Bark wounding triggers gradual embolism spreading in two
diffuse-porous tree species

JUPA, Radek and Kamila POKORNÁ. Bark wounding triggers gradual embolism spreading in two diffuse-porous tree species. Tree Physiology. Oxford: Oxford University Press, 2024, vol. 44, No 1, p. 1-12. ISSN 0829-318X. Available from: https://dx.doi.org/10.1093/treephys/tpad132.

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TY  - JOUR
ID  - 2385610
AU  - Jupa, Radek - Pokorná, Kamila
PY  - 2024
TI  - Bark wounding triggers gradual embolism spreading in two diffuse-porous tree species
JF  - Tree Physiology
VL  - 44
IS  - 1
SP  - 1-12
EP  - 1-12
PB  - Oxford University Press
SN  - 0829318X
KW  - drought
KW  - gas exchange
KW  - hydraulic conductivity
KW  - tree injury
KW  - water potential
KW  - xylem
UR  - https://academic.oup.com/treephys/article/44/1/tpad132/7334553
N2  - Xylem transport is essential for the growth, development and survival of vascular plants. Bark wounding may increase the risk of xylem transport failure by tension-driven embolism. However, the consequences of bark wounding for xylem transport are poorly understood. Here, we examined the impacts of the bark wounding on embolism formation, leaf water potential and gas exchange in the terminal branches of two diffuse-porous tree species (Acer platanoides L. and Prunus avium L.). The effects of bark removal were examined on field-grown mature trees exposed to increased evaporative demands on a short-term and longer-term basis (6 h vs 6 days after bark wounding). Bark removal of 30% of branch circumference had a limited effect on the xylem hydraulic conductivity when embolized vessels were typically restricted to the last annual ring near the bark wound. Over the 6-day exposure, the non-conductive xylem area had significantly increased in the xylem tissue underneath the bark wound (from 22-29% to 51-52% of the last annual ring area in the bark wound zone), pointing to gradual yet relatively limited embolism spreading to deeper xylem layers over time. In both species, the bark removal tended to result in a small but non-significant increase in the percent loss of hydraulic conductivity compared with control intact branches 6 days after bark wounding (from 6 to 8-10% in both species). The bark wounding had no significant effects on midday leaf water potential, CO2 assimilation rates, stomatal conductance and water-use efficiency of the leaves of the current-year shoot, possibly due to limited impacts on xylem transport. The results of this study demonstrate that bark wounding induces limited but gradual embolism spreading. However, the impacts of bark wounding may not significantly limit water delivery to distal organs and leaf gas exchange at the scale of several days.
ER  -

Basic information
Original name	Bark wounding triggers gradual embolism spreading in two diffuse-porous tree species
Authors	JUPA, Radek (203 Czech Republic, guarantor, belonging to the institution) and Kamila POKORNÁ (203 Czech Republic, belonging to the institution).
Edition	Tree Physiology, Oxford, Oxford University Press, 2024, 0829-318X.

Other information
Original language	English
Type of outcome	Article in a journal
Field of Study	10611 Plant sciences, botany
Country of publisher	United Kingdom of Great Britain and Northern Ireland
Confidentiality degree	is not subject to a state or trade secret
WWW	URL
Impact factor	Impact factor: 4.000 in 2022
Organization unit	Faculty of Science
Doi	http://dx.doi.org/10.1093/treephys/tpad132
UT WoS	001112496400001
Keywords in English	drought; gas exchange; hydraulic conductivity; tree injury; water potential; xylem
Tags	rivok
Tags	International impact, Reviewed
Changed by	Changed by: Mgr. Marie Šípková, DiS., učo 437722. Changed: 18/3/2024 17:00.

Abstract

Xylem transport is essential for the growth, development and survival of vascular plants. Bark wounding may increase the risk of xylem transport failure by tension-driven embolism. However, the consequences of bark wounding for xylem transport are poorly understood. Here, we examined the impacts of the bark wounding on embolism formation, leaf water potential and gas exchange in the terminal branches of two diffuse-porous tree species (Acer platanoides L. and Prunus avium L.). The effects of bark removal were examined on field-grown mature trees exposed to increased evaporative demands on a short-term and longer-term basis (6 h vs 6 days after bark wounding). Bark removal of 30% of branch circumference had a limited effect on the xylem hydraulic conductivity when embolized vessels were typically restricted to the last annual ring near the bark wound. Over the 6-day exposure, the non-conductive xylem area had significantly increased in the xylem tissue underneath the bark wound (from 22-29% to 51-52% of the last annual ring area in the bark wound zone), pointing to gradual yet relatively limited embolism spreading to deeper xylem layers over time. In both species, the bark removal tended to result in a small but non-significant increase in the percent loss of hydraulic conductivity compared with control intact branches 6 days after bark wounding (from 6 to 8-10% in both species). The bark wounding had no significant effects on midday leaf water potential, CO2 assimilation rates, stomatal conductance and water-use efficiency of the leaves of the current-year shoot, possibly due to limited impacts on xylem transport. The results of this study demonstrate that bark wounding induces limited but gradual embolism spreading. However, the impacts of bark wounding may not significantly limit water delivery to distal organs and leaf gas exchange at the scale of several days.

PrintDisplayed: 8/7/2024 08:46

Bark wounding triggers gradual embolism spreading in two diffuse-porous tree species

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