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AuthorZhang,Yadc.contributor.author
Date of accession2018-10-22T14:56:31Zdc.date.accessioned
Available in OPARU since2018-10-22T14:56:31Zdc.date.available
Year of creation2018dc.date.created
Date of first publication2018-10-22dc.date.issued
AbstractInterconduit pit membranes represent porous media for water transport between neighbouring conduits. Anatomical observations of bordered pits and their pit membranes in vesselless and vessel-bearing angiosperms based on light, scanning and transmission electron microscopy (SEM and TEM) are required to understand functional questions surrounding embolism formation. Perfusion with colloidal gold was performed to compare the relative porosity between fresh and dried-rehydrated membranes. Besides, a pneumatic method constructing vulnerability curves based on air flow measurements of terminal branch ends was applied for 10 temperate tree species, including six diffuse, two ring-porous and two gymnosperm species, and compared with the flow-centrifuge or the hydraulic-bench dehydration method. Shrunken, damaged and aspirated pit membranes caused by dehydration were 50 % thinner than pit membranes in fresh samples. Dehydration caused larger poses in dried-rehydrated pit membranes of Drimys winteri, but smaller pores in dried-rehydrated pit membranes of three vessel-bearing angiosperms. the pneumatic method provided a good estimate of the degree of xylem embolism for all angiosperm species but showed significantly reduced Ψ50 values for the two conifers. pit membrane shrinkage is irreversible and associated with a considerable increase in pore size. The findings suggest that the shrinkage of pit membranes, which may occur in planta, is irreversible. Moreover, the pneumatic method could provide a fast and accurate approach for angiosperms due to its convenience and feasibility, at least within the range of embolism resistances covered by our samples.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
Has partBordered pits in xylem of vesselless angiosperms and their possible misinterpretation as perforation plates.dc.relation.haspart
Has partTesting the plant pneumatic method to estimate xylem embolism resistance in stems of temperate trees.dc.relation.haspart
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
KeywordBordered pitsdc.subject
KeywordPit membranedc.subject
Dewey Decimal GroupDDC 580 / Botanical sciencesdc.subject.ddc
LCSHEmbolismdc.subject.lcsh
LCSHMembranes (Biology)dc.subject.lcsh
LCSHDehydration (Physiology)dc.subject.lcsh
TitleThe functional morphology of interconduit pit membranes in fresh and dehydrated xylem tissues of angiosperm speciesdc.title
Resource typeDissertationdc.type
Date of acceptance2018-09-07dcterms.dateAccepted
RefereeJansen, Stevendc.contributor.referee
RefereeWalther, Pauldc.contributor.referee
DOIhttp://dx.doi.org/10.18725/OPARU-10202dc.identifier.doi
PPN1041692838dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-oparu-10259-8dc.identifier.urn
GNDMembrandc.subject.gnd
GNDXylemdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
InstitutionInstitut für Systematische Botanik und Ökologieuulm.affiliationSpecific
InstitutionZE Elektronenmikroskopieuulm.affiliationSpecific
Grantor of degreeFakultät für Naturwissenschaftenuulm.thesisGrantor
DCMI TypeTextuulm.typeDCMI
CategoryPublikationenuulm.category
DOI of original publication10.1111/pce.13014dc.relation1.doi
DOI of original publication10.1093/treephys/tpy015dc.relation1.doi
Bibliographyuulmuulm.bibliographie


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