Gradients and dynamics of inner bark and needle osmotic potentials in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies L. Karst)

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Paljakka , T , Jyske , T , Lintunen , A , Aaltonen , H , Nikinmaa , E & Hölttä , T 2017 , ' Gradients and dynamics of inner bark and needle osmotic potentials in Scots pine ( Pinus sylvestris L.) and Norway spruce ( Picea abies L. Karst) ' , Plant, Cell and Environment , vol. 40 , no. 10 , pp. 2160-2173 . https://doi.org/10.1111/pce.13017

Title: Gradients and dynamics of inner bark and needle osmotic potentials in Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies L. Karst)
Author: Paljakka, Teemu; Jyske, Tuula; Lintunen, Anna; Aaltonen, Heidi; Nikinmaa, Eero; Hölttä, Teemu
Contributor organization: Department of Forest Sciences
Ecosystem processes (INAR Forest Sciences)
Forest Ecology and Management
Forest Soil Science and Biogeochemistry
Date: 2017-10
Language: eng
Number of pages: 14
Belongs to series: Plant, Cell and Environment
ISSN: 0140-7791
DOI: https://doi.org/10.1111/pce.13017
URI: http://hdl.handle.net/10138/312013
Abstract: Preconditions of phloem transport in conifers are relatively unknown. We studied the variation of needle and inner bark axial osmotic gradients and xylem water potential in Scots pine and Norway spruce by measuring needle and inner bark osmolality in saplings and mature trees over several periods within a growing season. The needle and inner bark osmolality was strongly related to xylem water potential in all studied trees. Sugar concentrations were measured in Scots pine, and they had similar dynamics to inner bark osmolality. The sucrose quantity remained fairly constant over time and position, whereas the other sugars exhibited a larger change with time and position. A small osmotic gradient existed from branch to stem base under pre-dawn conditions, and the osmotic gradient between upper stem and stem base was close to zero. The turgor in branches was significantly driven by xylem water potential, and the turgor loss point in branches was relatively close to daily minimum needle water potentials typically reported for Scots pine. Our results imply that xylem water potential considerably impacts the turgor pressure gradient driving phloem transport and that gravitation has a relatively large role in phloem transport in the stems of mature Scots pine trees.
Subject: conifer
osmolality
phloem transport
turgor pressure
xylem water potential
STEM DIAMETER VARIATIONS
PHLOEM LOADING STRATEGIES
TREE WATER RELATIONS
LEAF GAS-EXCHANGE
TURGOR PRESSURE
HYDRAULIC CONDUCTANCE
HYDROSTATIC-PRESSURE
CARBON TRANSPORT
MUNCH HYPOTHESIS
STOMATAL CONTROL
4112 Forestry
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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