Post-drought hydraulic recovery is accompanied by non-structural carbohydrate depletion in the stem wood of Norway spruce saplings

Scientific Reports
Martina TomasellaRainer Matyssek

Abstract

Hydraulic failure and carbon starvation are recognized as main causes of drought-induced forest decline. As water transport and carbon dynamics are strictly interdependent, it is necessary to clarify how dehydration-rehydration cycles are affecting the relations between stem embolism and non-structural carbohydrates (NSC). This is particularly needed for conifers whose embolism repair capability is still controversial. Potted Norway spruce saplings underwent two drought-re-irrigation cycles of same intensity, but performed in two consecutive summers. During the second cycle, stem percent loss of hydraulic conductivity (PLC) and NSC content showed no carry-over effects from the previous drought, indicating complete long-term recovery. The second drought treatment induced moderate PLC (20%) and did not affect total NSCs content, while starch was converted to soluble sugars in the bark. After one week of re-irrigation, PLC recovered to pre-stress values (0%) and NSCs were depleted, only in the wood, by about 30%. Our data suggest that spruce can repair xylem embolism and that, when water is newly available, NSCs stored in xylem parenchyma can be mobilized over short term to sustain respiration and/or for processes involved in xyle...Continue Reading

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Citations

Dec 28, 2019·International Journal of Molecular Sciences·Martina TomasellaValentino Casolo
Sep 24, 2019·The New Phytologist·Nate G McDowellAndrea Nardini
Oct 31, 2019·Plant Physiology and Biochemistry : PPB·Martina TomasellaAndrea Nardini
Nov 21, 2020·International Journal of Molecular Sciences·Daniel Marusig, Sergio Tombesi
Apr 7, 2021·Tree Physiology·Martina HájíčkováRoman Gebauer
Apr 28, 2021·Plant Physiology·Feng FengStefan Mayr
May 18, 2021·Frontiers in Plant Science·Lilian P Matallana-RamirezKitt G Payn

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Methods Mentioned

BETA
imaging techniques

Software Mentioned

R
R package pmCMR

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