Cytomorphogenesis in Plants by U. B. Sleytr (auth.), Prof. Dr. Oswald Kiermayer (eds.)

By U. B. Sleytr (auth.), Prof. Dr. Oswald Kiermayer (eds.)

In 1958 E. BUNNING released a publication within the former sequence "Proto­ plasmatologia" entitled "Polaritat und inaquale Teilung des pflanzlichen Protoplasten" (polarity and unequal department of the plant protoplast) during which for the 1st time result of experimental plant cytomorphogenesis have been re­ considered. This e-book was once established thoroughly on mild microscopic observations and fairly basic experimental strategies. seeing that then our wisdom of uncomplicated cytomorphogenetic mechanisms has vastly elevated, specially with the creation of contemporary ultrastructural, biochemical and complex experi­ psychological tools in order that the sphere of cytomorphogenesis in our days might be thought of a separate self-discipline in the common box of mobilephone biology. This publication, "Cytomorphogenesis in Plants", represents an important try to compile present wisdom during this box of analysis on a related foundation. regrettably huge, immense gaps in our knowing of the underlying rules of cytomorphogenetic occasions nonetheless exist. accordingly it appeared cause­ capable of current a booklet composed of person chapters, every one written by way of specialists for an outlined experimental procedure. every one bankruptcy characterize a separate treatise with its personal references, consequently it was once impossible to prevent a few overlap either within the textual content and within the literature of the chapters with out destroying the uni­ formity of the respective article.

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Although the mechanism has not been elucidated, it seems certain that membrane recycling occurs in Pleurochrysis. The data and interpretations presented in this section are summarized in a diagrammatic cross-sectional model of the Golgi apparatus in Pleurochrysis (Fig. 13). The validity of these interpretations is supported not only by morphologic observations, but also by cytochemical enzyme localization which illustrates the sharp distinction between functional regions of the Golgi apparatus as abrupt changes in enzyme activity.

With either hypothesis the restricted space of the cisternal lumen may function as a passive orienting mechanism, constraining the micro fibrils into a spiral pattern. While it may not be possible to choose between the alternatives, there is no doubt that cellulose biosynthesis in Pleurochrysis occurs within the Golgi cisternae. While this finding is contrary to the cell surface theory of cellulose synthesis, it has been demonstrated that the Golgi apparatus in corn root caps can synthesize microfibrillar ~ 1-4 glucans (WRIGHT and NORTH COTE 1976), and KIERMAYER and colleagues (KIERMAYER and DOBBERSTEIN 1973, KIERMAYER and SLEYTR 1979) have observed that microfibrillar-synthesizing complexes on the plasma membrane of Micrasterias are derived from the Goigi apparatus (p.

A role for microtubules in exocytosis is suggested by the apparent ability of colchicine to prevent scale secretion but not synthesis (BROWN et al. 1973, BROWN and ROMANOVICZ 1976). The Golgi apparatus in Pleurochrysis is flanked by an array of microtubules (BROWN and FRANKE 1971), and also exhibits a distinctive orientation with respect to the basal bodies (see Fig. 11) which may be characteristic of Prymnesiophycean Golgi apparatus (MANTON 1964, 1967 a, b, 1968 a). Under optimal conditions, one scale is released every two minutes (BROWN 1969), implying fusion of Golgi cisternae with the plasma membrane at the same rate.

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