Linked Life Data

18086222

Source:http://linkedlifedata.com/resource/pubmed/id/18086222

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2008-2-15
pubmed:abstractText
Many wetland plants have gas films on submerged leaf surfaces. We tested the hypotheses that leaf gas films enhance CO(2) uptake for net photosynthesis (P(N)) during light periods, and enhance O(2) uptake for respiration during dark periods. Leaves of four wetland species that form gas films, and two species that do not, were used. Gas films were also experimentally removed by brushing with 0.05% (v/v) Triton X. Net O(2) production in light, or O(2) consumption in darkness, was measured at various CO(2) and O(2) concentrations. When gas films were removed, O(2) uptake in darkness was already diffusion-limited at 20.6 kPa (critical O(2) pressure for respiration, COP(R)>/= 284 mmol O(2) m(-3)), whereas for some leaves with gas films, O(2) uptake declined only at approx. 4 kPa (COP(R) 54 mmol O(2) m(-3)). Gas films also improved CO(2) uptake so that, during light periods, underwater P(N) was enhanced up to sixfold. Gas films on submerged leaves enable continued gas exchange via stomata and thus bypassing of cuticle resistance, enhancing exchange of O(2) and CO(2) with the surrounding water, and therefore underwater P(N) and respiration.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0028-646X
pubmed:author
pubmed:issnType
Print
pubmed:volume
177
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
918-26
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Underwater photosynthesis and respiration in leaves of submerged wetland plants: gas films improve CO2 and O2 exchange.
pubmed:affiliation
School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't