Download Intercellular Communication in Plants: Studies on by B. E. S. Gunning (auth.), Prof. B. E. S. Gunning, Dr. A. W. PDF

By B. E. S. Gunning (auth.), Prof. B. E. S. Gunning, Dr. A. W. Robards (eds.)

This quantity makes an attempt to summarise and combine a box of analysis in its entirety: the character of plasmodesmata, and the half those inter­ mobile connections play within the lifetime of the plant. other than within the all­ embracing early experiences of the pre-electron microscope period, there was an inclination for the topic to be approached from disparate issues of view: plant physiologists, developmental biologists, biophysicists, virologists and cytologists all contributing to the corpus of data, yet frequently with out a complete appreciation of every others' pursuits and probl­ ems, and occasionally misinterpreting every one others' findings. In June 1975 a gaggle of approximately forty experts in those numerous disciplines, all with a typical curiosity in intercellular verbal exchange in crops, met for 2 days, awarded papers, talked, argued, and commonly pooled their understand­ ledge. Out of a synthesis of manuscripts and discussions there has emerged, via an article technique of removing of pointless dupli­ cation and insertions to make sure completeness of insurance, the current publication - now not a lot a directly list of a convention, as a Monograph according to the court cases. the entire Chapters are experiences and such a lot contain hitherto unpublished facts or theoretical treatments.

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Additional info for Intercellular Communication in Plants: Studies on Plasmodesmata

Example text

It therefore became a generalisation that the plasmodesma contains a strand of endoplasmic reticulum running through the wall from cell to cell (Wardrop, 1965; Frey-Wyssling and MUhlethaler, 1965; and many others). • endoplasmic reticulum is typically connected to the plasmodesmataj in fact. many investigators think that tubules of endoplasmic reticulum are structural elements of plasmodesmata". This is a fair statement of fact, but there is little further direct evidence to clarify the nature of the connection.

4. Thick (200 nm) sections of plasmodesmata through the inner. ), fixed in glutaraldehyde and osmium tetroxide, viewed at 200 keV using a high voltage electron microscope (AEI EM7) at ele British Steel Corporation Swinden Laboratories, Rotherham. Different tilt angles (indicated in the form X/Yon each micrograph) allow 3-dimensional arrangements to be studied (especially in combination with stereoscopic viewing). There are considerable problems in viewing plasmodesmata by this method: any section thickness greater than that of the structure being observed (in this case about 50-60 nm) will reduce clarity of that structure.

Subsequently, L6pez-Saez, Gimenez-Martin and Risueno (l966a), also using permanganate fixation, concluded that the plasmodesmatal canal is traversed by a strand of endoplasmic reticulum, tightly curved into a tubule, so that the inner opaque layer of the membrane appears as a central rod (Fig. ). L6pez-Saez et al. do not dwell on the possible function of plasmodesmata, merely stating that an inter-tubular gap (the gap between the plasmalemma and the endoplasmic reticulum strand [desmotubule] through the wall) would allow some connection between the hyaloplasm of adjacent cells whereas, if there is no continuous intertubular gap, "the plasmodesm plays no physiological pole in intercellular transport".

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