Anatomical features associated with water transport in imperforate tracheary elements of vessel-bearing angiosperms
Identifieur interne : 000090 ( Ncbi/Checkpoint ); précédent : 000089; suivant : 000091Anatomical features associated with water transport in imperforate tracheary elements of vessel-bearing angiosperms
Auteurs : Yuzou Sano [Japon] ; Hugh Morris [Royaume-Uni] ; Hiroshi Shimada [Japon] ; Louis P. Ronse De Craene [Royaume-Uni] ; Steven Jansen [Royaume-Uni]Source :
- Annals of Botany [ 0305-7364 ] ; 2011.
Abstract
Imperforate tracheary elements (ITEs) in wood of vessel-bearing angiosperms may or may not transport water. Despite the significance of hydraulic transport for defining ITE types, the combination of cell structure with water transport visualization
Visualization of water transport was studied in 15 angiosperm species by dye injection and cryo-scanning electron microscopy. Structural features of ITEs were examined using light and electron microscopy.
ITEs connected to each other by pit pairs with complete pit membranes contributed to water transport, while cells showing pit membranes with perforations up to 2 µm were hydraulically not functional. A close relationship was found between pit diameter and pit density, with both characters significantly higher in conductive than in non-conductive cells. In species with both conductive and non-conductive ITEs, a larger diameter was characteristic of the conductive cells. Water transport showed no apparent relationship with the length of ITEs and vessel grouping.
The structure and density of pits between ITEs represent the main anatomical characters determining water transport. The pit membrane structure of ITEs provides a reliable, but practically challenging, criterion to determine their conductive status. It is suggested that the term tracheids should strictly be used for conductive ITEs, while fibre-tracheids and libriform fibres are non-conductive.
Url:
DOI: 10.1093/aob/mcr042
PubMed: 21385773
PubMed Central: 3080625
Affiliations:
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<author><name sortKey="Sano, Yuzou" sort="Sano, Yuzou" uniqKey="Sano Y" first="Yuzou" last="Sano">Yuzou Sano</name>
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<series><title level="j">Annals of Botany</title>
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<front><div type="abstract" xml:lang="en"><sec><title>Background and Aims</title>
<p>Imperforate tracheary elements (ITEs) in wood of vessel-bearing angiosperms may or may not transport water. Despite the significance of hydraulic transport for defining ITE types, the combination of cell structure with water transport visualization <italic>in planta</italic>
has received little attention. This study provides a quantitative analysis of structural features associated with the conductive vs. non-conductive nature of ITEs.</p>
</sec>
<sec><title>Methods</title>
<p>Visualization of water transport was studied in 15 angiosperm species by dye injection and cryo-scanning electron microscopy. Structural features of ITEs were examined using light and electron microscopy.</p>
</sec>
<sec><title>Key Results</title>
<p>ITEs connected to each other by pit pairs with complete pit membranes contributed to water transport, while cells showing pit membranes with perforations up to 2 µm were hydraulically not functional. A close relationship was found between pit diameter and pit density, with both characters significantly higher in conductive than in non-conductive cells. In species with both conductive and non-conductive ITEs, a larger diameter was characteristic of the conductive cells. Water transport showed no apparent relationship with the length of ITEs and vessel grouping.</p>
</sec>
<sec><title>Conclusions</title>
<p>The structure and density of pits between ITEs represent the main anatomical characters determining water transport. The pit membrane structure of ITEs provides a reliable, but practically challenging, criterion to determine their conductive status. It is suggested that the term tracheids should strictly be used for conductive ITEs, while fibre-tracheids and libriform fibres are non-conductive.</p>
</sec>
</div>
</front>
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<li>Royaume-Uni</li>
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<name sortKey="Shimada, Hiroshi" sort="Shimada, Hiroshi" uniqKey="Shimada H" first="Hiroshi" last="Shimada">Hiroshi Shimada</name>
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<country name="Royaume-Uni"><noRegion><name sortKey="Morris, Hugh" sort="Morris, Hugh" uniqKey="Morris H" first="Hugh" last="Morris">Hugh Morris</name>
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<name sortKey="Jansen, Steven" sort="Jansen, Steven" uniqKey="Jansen S" first="Steven" last="Jansen">Steven Jansen</name>
<name sortKey="Ronse De Craene, Louis P" sort="Ronse De Craene, Louis P" uniqKey="Ronse De Craene L" first="Louis P." last="Ronse De Craene">Louis P. Ronse De Craene</name>
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