2019
DOI: 10.1111/pce.13578
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Corticular photosynthesis drives bark water uptake to refill embolized vessels in dehydrated branches of Salix matsudana

Abstract: It is well known that xylem embolism can be repaired by bark water uptake and that the sugar required for embolism refilling can be provided by corticular photosynthesis. However, the relationship between corticular photosynthesis and embolism repair by bark water uptake is still poorly understood. In this study, the role of corticular photosynthesis in embolism repair was assessed using Salix matsudana branch segments dehydrated to −1.9 MPa (P 50 , water potential at 50% loss of conductivity).The results indi… Show more

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Cited by 39 publications
(65 citation statements)
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“…Hydraulic recovery may occur to a less extent or not occur at all, in dependence on the species and magnitude of drought stress and hydraulic damage. For example, the magnitude of hydraulic recovery in Salix matsudana branches soaked for 6 hours was lower in samples dehydrated to Ψ x of −2.2 MPa than in those reaching −1.5 MPa and −1.9 MPa [101]. In a similar way, stems of Fagus sylvatica saplings reaching PLCs close to thresholds for hydraulic failure (85%) did not recover hydraulic function in the short term [18].…”
Section: Stem Nscs and The Post-drought Recovery Of Xylem Functionmentioning
confidence: 88%
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“…Hydraulic recovery may occur to a less extent or not occur at all, in dependence on the species and magnitude of drought stress and hydraulic damage. For example, the magnitude of hydraulic recovery in Salix matsudana branches soaked for 6 hours was lower in samples dehydrated to Ψ x of −2.2 MPa than in those reaching −1.5 MPa and −1.9 MPa [101]. In a similar way, stems of Fagus sylvatica saplings reaching PLCs close to thresholds for hydraulic failure (85%) did not recover hydraulic function in the short term [18].…”
Section: Stem Nscs and The Post-drought Recovery Of Xylem Functionmentioning
confidence: 88%
“…Given its connectivity with xylem tissue, phloem has been also suggested to be involved in the refilling process [41,65,98,99]. In accordance, phloem inactivation via partial or full girdling prevented starch hydrolysis in parenchyma rays [100] and reduced or inhibited refilling [42,67,[100][101][102][103]. Xylary chloroplasts, locally furnishing sugars, are also thought to play a role in the refilling process [58,59,101].…”
Section: Stem Nscs and The Post-drought Recovery Of Xylem Functionmentioning
confidence: 96%
“…For instance, De Baerdemaeker, Salomón, De Roo, and Steppe () demonstrated that branches wrapped in aluminium foil, and thus unable to perform P wt , were more vulnerable to drought‐induced embolism. Enhanced xylem hydraulic performance via P wt might be partially explained by promoted bark water uptake and nonstructural carbohydrate accumulation favouring vessel refilling, as observed in branches of Salix matsudana (Liu et al, ). Furthermore, P wt is less sensitive to drought than leaf photosynthesis (Ávila et al, ; Bloemen, McGuire, Aubrey, Teskey, & Steppe, ; Cernusak & Cheesman, ; Teskey et al, ).…”
Section: Introductionmentioning
confidence: 96%
“…Similar results were obtained by Bloemen, Vergeynst, Overlaet‐Michiels, and Steppe () in young P. deltoides x nigra trees showing a 30% reduction in stem growth of light‐excluded trees. Besides contributing to stem growth, locally assimilated carbohydrates can also be used in protection against insects (Zvereva & Kozlov, ), to maintain plant hydraulic integrity and increase xylem resistance to hydraulic failure (Bloemen et al, ; Sevanto, Mcdowell, Dickman, Pangle, & Pockman, ) and to refill xylem vessels after embolism (Liu et al, ; Schmitz, Egerton, Lovelock, & Ball, ; Secchi & Zwieniecki, ; Zwieniecki & Holbrook, ). For instance, De Baerdemaeker, Salomón, De Roo, and Steppe () demonstrated that branches wrapped in aluminium foil, and thus unable to perform P wt , were more vulnerable to drought‐induced embolism.…”
Section: Introductionmentioning
confidence: 99%
“…An open‐minded analysis of available evidence suggests that post‐drought embolism refilling under substantial residual tension is probably not common in plants, and at least problematic from a thermodynamic point of view (Vesala et al ., ). Rather, the actual question is whether active and fast hydraulic recovery is possible when plant water potential rises close to zero, via biological processes generating local positive xylem pressures using residual stores of non‐structural carbohydrates (Savi et al ., ; Liu et al ., ). Answering this question without triggering new controversies will probably require at least two new methodological advances.…”
Section: Advance: Recovery From Xylem Embolismmentioning
confidence: 97%