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Heatwave frequency and seedling death alter stress-specific emissions of volatile organic compounds in Aleppo pine

Birami, Benjamin; Bamberger, Ines; Ghirardo, Andrea; Grote, Rüdiger; Arneth, Almut; Gaona-Colmán, Elizabeth; Nadal-Sala, Daniel; Ruehr, Nadine K.

Abstract:
Biogenic volatile organic compounds (BVOC) play important roles in plant stress responses and can serve as stress indicators. While the impacts of gradual environmental changes on BVOCs have been studied extensively, insights in emission responses to repeated stress and recovery are widely absent. Therefore, we studied the dynamics of shoot gas exchange and BVOC emissions in Pinus halepensis seedlings during an induced moderate drought, two four-day-long heatwaves, and the combination of drought and heatwaves. We found clear stress-specific responses of BVOC emissions. Reductions in acetone emissions with declining soil water content and transpiration stood out as a clear drought indicator. All other measured BVOC emissions responded exponentially to rising temperatures during heat stress (maximum of 43 °C), but monoterpenes and methyl salicylate showed a reduced temperature sensitivity during the second heatwave. We found that these decreases in monoterpene emissions between heatwaves were not reflected by similar declines in their internal storage pools. Because stress intensity was extremely severe, most of the seedlings in the heat-drought treatment died at the end of the second heatwave (dark respiration ceased). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000131893
Veröffentlicht am 27.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0029-8549, 1432-1939
KITopen-ID: 1000131893
Erschienen in Oecologia
Verlag Springer
Schlagwörter BVOC emissions; Drought; Heatwaves; Mortality; Stress-specific
Nachgewiesen in Scopus
Web of Science
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