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Changes in Cytoplasmic Particulates Accompanying Growth in the Mesocotyl of Zea Mays 1
Author(s) -
Key J. L.,
Hanson J. B.,
Lund H. A.,
Vatter A. E.
Publication year - 1961
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1961.0011183x000100010003x
Subject(s) - biochemist , library science , citation , classics , computer science , history
IT HAS been found that as the cells of corn roots elongate and mature the cytoplasm undergoes several changes (7). There is a decrease in the relative number of microsomal (ribonucleoprotein) granules per unit of cytoplasmic protein and an increase in membranous material and mitochondria. The oxidative activity of the mitochondria is greatest in the region of cell expansion. These cytoplasmic changes in corn root cells are correlated with changes in such physiological activities as tissue respiration (7) and ion accumulation (4). In order to ascertain whether the pattern of cytoplasmic ontogeny shown by the root cell is to be found in other growing tissues, a similar investigation has been made with the mesocotyl of corn seedlings. This organ is a true internode which grows by means of cell division and elongation in the region just below the coleoptilar node (1). Hence, as in the root, successive sections beginning at the node provide tissue of progressively greater mean cell maturity.