Detection of acoustic events in lavender for measuring xylem vulnerability to embolism and cellular damage
Résumé
Abstract Acoustic emission analysis is promising to investigate the physiological events leading to drought-induced injury and mortality. However, their nature and source are not fully understood, making this technique difficult to use as a direct measure of the loss of xylem hydraulic conductance. Acoustic emissions were recorded during severe dehydration in lavender plants (Lavandula angustifolia) and compared with the dynamics of embolism development and cell damage. The timing and characteristics of acoustic signals from two independent recording systems were compared by principal component analysis (PCA). Changes in water potential, branch diameter, loss of hydraulic conductance, and cellular damage were also measured to quantify drought-induced damages. Two distinct phases of acoustic emissions were observed during dehydration: the first one associated with a rapid loss of diameter and a significant increase in loss of xylem conductance (90%), and the second with slower changes in diameter and a significant increase in cellular damage. Based on PCA, a developed algorithm discriminated hydraulic-related acoustic signals from other sources, proposing a reconstruction of hydraulic vulnerability curves. Cellular damage preceded by hydraulic failure seems to lead to a lack of recovery. The second acoustic phase would allow detection of plant mortality.
Mots clés
Acoustics
cavitation
cellular damages
dendrometer
hydraulic failure
lavender
plant mortality
xylem
AE
acoustic emission
Dim
dimension
I Dam
index of damage
LV
latent variable
PCA
principal component analysis
PLC
percentage loss of hydraulic conductance
PLD
percentage loss of diameter
PLRC
percentage loss of rehydration capacity Acoustics
Domaines
Biologie végétaleOrigine | Publication financée par une institution |
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