title: Fading of wound-induced volatile release during Populus tremula leaf expansion.
abstract: The release of stress-driven volatiles throughout leaf development has been little studied. Therefore, we subjected poplar leaves during their developmental stage (from 2 days to 2 weeks old) to wounding by a single punch hole, and measured online the wound-induced volatile organic compound emissions. Our study shows that the emission of certain volatile compounds fades with increasing leaf age. Among these compounds we found lipoxygenase products (LOX products), acetaldehyde, methyl benzoate, methyl salicylate, and mono- and sesquiterpenes. In parallel, we studied the fading of constitutive emissions of methanol during leaf maturation, as well as the rise in isoprene constitutive emission during leaf maturation and its relationship to leaf photosynthetic capacity. We found highly significant relationships between leaf chlorophyll content, photosynthetic capacity, and leaf size during leaf ageing. As the level of constitutive defences increases with increasing leaf age, the strength of the volatile signal is expected to be gradually reduced. The higher elicitation of volatile organic compound emissions (especially LOX products) in younger leaves could be an evolutionary defence against herbivory, given that younger leaves are usually more subjected to infestation and herbivory.
authors.affiliation: Centre of Excellence PLECO, Department of Biology, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Belgium. Miguel.PortilloEstrada@uantwerpen.be.|Department of Plant Physiology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014, Tartu, Estonia. Miguel.PortilloEstrada@uantwerpen.be.
authors.forename: Miguel
authors.initials: M
authors.lastname: Portillo-Estrada
authors.affiliation: Department of Plant Physiology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014, Tartu, Estonia.
authors.forename: Taras
authors.initials: T
authors.lastname: Kazantsev
authors.affiliation: Department of Plant Physiology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, 51014, Tartu, Estonia.|Estonian Academy of Sciences, Kohtu 6, 10130, Tallinn, Estonia.
authors.forename: Ülo
authors.initials: Ü
authors.lastname: Niinemets
mesh_terms: D002070:Butadienes / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D045782:Hemiterpenes / Q000378:metabolism*; D060434:Herbivory; D008084:Lipoxygenase / Q000378:metabolism; D000432:Methanol / Q000378:metabolism; D010420:Pentanes / Q000378:metabolism*; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000737:chemistry / Q000502:physiology; D032107:Populus / Q000737:chemistry / Q000502:physiology*; D013997:Time Factors; D055549:Volatile Organic Compounds / Q000378:metabolism*
chemical_list: D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; D055549:Volatile Organic Compounds; C005059:isoprene; D002734:Chlorophyll; D008084:Lipoxygenase; D000432:Methanol
keywords: Isoprene; Leaf age; Lipoxygenase products; Methanol; Wounding