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Wang C, Yap ZY, Wan P, Chen K, Folk RA, Damrel DZ, Barger W, Diamond A, Horn C, Landry GP, Samarakoon T, Harvey S, Morgan DR, Qiu Y, Li P. Molecular phylogeography and historical demography of a widespread herbaceous species from eastern North America, Podophyllum peltatum. Am J Bot 2023; 110:e16254. [PMID: 37938809 DOI: 10.1002/ajb2.16254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 09/22/2023] [Accepted: 09/25/2023] [Indexed: 11/10/2023]
Abstract
PREMISE Glacial/interglacial cycles and topographic complexity are both considered to have shaped today's diverse phylogeographic patterns of taxa from unglaciated eastern North America (ENA). However, few studies have focused on the phylogeography and population dynamics of wide-ranging ENA herbaceous species occurring in forest understory habitat. We examined the phylogeographic pattern and evolutionary history of Podophyllum peltatum L., a widely distributed herb inhabiting deciduous forests of ENA. METHODS Using chloroplast DNA (cpDNA) sequences and nuclear microsatellite loci, we investigated the population structure and genetic diversity of the species. Molecular dating, demographic history analyses, and ecological niche modeling were also performed to illustrate the phylogeographic patterns. RESULTS Our cpDNA results identified three main groups that are largely congruent with boundaries along the Appalachian Mountains and the Mississippi River, two major geographic barriers in ENA. Populations located to the east of the Appalachians and along the central Appalachians exhibited relatively higher levels of genetic diversity. Extant lineages may have diverged during the late Miocene, and range expansions of different groups may have happened during the Pleistocene glacial/interglacial cycles. CONCLUSIONS Our findings indicate that geographic barriers may have started to facilitate the population divergence in P. peltatum before the Pleistocene. Persistence in multiple refugia, including areas around the central Appalachians during the Quaternary glacial period, and subsequent expansions under hospitable climatic condition, especially westward expansion, are likely responsible for the species' contemporary genetic structure and phylogeographic pattern.
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Affiliation(s)
- Chenxi Wang
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Zhao-Yan Yap
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Penglei Wan
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Kuangqi Chen
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Ryan A Folk
- Department of Biological Sciences, Mississippi State University, Starkville, Mississippi, 39762, USA
| | - Dixie Z Damrel
- Department of Biological Sciences, Clemson University, Clemson, South Carolina, 29634-0314, USA
| | - Wayne Barger
- Department of Conservation and Natural Resources, State Lands Division, Natural Heritage Section, Montgomery, Alabama, 36130, USA
| | - Alvin Diamond
- Department of Biological and Environmental Sciences, Troy University, Troy, Alabama, 36082, USA
| | - Charles Horn
- Department of Sciences and Mathematics, Newberry College, Newberry, South Carolina, 29108, USA
| | | | | | - Stephanie Harvey
- Department of Biology, Georgia Southwestern State University, Americus, Georgia, 31709-4376, USA
| | - David R Morgan
- Department of Natural Sciences, University of West Georgia, Carrollton, Georgia, 30118-2220, USA
| | - Yingxiong Qiu
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
- Plant Biodiversity Research Centre, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, Hubei, 430074, China
| | - Pan Li
- Systematic & Evolutionary Botany and Biodiversity group, MOE Laboratory of Biosystem Homeostasis and Protection, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, 310058, China
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Dion PP, Brisson J, Fontaine B, Lapointe L. Light acclimation strategies change from summer green to spring ephemeral as wild-leek plants age. Am J Bot 2016; 103:963-970. [PMID: 27208363 DOI: 10.3732/ajb.1500503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 04/07/2016] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY Spring-ephemeral forest-herbs emerge early to take advantage of the high-light conditions preceding canopy closure; they complete their life cycle in a few weeks, then senesce as the tree canopy closes. Summer greens acclimate their leaves to shade and thus manage to maintain a net carbon gain throughout summer. Differences in phenology among life stages within a species have been reported in tree saplings, whose leaf activity may extend beyond the period of shade conditions caused by mature trees. Similar phenological acclimation has seldom been studied in forest herbs. METHODS We compared wild-leek bulb growth and leaf phenology among plants from seedling to maturity and from under 4 to 60% natural light availability. We also compared leaf chlorophyll content and chl a/b ratio among seedlings and adult plants in a natural population as an indicator of photosynthetic capacity and acclimation to light environment. KEY RESULTS Overall, younger plants senesced later than mature ones. Increasing light availability delayed senescence in mature plants, while hastening seedling senescence. In natural populations, only seedlings acclimated to the natural reduction in light availability through time. CONCLUSIONS Wild-leek seedlings exhibit a summer-green phenology, whereas mature plants behave as true spring ephemerals. Growth appears to be more source-limited in seedlings than in mature plants. This modulation of phenological strategy, if confirmed in other species, would require a review of the current classification of species as either spring ephemerals, summer greens, wintergreens, or evergreens.
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Affiliation(s)
- Pierre-Paul Dion
- Département de phytologie, Université Laval, Québec, Québec, Canada and Centre de recherche en innovation sur les végétaux, Québec, Québec, Canada
| | - Jacques Brisson
- Institut de recherche en biologie végétale, Université de Montréal, Montréal, Québec, Canada and Center for Forest Research, Québec, Canada
| | - Bastien Fontaine
- Institut de recherche en biologie végétale, Université de Montréal, Montréal, Québec, Canada and Center for Forest Research, Québec, Canada
| | - Line Lapointe
- Département de biologie, Université Laval, Québec, Canada and Center for Forest Research, Québec, Canada
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