Research article - Peer-reviewed, 2014
No Evidence of Geographical Structure of Salicinoid Chemotypes within Populus Tremula
Keefover-Ring, Ken; Ahnlund, Maria; Abreu, Ilka; Jansson, Stefan; Moritz, Thomas; Albrectsen, Benedicte RiberAbstract
Salicinoids are well-known defense compounds in salicaceous trees and careful screening at the population level is warranted to fully understand their diversity and function. European aspen, Populus tremula, is a foundation species in Eurasia and highly polymorphic in Sweden. We exhaustively surveyed 102 replicated genotypes from the Swedish Aspen collection (SwAsp) for foliar salicinoids using UHPLC-ESI-TOF/MS and identified nine novel compounds, bringing the total to 19 for this species. Salicinoid structure followed a modular architecture of a salicin skeleton with added side groups, alone or in combination. Two main moieties, 2'-cinnamoyl and 2'-acetyl, grouped the SwAsp population into four distinct chemotypes, and the relative allocation of salicinoids was remarkably constant between different environments, implying a highly channeled biosynthesis of these compounds. Slightly more than half of the SwAsp genotypes belonged to the cinnamoyl chemotype. A fraction synthesized the acetyl moiety alone (similar to 7%) or in combination with cinnamoyl (similar to 2%), and close to forty percent lacked either of the two characteristic moieties, and thus resemble P. tremuloides in their salicinoid profile. The two most abundant chemotypes were evenly distributed throughout Sweden, unlike geographical patterns reported for SwAsp phenology traits, plant defense genes, and herbivore community associations. Here we present the salicinoid characterization of the SwAsp collection as a resource for future studies of aspen chemical ecology, salicinoid biosynthesis, and genetics.Published in
PLoS ONE2014, volume: 9, number: 10, article number: e107189
Publisher: PUBLIC LIBRARY SCIENCE
Authors' information
Keefover-Ring, Ken
University of Wisconsin-Madison
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Abreu, Ilka
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Abreu, Ilka
Umeå University
Jansson, Stefan
Umeå University
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Albrectsen, Benedicte Riber
University of Copenhagen
Associated SLU-program
SLU Network Plant Protection
UKÄ Subject classification
Ecology
Botany
Publication Identifiers
DOI: https://doi.org/10.1371/journal.pone.0107189
URI (permanent link to this page)
https://res.slu.se/id/publ/67395