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ANALYTICAL STUDIES OF THE GROWTH OF THE ETIOLATED SEEDLING OF AVENA SATIVA
Author(s) -
CAUSTON D. R.,
MER C. L.
Publication year - 1966
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1966.tb05418.x
Subject(s) - meristem , avena , elongation , cell division , mitosis , biology , seedling , botany , coleoptile , cell , microbiology and biotechnology , shoot , biochemistry , materials science , metallurgy , ultimate tensile strength
S ummary Observations have been made of cell numbers per column and the distribution of the cell length along the mesocotyl. Mathematical expressions are then derived from the calculated curves of best fit for the rate of cell production and for the mean cell length in the first millimetre of the mesocotyl below the coleoptilar node. Further expressions are deduced for mean cell length in the meristem, for the total length of the meristem, and for the number of meristematic cells present in a single column. It is now possible to describe accurately the activity of the mesocotyl meristem in the untreated plant, and so determine the effects of carbon dioxide. Considering the entire meristem, the effect of carbon dioxide is to prolong and slightly enhance cell production. This comes about through a delay in elongation of the vacuolating dividing cells. In addition carbon dioxide appears to depress slightly the potential level of mitotic activity’ of a cell of a given length or age, but this effect is more than made up for by the increase in the number of dividing cells present.