Birch leaves and branches as a source of ice-nucleating macromolecules

dc.contributor.authorFelgitsch, Lauraen
dc.contributor.authorBaloh, Philippen
dc.contributor.authorBurkart, Juliaen
dc.contributor.authorMayr, Maximilianen
dc.contributor.authorMomken, Mohammad E.en
dc.contributor.authorSeifried, Teresa M.en
dc.contributor.authorWinkler, Philipp L.en
dc.contributor.authorSchmale, David G. IIIen
dc.contributor.authorGrothe, Hinrichen
dc.contributor.departmentSchool of Plant and Environmental Sciencesen
dc.date.accessioned2019-06-11T15:30:00Zen
dc.date.available2019-06-11T15:30:00Zen
dc.date.issued2018-11-08en
dc.description.abstractBirch pollen are known to release ice-nucleating macromolecules (INM), but little is known about the production and release of INM from other parts of the tree. We examined the ice nucleation activity of samples from 10 different birch trees (Betula spp.). Samples were taken from nine birch trees in Tyrol, Austria, and from one tree in a small urban park in Vienna, Austria. Filtered aqueous extracts of 30 samples of leaves, primary wood (new branch wood, green in colour, photosynthetically active), and secondary wood (older branch wood, brown in colour, with no photosynthetic activity) were analysed in terms of ice nucleation activity using VODCA (Vienna Optical Droplet Crystallization Analyser), a cryo microscope for emulsion samples. All samples contained ice-nucleating particles in the submicron size range. Concentrations of ice nuclei ranged from 6:7 x 10⁴ to 6:1 x 10⁹ mg⁻¹ sample. Mean freezing temperatures varied between -15:6 and -31:3 °C; the range of temperatures where washes of birch pollen and dilutions thereof typically freeze. The freezing behaviour of three concentrations of birch pollen washing water (initial wash, 1 : 100, and 1 : 10 000) were significantly associated with more than a quarter of our samples, including some of the samples with highest and lowest activity. This indicates a relationship between the INM of wood, leaves, and pollen. Extracts derived from secondary wood showed the highest concentrations of INM and the highest freezing temperatures. Extracts from the leaves exhibited the highest variation in INM and freezing temperatures. Infrared spectra of the extracts and tested birch samples show qualitative similarity, suggesting the chemical components may be broadly similar.en
dc.description.sponsorshipThe authors would like to thank the FWF (Austrian Science Fund, project no. P 26040) and the FFG (Austrian Research Promotion Agency, project no. 850689) for funding.en
dc.format.extent17 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.5194/acp-18-16063-2018en
dc.identifier.urihttp://hdl.handle.net/10919/89926en
dc.identifier.volume18en
dc.language.isoenen
dc.publisherEuropean Geosciences Unionen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleBirch leaves and branches as a source of ice-nucleating macromoleculesen
dc.title.serialAtmospheric Chemistry and Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
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