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POSSIBLE SIGNIFICANCE OF NUCLEAR VOLUME CHANGE DURING EARLY DEVELOPMENT OF NEWT EMBRYOS
Author(s) -
IMOH HIROSHI,
SAMESHIMA MUNEFUMI
Publication year - 1976
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1976.00045.x
Subject(s) - blastula , embryo , germinal vesicle , endoderm , gastrulation , biology , triturus , volume (thermodynamics) , embryogenesis , anatomy , chemistry , microbiology and biotechnology , physics , cellular differentiation , thermodynamics , genetics , oocyte , gene
The nuclear volumes at several stages of development were measured on Triturus pyrrhogaster embryos and changes in the fine structure and reactivity towards alkaline fast green of the nuclei were also examined. It was shown that the blastula nuclei were reduced about 80% to reach a constant volume of about 1,400 μm 3 by the tail bud stage in ectomesodermal parts of the embryos. In the endoderm, the decrease in the nuclear volume was slightly delayed. Application of the decreasing rate of nuclear volume, from blastula to gastrula, to a simple model suggested that an amount of material, equivalent to that of a full‐sized germinal vesicle, is stored in the egg to support the rapid nuclear divisions during the early phase of development.