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231225s1998 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.1998.00298.x
|2 doi
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|a pubmed24n1080.xml
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|a DE-627
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|e rakwb
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|a eng
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|a Ligrone, Roberto
|e verfasserin
|4 aut
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|a The leafy stems of Sphagnum (Bryophyta) contain highly differentiated polarized cells with axial arrays of endoplasmic microtubules
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|c 1998
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 19.04.2021
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Contrary to the long-held belief that, internal to the cortical sterome, the central region of Sphagnum stems comprises unspecialized parenchyma, the present light- and electron-microscope study has revealed that these cells in fact have a highly specialized cytoplasmic organization. Their key features are: (a) the absence of large central vacuoles; (b) a spindle-shaped nucleus positioned internally; (c) a prominent axial system of endoplasmic microtubules associated with the nucleus, mitochondria, pleomorphic vacuoles, and membrane-bounded tubules and vesicles; (d) a distinct cytoplasmic polarization, with the cellular region near the capitulum being richer in organelles than the basal region; and (e) a high frequency of plasmodesmata in the cross walls with an enlarged median region containing no discernible desmotubule. Such a distinctive combination of cytological features has been hitherto only described for putative food-conducting cells in bryoid mosses. The results introduce a major new character common to Sphagnum and bryoid mosses and strongly suggest that this cytological organization underlines cellular specialization in symplasmic transport
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|a Journal Article
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|a Sphagnum
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| 650 |
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|a cytoplasmic polarity
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| 650 |
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|a microtubules
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| 650 |
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|a plasmodesmata
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| 650 |
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|a symplasmic transport
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|a Duckett, Jeffrey G
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 140(1998), 3 vom: 18. Nov., Seite 567-579
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|x 1469-8137
|7 nnns
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|g volume:140
|g year:1998
|g number:3
|g day:18
|g month:11
|g pages:567-579
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|u http://dx.doi.org/10.1111/j.1469-8137.1998.00298.x
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