Cargando…

In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution

Xylem embolism impairs hydraulic conductivity in trees and drives drought‐induced mortality. While embolism has been monitored in vivo in potted plants, and research has revealed evidence of embolism in field‐grown trees, continuous in situ monitoring of cavitation in forests is lacking. Seasonal pa...

Descripción completa

Detalles Bibliográficos
Autores principales: Wagner, Yael, Feng, Feng, Yakir, Dan, Klein, Tamir, Hochberg, Uri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9541785/
https://www.ncbi.nlm.nih.gov/pubmed/35514143
http://dx.doi.org/10.1111/nph.18208
_version_ 1784804001473101824
author Wagner, Yael
Feng, Feng
Yakir, Dan
Klein, Tamir
Hochberg, Uri
author_facet Wagner, Yael
Feng, Feng
Yakir, Dan
Klein, Tamir
Hochberg, Uri
author_sort Wagner, Yael
collection PubMed
description Xylem embolism impairs hydraulic conductivity in trees and drives drought‐induced mortality. While embolism has been monitored in vivo in potted plants, and research has revealed evidence of embolism in field‐grown trees, continuous in situ monitoring of cavitation in forests is lacking. Seasonal patterns of embolism were monitored in branchlets of Aleppo pine (Pinus halepensis) trees growing in a dry Mediterranean forest. Optical visualization (OV) sensors were installed on terminal branches, in addition to monthly sampling for micro computed tomography scans. We detected 208 cavitation events among four trees, which represented an embolism increase from zero to c. 12% along the dry season. Virtually all the cavitation events occurred during daytime hours, with 77% occurring between 10:00 and 17:00 h. The probability for cavitation in a given hour increased as vapor pressure deficit (VPD) increased, up to a probability of 42% for cavitation when VPD > 5 kPa. The findings uniquely reveal the instantaneous environmental conditions that lead to cavitation. The increased likelihood of cavitation events under high VPD in water‐stressed pines is the first empirical support for this long hypothesized relationship. Our observations suggest that low levels of embolism are common in Aleppo pine trees at the dry edge of their distribution.
format Online
Article
Text
id pubmed-9541785
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-95417852022-10-14 In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution Wagner, Yael Feng, Feng Yakir, Dan Klein, Tamir Hochberg, Uri New Phytol Research Xylem embolism impairs hydraulic conductivity in trees and drives drought‐induced mortality. While embolism has been monitored in vivo in potted plants, and research has revealed evidence of embolism in field‐grown trees, continuous in situ monitoring of cavitation in forests is lacking. Seasonal patterns of embolism were monitored in branchlets of Aleppo pine (Pinus halepensis) trees growing in a dry Mediterranean forest. Optical visualization (OV) sensors were installed on terminal branches, in addition to monthly sampling for micro computed tomography scans. We detected 208 cavitation events among four trees, which represented an embolism increase from zero to c. 12% along the dry season. Virtually all the cavitation events occurred during daytime hours, with 77% occurring between 10:00 and 17:00 h. The probability for cavitation in a given hour increased as vapor pressure deficit (VPD) increased, up to a probability of 42% for cavitation when VPD > 5 kPa. The findings uniquely reveal the instantaneous environmental conditions that lead to cavitation. The increased likelihood of cavitation events under high VPD in water‐stressed pines is the first empirical support for this long hypothesized relationship. Our observations suggest that low levels of embolism are common in Aleppo pine trees at the dry edge of their distribution. John Wiley and Sons Inc. 2022-06-01 2022-08 /pmc/articles/PMC9541785/ /pubmed/35514143 http://dx.doi.org/10.1111/nph.18208 Text en © 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Wagner, Yael
Feng, Feng
Yakir, Dan
Klein, Tamir
Hochberg, Uri
In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title_full In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title_fullStr In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title_full_unstemmed In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title_short In situ, direct observation of seasonal embolism dynamics in Aleppo pine trees growing on the dry edge of their distribution
title_sort in situ, direct observation of seasonal embolism dynamics in aleppo pine trees growing on the dry edge of their distribution
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9541785/
https://www.ncbi.nlm.nih.gov/pubmed/35514143
http://dx.doi.org/10.1111/nph.18208
work_keys_str_mv AT wagneryael insitudirectobservationofseasonalembolismdynamicsinaleppopinetreesgrowingonthedryedgeoftheirdistribution
AT fengfeng insitudirectobservationofseasonalembolismdynamicsinaleppopinetreesgrowingonthedryedgeoftheirdistribution
AT yakirdan insitudirectobservationofseasonalembolismdynamicsinaleppopinetreesgrowingonthedryedgeoftheirdistribution
AT kleintamir insitudirectobservationofseasonalembolismdynamicsinaleppopinetreesgrowingonthedryedgeoftheirdistribution
AT hochberguri insitudirectobservationofseasonalembolismdynamicsinaleppopinetreesgrowingonthedryedgeoftheirdistribution