z.-Q., Zheng, Q.-J., Liu, J., Mitchell-Olds, T., & Xing, Y.-W. (2022). Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot. Plant Diversity, 44(5), 455–467. https://doi.org/10.1016/j.pld.2022.02.002
Han, Ting-Shen, Zheng-Yan Hu, Zhi-Qiang Du, Quan-Jing Zheng, Jia Liu, Thomas Mitchell-Olds, and Yao-Wu Xing. “Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot.Plant Diversity 44, no. 5 (September 2022): 455–67. https://doi.org/10.1016/j.pld.2022.02.002.
Han T-S, Hu Z-Y, Du Z-Q, Zheng Q-J, Liu J, Mitchell-Olds T, et al. Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot. Plant diversity. 2022 Sep;44(5):455–67.
Han, Ting-Shen, et al. “Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot.Plant Diversity, vol. 44, no. 5, Sept. 2022, pp. 455–67. Epmc, doi:10.1016/j.pld.2022.02.002.
Han T-S, Hu Z-Y, Du Z-Q, Zheng Q-J, Liu J, Mitchell-Olds T, Xing Y-W. Adaptive responses drive the success of polyploid yellowcresses (Rorippa, Brassicaceae) in the Hengduan Mountains, a temperate biodiversity hotspot. Plant diversity. 2022 Sep;44(5):455–467.

Published In

Plant diversity

DOI

EISSN

2468-2659

ISSN

2096-2703

Publication Date

September 2022

Volume

44

Issue

5

Start / End Page

455 / 467