Abstract
Measurements are presented (Tables I and II) concerning the incorporation of 35SO 4 = into whole embryos, into meridional, animal and vegetal halves. The measurements refer to early gastrula stage with inclusion of data pertaining to later stages of gastrulation and to complete gastrulae. When the data are referred to equal volume no significant differences are found between the different categories of embryos (whole embryos or halves of different kinds). This indicates that the rate of uptake of sulfate may be about equal in the different regions of the embryo, and this is not in disagreement with available histochemical and autoradiographic data. These results are in contrast to the strikingly different effects of deprivation of sulfate on animal and vegetal regions in whole embryos and on animal and vegetal halves, as known from previous work [13, 19]. The concentration of available sulfate may not differ, but sulfate may be required to different extent in the different embryonic regions.
Published Version
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