Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem

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Lintunen , A , Losso , A , Aalto , J , Chan , T , Hölttä , T & Mayr , S 2020 , ' Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem ' , Tree Physiology , vol. 40 , no. 2 , pp. 170-182 . https://doi.org/10.1093/treephys/tpz123

Title: Propagating ice front induces gas bursts and ultrasonic acoustic emissions from freezing xylem
Author: Lintunen, Anna; Losso, Adriano; Aalto, Juho; Chan, Tommy; Hölttä, Teemu; Mayr, Stefan
Contributor: University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Viikki Plant Science Centre (ViPS)
Date: 2020-02
Language: eng
Number of pages: 13
Belongs to series: Tree Physiology
ISSN: 0829-318X
URI: http://hdl.handle.net/10138/323510
Abstract: Ice formation and propagation in the xylem of plants is a complex process. During freezing of xylem sap, gases dissolved in liquid sap are forced out of the ice lattice due to their low solubility in ice, and supersaturation of xylem sap as well as low water potential (Psi) are induced at the ice-liquid interface. Supersaturation of gases near the ice front may lead to bubble formation and potentially to cavitation and/or to burst of gases driven out from the branch. In this study, we investigated the origin and dynamics of freezing-related gas bursts and ultrasonic acoustic emissions (AEs), which are suggested to indicate cavitation. Picea abies (L.) H. Karst. and Salix caprea L. branch segments were exposed to frost cycles in a temperature test chamber, and CO2 efflux (indicating gas bursts) and AEs were recorded. On freezing, two-thirds of the observed gas bursts originated from the xylem and only one-third from the bark. Simultaneously with gas bursts, AEs were detected. Branch Psi affected both gas bursts and AEs, with high gas burst in saturated and dry samples but relevant AEs only in the latter. Repeated frost cycles led to decreasing gas burst volumes and AE activity. Experiments revealed that the expanding ice front in freezing xylem was responsible for observed gas bursts and AEs, and that branch Psi influenced both processes. Results also indicated that gas bursts and cavitation are independently induced by ice formation, though both may be relevant for bubble dynamics during freezing.
Subject: 11831 Plant biology
4112 Forestry
1184 Genetics, developmental biology, physiology
acoustic emissions
bark permeability
effective diffusion coefficient of CO2
freeze-thaw cycles
respiration
winter embolism
JUGLANS-REGIA
CONIFER XYLEM
WATER-STRESS
CAVITATION
EMBOLISM
WOOD
CO2
GROWTH
TREES
VULNERABILITY
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