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Extreme diversification of floral volatiles within and among species of Lithophragma (Saxifragaceae)

Friberg, Magne LU ; Schwind, Christopher; Guimarães, Paulo R.; Raguso, Robert A. and Thompson, John N. (2019) In Proceedings of the National Academy of Sciences of the United States of America 116(10). p.4406-4415
Abstract

A major challenge in evolutionary biology is to understand how complex traits of multiple functions have diversified and codiversified across interacting lineages and geographic ranges. We evaluate intra- and interspecific variation in floral scent, which is a complex trait of documented importance for mutualistic and antagonistic interactions between plants, pollinators, and herbivores. We performed a large-scale, phylogenetically structured study of an entire plant genus (Lithophragma, Saxifragaceae), of which several species are coevolving with specialized pollinating floral parasites of the moth genus Greya (Prodoxidae). We sampled 94 Lithophragma populations distributed across all 12 recognized Lithophragma species and subspecies,... (More)

A major challenge in evolutionary biology is to understand how complex traits of multiple functions have diversified and codiversified across interacting lineages and geographic ranges. We evaluate intra- and interspecific variation in floral scent, which is a complex trait of documented importance for mutualistic and antagonistic interactions between plants, pollinators, and herbivores. We performed a large-scale, phylogenetically structured study of an entire plant genus (Lithophragma, Saxifragaceae), of which several species are coevolving with specialized pollinating floral parasites of the moth genus Greya (Prodoxidae). We sampled 94 Lithophragma populations distributed across all 12 recognized Lithophragma species and subspecies, and four populations of related saxifragaceous species. Our results reveal an unusually high diversity of floral volatiles among populations, species, and clades within the genus. Moreover, we found unexpectedly major changes at each of these levels in the biosynthetic pathways used by local populations in their floral scents. Finally, we detected significant, but variable, genus- and species-level patterns of ecological convergence in the floral scent signal, including an impact of the presence and absence of two pollinating Greya moth species. We propose that one potential key to understanding floral scent variation in this hypervariable genus is its geographically diverse interactions with the obligate specialized Greya moths and, in some species and sites, more generalized copollinators.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Floral parasitism, Floral volatiles, Geographic mosaic of coevolution, Geographic variation, Pollination
in
Proceedings of the National Academy of Sciences of the United States of America
volume
116
issue
10
pages
10 pages
publisher
National Acad Sciences
external identifiers
  • scopus:85062675091
ISSN
0027-8424
DOI
10.1073/pnas.1809007116
language
English
LU publication?
yes
id
3908a792-52c0-4a32-85d2-85699721db80
date added to LUP
2019-03-19 12:18:13
date last changed
2019-10-08 03:48:12
@article{3908a792-52c0-4a32-85d2-85699721db80,
  abstract     = {<p>A major challenge in evolutionary biology is to understand how complex traits of multiple functions have diversified and codiversified across interacting lineages and geographic ranges. We evaluate intra- and interspecific variation in floral scent, which is a complex trait of documented importance for mutualistic and antagonistic interactions between plants, pollinators, and herbivores. We performed a large-scale, phylogenetically structured study of an entire plant genus (Lithophragma, Saxifragaceae), of which several species are coevolving with specialized pollinating floral parasites of the moth genus Greya (Prodoxidae). We sampled 94 Lithophragma populations distributed across all 12 recognized Lithophragma species and subspecies, and four populations of related saxifragaceous species. Our results reveal an unusually high diversity of floral volatiles among populations, species, and clades within the genus. Moreover, we found unexpectedly major changes at each of these levels in the biosynthetic pathways used by local populations in their floral scents. Finally, we detected significant, but variable, genus- and species-level patterns of ecological convergence in the floral scent signal, including an impact of the presence and absence of two pollinating Greya moth species. We propose that one potential key to understanding floral scent variation in this hypervariable genus is its geographically diverse interactions with the obligate specialized Greya moths and, in some species and sites, more generalized copollinators.</p>},
  author       = {Friberg, Magne and Schwind, Christopher and Guimarães, Paulo R. and Raguso, Robert A. and Thompson, John N.},
  issn         = {0027-8424},
  keyword      = {Floral parasitism,Floral volatiles,Geographic mosaic of coevolution,Geographic variation,Pollination},
  language     = {eng},
  number       = {10},
  pages        = {4406--4415},
  publisher    = {National Acad Sciences},
  series       = {Proceedings of the National Academy of Sciences of the United States of America},
  title        = {Extreme diversification of floral volatiles within and among species of Lithophragma (Saxifragaceae)},
  url          = {http://dx.doi.org/10.1073/pnas.1809007116},
  volume       = {116},
  year         = {2019},
}