PoplarV1, Main, Exploration, bibRecord, 002C04

Analysis of xylem sap from functional (nonembolized) and nonfunctional (embolized) vessels of Populus nigra: chemistry of refilling.

Identifieur interne : 002C04 ( Main/Exploration ); précédent : 002C03; suivant : 002C05

Analysis of xylem sap from functional (nonembolized) and nonfunctional (embolized) vessels of Populus nigra: chemistry of refilling.

Auteurs : Francesca Secchi [États-Unis] ; Maciej A. Zwieniecki

Source :

Plant physiology [ 1532-2548 ] ; 2012.

RBID : pubmed:22837359

Descripteurs français

KwdFr :
- Concentration en ions d'hydrogène (MeSH), Déshydratation (MeSH), Eau (composition chimique), Exsudats végétaux (composition chimique), Feuilles de plante (composition chimique), Feuilles de plante (physiologie), Osmose (MeSH), Phénomènes électrophysiologiques (MeSH), Populus (composition chimique), Populus (physiologie), Stress physiologique (MeSH), Tiges de plante (composition chimique), Tiges de plante (physiologie), Transport biologique (MeSH), Xylème (composition chimique), Xylème (physiologie).
MESH :
- composition chimique : Eau, Exsudats végétaux, Feuilles de plante, Populus, Tiges de plante, Xylème.
- physiologie : Feuilles de plante, Populus, Tiges de plante, Xylème.
- Concentration en ions d'hydrogène, Déshydratation, Osmose, Phénomènes électrophysiologiques, Stress physiologique, Transport biologique.

English descriptors

KwdEn :
- Biological Transport (MeSH), Dehydration (MeSH), Electrophysiological Phenomena (MeSH), Hydrogen-Ion Concentration (MeSH), Osmosis (MeSH), Plant Exudates (chemistry), Plant Leaves (chemistry), Plant Leaves (physiology), Plant Stems (chemistry), Plant Stems (physiology), Populus (chemistry), Populus (physiology), Stress, Physiological (MeSH), Water (chemistry), Xylem (chemistry), Xylem (physiology).
MESH :
- chemical , chemistry : Plant Exudates, Water.
- chemistry : Plant Leaves, Plant Stems, Populus, Xylem.
- physiology : Plant Leaves, Plant Stems, Populus, Xylem.
- Biological Transport, Dehydration, Electrophysiological Phenomena, Hydrogen-Ion Concentration, Osmosis, Stress, Physiological.

Abstract

It is assumed that the refilling of drought-induced embolism requires the creation of an osmotic gradient between xylem parenchyma cells and vessel lumens to generate the water efflux needed to fill the void. To assess the mechanism of embolism repair, it is crucial to determine if plants can up-regulate the efflux of osmotically active substances into embolized vessels and identify the major components of the released osmoticum. Here, we introduce a new approach of sap collection designed to separate water from nonembolized (functional) and embolized (nonfunctional) vessels. This new approach made possible the chemical analysis of liquid collected from both types of vessels in plants subjected to different levels of water stress. The technique also allowed us to determine the water volumes in nonfunctional vessels as a function of stress level. Overall, with the increase of water stress in plants, the osmotic potential of liquid collected from nonfunctional vessels increased while its volume decreased. These results revealed the presence of both sugars and ions in nonfunctional vessels at elevated levels in comparison with liquid collected from functional vessels, in which only traces of sugars were found. The increased sugar concentration was accompanied by decreased xylem sap pH. These results provide new insight into the biology of refilling, underlining the role of sugar and sugar transporters, and imply that a large degree of hydraulic compartmentalization must exist in the xylem during the refilling process.

DOI: 10.1104/pp.112.200824
PubMed: 22837359
PubMed Central: PMC3461568

Affiliations:

États-Unis

Links toward previous steps (curation, corpus...)

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Le document en format XML

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<term>Dehydration (MeSH)</term>
<term>Electrophysiological Phenomena (MeSH)</term>
<term>Hydrogen-Ion Concentration (MeSH)</term>
<term>Osmosis (MeSH)</term>
<term>Plant Exudates (chemistry)</term>
<term>Plant Leaves (chemistry)</term>
<term>Plant Leaves (physiology)</term>
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<term>Plant Stems (physiology)</term>
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<term>Xylem (chemistry)</term>
<term>Xylem (physiology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Concentration en ions d'hydrogène (MeSH)</term>
<term>Déshydratation (MeSH)</term>
<term>Eau (composition chimique)</term>
<term>Exsudats végétaux (composition chimique)</term>
<term>Feuilles de plante (composition chimique)</term>
<term>Feuilles de plante (physiologie)</term>
<term>Osmose (MeSH)</term>
<term>Phénomènes électrophysiologiques (MeSH)</term>
<term>Populus (composition chimique)</term>
<term>Populus (physiologie)</term>
<term>Stress physiologique (MeSH)</term>
<term>Tiges de plante (composition chimique)</term>
<term>Tiges de plante (physiologie)</term>
<term>Transport biologique (MeSH)</term>
<term>Xylème (composition chimique)</term>
<term>Xylème (physiologie)</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Plant Exudates</term>
<term>Water</term>
</keywords>
<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Plant Leaves</term>
<term>Plant Stems</term>
<term>Populus</term>
<term>Xylem</term>
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<keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr"><term>Eau</term>
<term>Exsudats végétaux</term>
<term>Feuilles de plante</term>
<term>Populus</term>
<term>Tiges de plante</term>
<term>Xylème</term>
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<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Feuilles de plante</term>
<term>Populus</term>
<term>Tiges de plante</term>
<term>Xylème</term>
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<term>Plant Stems</term>
<term>Populus</term>
<term>Xylem</term>
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<term>Déshydratation</term>
<term>Osmose</term>
<term>Phénomènes électrophysiologiques</term>
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<front><div type="abstract" xml:lang="en">It is assumed that the refilling of drought-induced embolism requires the creation of an osmotic gradient between xylem parenchyma cells and vessel lumens to generate the water efflux needed to fill the void. To assess the mechanism of embolism repair, it is crucial to determine if plants can up-regulate the efflux of osmotically active substances into embolized vessels and identify the major components of the released osmoticum. Here, we introduce a new approach of sap collection designed to separate water from nonembolized (functional) and embolized (nonfunctional) vessels. This new approach made possible the chemical analysis of liquid collected from both types of vessels in plants subjected to different levels of water stress. The technique also allowed us to determine the water volumes in nonfunctional vessels as a function of stress level. Overall, with the increase of water stress in plants, the osmotic potential of liquid collected from nonfunctional vessels increased while its volume decreased. These results revealed the presence of both sugars and ions in nonfunctional vessels at elevated levels in comparison with liquid collected from functional vessels, in which only traces of sugars were found. The increased sugar concentration was accompanied by decreased xylem sap pH. These results provide new insight into the biology of refilling, underlining the role of sugar and sugar transporters, and imply that a large degree of hydraulic compartmentalization must exist in the xylem during the refilling process.</div>
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Analysis of xylem sap from functional (nonembolized) and nonfunctional (embolized) vessels of Populus nigra: chemistry of refilling.

Analysis of xylem sap from functional (nonembolized) and nonfunctional (embolized) vessels of Populus nigra: chemistry of refilling.

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