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Tytuł pozycji:

Visualizing Embolism Propagation in Gas-Injected Leaves.

Tytuł:
Visualizing Embolism Propagation in Gas-Injected Leaves.
Autorzy:
Hochberg U; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138 .; ARO Volcani Center, Institute of Soil, Water and Environmental Sciences, Bet Dagan, 7505101 Israel.
Ponomarenko A; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.
Zhang YJ; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.; School of Biology and Ecology, University of Maine, Orono, Maine 04469.
Rockwell FE; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.
Holbrook NM; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.
Źródło:
Plant physiology [Plant Physiol] 2019 Jun; Vol. 180 (2), pp. 874-881. Date of Electronic Publication: 2019 Mar 06.
Typ publikacji:
Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
Język:
English
Imprint Name(s):
Publication: : [Rockville, MD] : American Society of Plant Biologists
Original Publication: Lancaster, Pa., American Society of Plant Physiologists.
MeSH Terms:
Gases/*metabolism
Plant Leaves/*physiology
Xylem/*physiology
Image Processing, Computer-Assisted ; Pressure ; Quercus/physiology ; Vitis/physiology ; Water
References:
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Substance Nomenclature:
0 (Gases)
059QF0KO0R (Water)
Entry Date(s):
Date Created: 20190308 Date Completed: 20200824 Latest Revision: 20200824
Update Code:
20240105
PubMed Central ID:
PMC6548249
DOI:
10.1104/pp.18.01284
PMID:
30842264
Czasopismo naukowe
Because the xylem in leaves is thought to be at the greatest risk of cavitation, reliable and efficient methods to characterize leaf xylem vulnerability are of interest. We report a method to generate leaf xylem vulnerability curves (VCs) by gas injection. Using optical light transmission, we visualized embolism propagation in grapevine ( Vitis vinifera ) and red oak ( Quercus rubra ) leaves injected with positive gas pressure. This resulted in a rapid, stepwise reduction of transmitted light, identical to that observed during leaf dehydration, confirming that the optical method detects gas bubbles and provides insights into the air-seeding hypothesis. In red oak, xylem VCs generated using gas injection were similar to those generated using bench dehydration, but indicated 50% loss of conductivity at lower tension (∼0.4 MPa) in grapevine. In determining VC, this method eliminates the need to ascertain xylem tension, thus avoiding potential errors in water potential estimations. It is also much faster (1 h per VC). However, severing the petiole and applying high-pressure gas could affect air-seeding and the generated VC. We discuss potential artifacts arising from gas injection and recommend comparison of this method with a more standard procedure before it is assumed to be suitable for a given species.
(© 2019 American Society of Plant Biologists. All Rights Reserved.)
Comment in: Plant Physiol. 2019 Jun;180(2):706-707. (PMID: 31160528)

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