Abstract
Unfertilized mature ovules of Brassica L. contain an abundance of starch in the integument cells from the micropyle to a plane approximately at the level of the central cell polar nuclei. Inside the embryo sac central cell, in the coinciding region, there are transfer cell‐like wall projections with plasma membranes appressed to their inner surfaces. H+‐ATPase is present along the inner surfaces of the wall projections as indicated by reactivity with antibody raised against plasma membrane H+‐ATPase. A number of mitochondria are in close association with wall projections in the region of the egg apparatus. Antibody raised against corn plasma membrane H+‐ATPase cross reacts with a protein of the same size in extracts of Brassica napus indicating that the two species contain a similar plasma membrane H+‐ATPase.
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