By Victor B. Ivanov (auth.), R. Brouwer, O. Gašparíková, J. Kolek, B. C. Loughman (eds.)
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Additional info for Structure and Function of Plant Roots: Proceedings of the 2nd International Symposium, held in Bratislava, Czechoslovakia, September 1–5, 1980
Nuclei ofroot meristems, in particular, are favoured for structural studies since they are so readily available and because they are also so obviously active in the genetic and metabolic activities that result in mitosis, cell growth and cell differentiation. Micrographs showing the appearance of chromatin, nucleolus and nuclear envelope in meristematic cells are familiar illustrations in most books on plant cytology. However, patient searching of electron microscope sections, and the use ofnew cytochemical techniques, can reveal structures within the nucleus that are less familiar, and whose significance or function is unknown.
La). 3H-uridinelabeled newly synthesized RNA is primarily loealized in the pre-ribosomal zone eorresponding to the polysomes throughout seed maturation and on the 30th day after anthesis a eomponent is present in the postribosomal zone whieh probably represents free informosomes. 52 gjem 3 whieh is typical for polysomes. 43 gjem 3 which is typieal for free informosomes appears 35-37 days after anthesis (Fig. lb). Sedimentation and density analysis show that aetive synthesis of different RNP partieles is maintained in the root almost until the final stages of seed development.
Lb). Sedimentation and density analysis show that aetive synthesis of different RNP partieles is maintained in the root almost until the final stages of seed development. Thus, aetive eell division and intensive metabolism before the final stages of maturation determine the formation of a eomplex system providing the speeifieity of growth and metabolie transformations during early stages of seed germination. 21 REFERENCES l. Martyn, G. , Musatenko, L. , Nesterova, A. N. and Berestetsky, V. A. 1980 Morphophysio- logical characteristic ofbean seed embryo at the embryonal period of development.
Structure and Function of Plant Roots: Proceedings of the 2nd International Symposium, held in Bratislava, Czechoslovakia, September 1–5, 1980 by Victor B. Ivanov (auth.), R. Brouwer, O. Gašparíková, J. Kolek, B. C. Loughman (eds.)