Nucellar cells in Phaius tankervilliae(Aiton) Bl.were observed under transmission electron microscope.Some distinct characteristics were found during the programmed cell death(PCD) of nucellar cells in P.tankervilliae,such as the vacuole splinter,demonstrating the chromatin condensation and cytoplasm disorganization.Many protuberances were present at the megasporocyte cell wall adjacent to the lateral nucellar cells before the formation of the functional megaspore.With the enlargement of the embryo sac,the ...