Fluoride inhibits root water transport and affects leaf expansion and gas exchange in aspen (Populus tremuloides) seedlings.
Identifieur interne : 004442 ( Main/Exploration ); précédent : 004441; suivant : 004443Fluoride inhibits root water transport and affects leaf expansion and gas exchange in aspen (Populus tremuloides) seedlings.
Auteurs : Mohammed Kamaluddin [Canada] ; Janusz J. ZwiazekSource :
- Physiologia plantarum [ 1399-3054 ] ; 2003.
Abstract
The effects of sodium fluoride (0.3, 5 and 10 mM NaF) on root hydraulic conductivity, and gas exchange processes were examined in aspen (Populus tremuloides Michx.) seedlings grown in solution culture. A long-term exposure of roots to NaF significantly decreased root hydraulic conductivity (Lp) and stomatal conductance ( gs). Root absorbed NaF significantly affected electrolyte leakage in leaf tissues and substantially restricted leaf expansion. NaF did not significantly affect leaf chlorophyll contents but decreased net photosynthesis (Pn). A short-term exposure of excised roots to 5 mM NaF and KF significantly decreased root water flow (Qv) with a concomitant decline in root respiration and reduced gs when applied through intact roots or excised stems. The same molar concentration of NaCl also decreased Qv and gs in intact seedlings, but to a lesser extent than NaF or KF, and did not significantly affect root respiration. The results suggest that fluoride metabolically inhibited Qv or Lp, probably by affecting water channel activity. We suggest that the metabolic inhibition of Lp by root-absorbed fluoride affected gas exchange and leaf expansion in aspen seedlings.
DOI: 10.1034/j.1399-3054.2003.00040.x
PubMed: 12654037
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Zwiazek</name></author></analytic><series><title level="j">Physiologia plantarum</title><idno type="eISSN">1399-3054</idno><imprint><date when="2003" type="published">2003</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The effects of sodium fluoride (0.3, 5 and 10 mM NaF) on root hydraulic conductivity, and gas exchange processes were examined in aspen (Populus tremuloides Michx.) seedlings grown in solution culture. A long-term exposure of roots to NaF significantly decreased root hydraulic conductivity (Lp) and stomatal conductance ( gs). Root absorbed NaF significantly affected electrolyte leakage in leaf tissues and substantially restricted leaf expansion. NaF did not significantly affect leaf chlorophyll contents but decreased net photosynthesis (Pn). A short-term exposure of excised roots to 5 mM NaF and KF significantly decreased root water flow (Qv) with a concomitant decline in root respiration and reduced gs when applied through intact roots or excised stems. The same molar concentration of NaCl also decreased Qv and gs in intact seedlings, but to a lesser extent than NaF or KF, and did not significantly affect root respiration. The results suggest that fluoride metabolically inhibited Qv or Lp, probably by affecting water channel activity. We suggest that the metabolic inhibition of Lp by root-absorbed fluoride affected gas exchange and leaf expansion in aspen seedlings.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">12654037</PMID><DateRevised><Year>2019</Year><Month>11</Month><Day>20</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1399-3054</ISSN><JournalIssue CitedMedium="Internet"><Volume>117</Volume><Issue>3</Issue><PubDate><Year>2003</Year><Month>Mar</Month></PubDate></JournalIssue><Title>Physiologia plantarum</Title><ISOAbbreviation>Physiol Plant</ISOAbbreviation></Journal><ArticleTitle>Fluoride inhibits root water transport and affects leaf expansion and gas exchange in aspen (Populus tremuloides) seedlings.</ArticleTitle><Pagination><MedlinePgn>368-375</MedlinePgn></Pagination><Abstract><AbstractText>The effects of sodium fluoride (0.3, 5 and 10 mM NaF) on root hydraulic conductivity, and gas exchange processes were examined in aspen (Populus tremuloides Michx.) seedlings grown in solution culture. A long-term exposure of roots to NaF significantly decreased root hydraulic conductivity (Lp) and stomatal conductance ( gs). Root absorbed NaF significantly affected electrolyte leakage in leaf tissues and substantially restricted leaf expansion. NaF did not significantly affect leaf chlorophyll contents but decreased net photosynthesis (Pn). A short-term exposure of excised roots to 5 mM NaF and KF significantly decreased root water flow (Qv) with a concomitant decline in root respiration and reduced gs when applied through intact roots or excised stems. The same molar concentration of NaCl also decreased Qv and gs in intact seedlings, but to a lesser extent than NaF or KF, and did not significantly affect root respiration. The results suggest that fluoride metabolically inhibited Qv or Lp, probably by affecting water channel activity. We suggest that the metabolic inhibition of Lp by root-absorbed fluoride affected gas exchange and leaf expansion in aspen seedlings.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Kamaluddin</LastName><ForeName>Mohammed</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Department of Renewable Resources, 4-42 Earth Sciences Bldg., University of Alberta, Edmonton, Alberta T6G 2E3, Canada.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zwiazek</LastName><ForeName>Janusz J.</ForeName><Initials>JJ</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>Denmark</Country><MedlineTA>Physiol Plant</MedlineTA><NlmUniqueID>1256322</NlmUniqueID><ISSNLinking>0031-9317</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2003</Year><Month>3</Month><Day>26</Day><Hour>5</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2003</Year><Month>3</Month><Day>26</Day><Hour>5</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2003</Year><Month>3</Month><Day>26</Day><Hour>5</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">12654037</ArticleId><ArticleId IdType="pii">040</ArticleId><ArticleId IdType="doi">10.1034/j.1399-3054.2003.00040.x</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>Canada</li></country></list><tree><noCountry><name sortKey="Zwiazek, Janusz J" sort="Zwiazek, Janusz J" uniqKey="Zwiazek J" first="Janusz J." last="Zwiazek">Janusz J. Zwiazek</name></noCountry><country name="Canada"><noRegion><name sortKey="Kamaluddin, Mohammed" sort="Kamaluddin, Mohammed" uniqKey="Kamaluddin M" first="Mohammed" last="Kamaluddin">Mohammed Kamaluddin</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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