State of the pores in the functioning sieve plate


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ABSTRACT RECENT work in this laboratory has confirmed that the pores in the sieve plates of functioning phloem are normally occluded, fairly densely, with slime fibrils. Stems of


_Helianthus_ seedlings and thin stolons of _Saxifraga sarmentosa_ were plunged into briskly boiling water for 3 min before conventional fixation in glutaraldehyde and osmium, embedding and


sectioning for electron microscopy, In almost all cases, the pores in the sieve plates appeared plugged with densely-staining material (Fig. 1_a_ and _b_); where this was not obvious the


micrographs strongly suggested that the section had passed between the shrunken plug and the pore wall. We regard these observations as evidence against the views often put forward that the


plugging is an artefact of preparation caused either by longitudinal turgor release or by local enzyme action1,2. Access through your institution Buy or subscribe This is a preview of


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MANGO (_MANGIFERA INDICA_ L.) Article Open access 01 July 2021 EXTRACELLULAR VESICULO-TUBULAR STRUCTURES ASSOCIATED WITH SUBERIN DEPOSITION IN PLANT CELL WALLS Article Open access 18 March


2022 FOSSIL EVIDENCE OF TYLOSIS FORMATION IN LATE DEVONIAN PLANTS Article 20 April 2023 REFERENCES * Weatherley, P. E., and Johnson, R. P. C., _Intern. Rev. Cyt._, 24, 149 (1968). Article 


CAS  Google Scholar  * Shih, C. Y., and Currier, H. B., _Amer. J. Bot._, 56, 464 (1969). Article  Google Scholar  * Cronshaw, J., and Esau, K., _J. Cell. Biol_, 34, 801 (1967). Article  CAS


  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Botany, Bedford College, London, NW1 A. W. SIDDIQUI & D. C. SPANNER Authors * A. W.


SIDDIQUI View author publications You can also search for this author inPubMed Google Scholar * D. C. SPANNER View author publications You can also search for this author inPubMed Google


Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE SIDDIQUI, A., SPANNER, D. State of the Pores in the Functioning Sieve Plate. _Nature_ 226, 88


(1970). https://doi.org/10.1038/226088a0 Download citation * Received: 01 December 1969 * Issue Date: 04 April 1970 * DOI: https://doi.org/10.1038/226088a0 SHARE THIS ARTICLE Anyone you


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