Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings.
Identifieur interne : 004891 ( Main/Curation ); précédent : 004890; suivant : 004892Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings.
Auteurs : Wan [Canada] ; ZwiazekSource :
- Plant physiology [ 1532-2548 ] ; 1999.
Abstract
HgCl(2) (0.1 mM) reduced pressure-induced water flux and root hydraulic conductivity in the roots of 1-year-old aspen (Populus tremuloides Michx.) seedlings by about 50%. The inhibition was reversed with 50 mM mercaptoethanol. Mercurial treatment reduced the activation energy of water transport in the roots from 10.82 +/- 0.700 kcal mol(-1) to 6.67 +/- 0.193 kcal mol(-1) when measured over the 4 degrees C to 25 degrees C temperature range. An increase in rhodamine B concentration in the xylem sap of mercury-treated roots suggested a decrease in the symplastic transport of water. However, the apoplastic pathway in both control and mercury-treated roots constituted only a small fraction of the total root water transport. Electrical conductivity and osmotic potentials of the expressed xylem sap suggested that 0.1 mM HgCl(2) and temperature changes over the 4 degrees C to 25 degrees C range did not induce cell membrane leakage. The 0.1 mM HgCl(2) solution applied as a root drench severely reduced stomatal conductance in intact plants, and this reduction was partly reversed by 50 mM mercaptoethanol. In excised shoots, 0.1 mM HgCl(2) did not affect stomatal conductance, suggesting that the signal that triggered stomatal closure originated in the roots. We suggest that mercury-sensitive processes in aspen roots play a significant role in regulating plant water balance by their effects on root hydraulic conductivity.
DOI: 10.1104/pp.121.3.939
PubMed: 10557243
PubMed Central: PMC59458
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings.</title><author><name sortKey="Wan" sort="Wan" uniqKey="Wan" last="Wan">Wan</name><affiliation wicri:level="1"><nlm:affiliation>Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, Alberta, Canada T6G 2E3.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, Alberta</wicri:regionArea></affiliation></author><author><name sortKey="Zwiazek" sort="Zwiazek" uniqKey="Zwiazek" last="Zwiazek">Zwiazek</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1999">1999</date><idno type="RBID">pubmed:10557243</idno><idno type="pmid">10557243</idno><idno type="pmc">PMC59458</idno><idno type="doi">10.1104/pp.121.3.939</idno><idno type="wicri:Area/Main/Corpus">004891</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">004891</idno><idno type="wicri:Area/Main/Curation">004891</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">004891</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings.</title><author><name sortKey="Wan" sort="Wan" uniqKey="Wan" last="Wan">Wan</name><affiliation wicri:level="1"><nlm:affiliation>Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, Alberta, Canada T6G 2E3.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, Alberta</wicri:regionArea></affiliation></author><author><name sortKey="Zwiazek" sort="Zwiazek" uniqKey="Zwiazek" last="Zwiazek">Zwiazek</name></author></analytic><series><title level="j">Plant physiology</title><idno type="eISSN">1532-2548</idno><imprint><date when="1999" type="published">1999</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">HgCl(2) (0.1 mM) reduced pressure-induced water flux and root hydraulic conductivity in the roots of 1-year-old aspen (Populus tremuloides Michx.) seedlings by about 50%. The inhibition was reversed with 50 mM mercaptoethanol. Mercurial treatment reduced the activation energy of water transport in the roots from 10.82 +/- 0.700 kcal mol(-1) to 6.67 +/- 0.193 kcal mol(-1) when measured over the 4 degrees C to 25 degrees C temperature range. An increase in rhodamine B concentration in the xylem sap of mercury-treated roots suggested a decrease in the symplastic transport of water. However, the apoplastic pathway in both control and mercury-treated roots constituted only a small fraction of the total root water transport. Electrical conductivity and osmotic potentials of the expressed xylem sap suggested that 0.1 mM HgCl(2) and temperature changes over the 4 degrees C to 25 degrees C range did not induce cell membrane leakage. The 0.1 mM HgCl(2) solution applied as a root drench severely reduced stomatal conductance in intact plants, and this reduction was partly reversed by 50 mM mercaptoethanol. In excised shoots, 0.1 mM HgCl(2) did not affect stomatal conductance, suggesting that the signal that triggered stomatal closure originated in the roots. We suggest that mercury-sensitive processes in aspen roots play a significant role in regulating plant water balance by their effects on root hydraulic conductivity.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">10557243</PMID><DateRevised><Year>2019</Year><Month>11</Month><Day>20</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1532-2548</ISSN><JournalIssue CitedMedium="Internet"><Volume>121</Volume><Issue>3</Issue><PubDate><Year>1999</Year><Month>Nov</Month></PubDate></JournalIssue><Title>Plant physiology</Title><ISOAbbreviation>Plant Physiol</ISOAbbreviation></Journal><ArticleTitle>Mercuric Chloride Effects on Root Water Transport in Aspen Seedlings.</ArticleTitle><Pagination><MedlinePgn>939-946</MedlinePgn></Pagination><Abstract><AbstractText>HgCl(2) (0.1 mM) reduced pressure-induced water flux and root hydraulic conductivity in the roots of 1-year-old aspen (Populus tremuloides Michx.) seedlings by about 50%. The inhibition was reversed with 50 mM mercaptoethanol. Mercurial treatment reduced the activation energy of water transport in the roots from 10.82 +/- 0.700 kcal mol(-1) to 6.67 +/- 0.193 kcal mol(-1) when measured over the 4 degrees C to 25 degrees C temperature range. An increase in rhodamine B concentration in the xylem sap of mercury-treated roots suggested a decrease in the symplastic transport of water. However, the apoplastic pathway in both control and mercury-treated roots constituted only a small fraction of the total root water transport. Electrical conductivity and osmotic potentials of the expressed xylem sap suggested that 0.1 mM HgCl(2) and temperature changes over the 4 degrees C to 25 degrees C range did not induce cell membrane leakage. The 0.1 mM HgCl(2) solution applied as a root drench severely reduced stomatal conductance in intact plants, and this reduction was partly reversed by 50 mM mercaptoethanol. In excised shoots, 0.1 mM HgCl(2) did not affect stomatal conductance, suggesting that the signal that triggered stomatal closure originated in the roots. We suggest that mercury-sensitive processes in aspen roots play a significant role in regulating plant water balance by their effects on root hydraulic conductivity.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Wan</LastName><Initials>X</Initials><AffiliationInfo><Affiliation>Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, Alberta, Canada T6G 2E3.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zwiazek</LastName><Initials>JJ</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Physiol</MedlineTA><NlmUniqueID>0401224</NlmUniqueID><ISSNLinking>0032-0889</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate 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