Cellular Interactions (Encyclopedia of Plant Physiology) by H. F. Linskens, J. Heslop-Harrison

By H. F. Linskens, J. Heslop-Harrison

H. F. LINSKENS and J. HESLOP-HARRISON The chapters of this quantity care for intercellular interplay phenomena in crops. jointly they supply a huge conspectus of a hugely energetic, if vastly fragmented, study box. sure boundaries were imposed at the material, the main impor­ tant being the exclusion of long-range interactions in the plant physique. it's precise that pervasive hormonal regulate platforms can't with ease be demarcated from controls mediated through pheromones or information-carrying molecules with extra restricted spheres of motion, yet attention is given during this quantity to the most periods of plant hormones and their features in simple terms by the way, considering those are handled effectively in different volumes of this Encyclopedia sequence (V - ume Sept. 11) and in several different texts and stories. equally, definite different results, akin to these linked to nutrition and ions, aren't thought of in any aspect. moreover, we have now excluded intracellular interactions, and in addition attention of delivery phenomena, that are taken care of intimately in Vol­ ume three of this sequence. different elements of inter-cellular interplay, corresponding to mobile floor phenomena and implications of lectin-carbohydrate interactions, and plant-virus inter-relationships, are handled in different sections of this Encyclopedia (Volumes 13B and 14B, respectively). within the quantity on physiological plant pathology (Volume four of this sequence) specific awareness has been given to host­ pathogen interplay. those facets of our topic will as a result be excluded within the current treatise.

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This last most unlikely apparent pairing of similar "organelles" in a eukaryotic alga and in a prokaryotic bacterium has been previously pointed out by PREER et al. (1974). The R-body of Paramecium is believed to be associated with a defective phage. A viral origin for the "contents" of ejectosomes and other ejectile organelles should thus be considered (PREER 1975, PREER et al. 1974, TAYLOR 1979): such an origin would at least account for their unusual phylogenetic distribution. Some viruses and some endomembrane organelles follow parallel courses in their progressive assembly within vesicles derived from the endomembrane system.

D Part of a chloroplast of the primitive land plant, Selaginel/a apus, showing its irregularly stacked thylakoids x 50,000. e A cryptomonad chloroplast, showing the two pairs of surrounding membranes (double arrows) and the nucleomorph (arrow) in the peri plastidial space between them . (Block provided by Prof. D. DODGE) x 7,800. f A chloroplast from a brown alga, Fucus serratus, showing the two pairs of surrounding membranes (arrows) with no significant periplatidial space. M. Evolution of chlor.

Estimates of the turnover time for dictyosomes in secretory cells range from 10 to 40 min (MOLLENHAUER and MORRE 1980). The dictyosomes can also have a role in protein transport and secretion (Fig. M. R. WHATLEY: reticulum, and they may well transfer to the plasmamembrane the synthetic enzymes required for cellulose synthesis. In a few cases dictyosomes are concerned with a massive secretion of proteins, as in the transfer of the adhesive protein of zoospores of the alga Enteromorpha from Golgi vesicles to the outside of the cell (EVANS and CHRISTIE 1970).

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