| Title: | Extreme diversification of floral volatiles within and among species of Lithophragma (Saxifragaceae) |
| Author(s): | Friberg M; Schwind C; Guimaraes PR; Raguso RA; Thompson JN; |
| Address: | "Department of Biology, Lund University, SE-223 62 Lund, Sweden; magne.friberg@biol.lu.se. Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA 95060. Departamento de Ecologia, Instituto de Biociencias, Universidade de Sao Paulo, 05508-090 Sao Paulo, Brazil. Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853" |
| ISSN/ISBN: | 1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking) |
| 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, 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" |
| Keywords: | Flowers/*metabolism Phylogeography Saxifragaceae/classification/*metabolism Species Specificity Volatile Organic Compounds/*metabolism floral parasitism floral volatiles geographic mosaic of coevolution geographic variation pollination; |
| Notes: | "MedlineFriberg, Magne Schwind, Christopher Guimaraes, Paulo R Jr Raguso, Robert A Thompson, John N eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2019/02/16 Proc Natl Acad Sci U S A. 2019 Mar 5; 116(10):4406-4415. doi: 10.1073/pnas.1809007116. Epub 2019 Feb 14" |
