Shade-induced reduction of stem nonstructural carbohydrates increases xylem vulnerability to embolism and impedes hydraulic recovery in Populus nigra.

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Tytuł:: Shade-induced reduction of stem nonstructural carbohydrates increases xylem vulnerability to embolism and impedes hydraulic recovery in Populus nigra.
Autorzy:: Tomasella M; Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, Trieste, 34127, Italy.
Casolo V; Dipartimento di Scienze Agroalimentari, Ambientali e Animali, Università di Udine, Via delle Scienze 91, Udine, 33100, Italy.
Natale S; Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, Trieste, 34127, Italy.
Petruzzellis F; Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, Trieste, 34127, Italy.
Kofler W; Department of Botany, University of Innsbruck, Sternwartestraße 15, Innsbruck, 6020, Austria.
Beikircher B; Department of Botany, University of Innsbruck, Sternwartestraße 15, Innsbruck, 6020, Austria.
Mayr S; Department of Botany, University of Innsbruck, Sternwartestraße 15, Innsbruck, 6020, Austria.
Nardini A; Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, Trieste, 34127, Italy.
Źródło:: The New phytologist [New Phytol] 2021 Jul; Vol. 231 (1), pp. 108-121. Date of Electronic Publication: 2021 May 15.
Typ publikacji:: Journal Article; Research Support, Non-U.S. Gov't
Język:: English
Imprint Name(s):: Publication: Oxford : Wiley on behalf of New Phytologist Trust
Original Publication: London, New York [etc.] Academic Press.
MeSH Terms:: Embolism*
Populus*
Carbohydrates ; Droughts ; Water ; X-Ray Microtomography ; Xylem
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Contributed Indexing:: Keywords: black poplar; carbon starvation; hydraulic recovery; nonstructural carbohydrate (NSC); shading; xylem anatomy; xylem sap pH; xylem vulnerability
Substance Nomenclature:: 0 (Carbohydrates)
059QF0KO0R (Water)
Entry Date(s):: Date Created: 20210403 Date Completed: 20210610 Latest Revision: 20220731
Update Code:: 20240105
PubMed Central ID:: PMC9290559
DOI:: 10.1111/nph.17384
PMID:: 33811346
: Czasopismo naukowe

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Nonstructural carbohydrates (NSCs) have been suggested to affect xylem transport under fluctuating water availability, but conclusive evidence is still lacking. We tested the effect of shade-induced NSC depletion on xylem vulnerability to embolism and hydraulic recovery on Populus nigra saplings. Vulnerability was assessed in light-exposed (L) and shaded (S) plants with the hydraulic method, and in vivo with the optical method and X-ray micro-computed tomography. Plants were stressed to 80% loss of hydraulic conductance (PLC) and re-irrigated to check for possible recovery. We measured PLC, bark and wood NSC content, as well as xylem sap pH, surface tension (γ sap ) and sugar concentration, before, during and after drought. Shading induced depletion of stem NSC (mainly starch) reserves. All methods converged in indicating higher xylem vulnerability in S than in L plants. This difference was not explained by xylem vessel and pit anatomy or by γ sap . Shading impeded sap acidification and sugar accumulation during drought in S plants and prevented hydraulic recovery, which was observed in L plants. Our results highlight the importance of stem NSCs to sustain xylem hydraulic functioning during drought and suggest that light and/or adequate stem NSC thresholds are required to trigger xylem sap chemical changes involved in embolism recovery.
(© 2021 The Authors New Phytologist © 2021 New Phytologist Foundation.)

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