Abstract
In situ hybridization of sections of the ovary and ovule of Capsella bursa-pastoris with 3H-polyuridylic acid [3H-poly(U)] showed the presence of polyadenylic acid-containing RNA [poly(A) + RNA] in the cells of the placenta and nucellus. During megasporogenesis there was a decrease in 3H-poly(U) binding activity of the nucellar cells concomitant with the appearance of poly(A) + RNA in the integuments. As the typical eight-nucleate embryo sac was formed, 3H-poly(U) binding was not apparent around the quartet of nuclei at the chalazal end, while it persisted at the micropylar end. Both the egg and synergids as well as the chalazal proliferating tissue showed high concentrations of poly(A) + RNA in their cytoplasm. The results suggest a role for transient localizations of poly(A) + RNA during female sporogenesis and gametogenesis in C. bursa-pastoris.
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