Fig. 3
Mature embryo sac of Polianthes tuberosa var. Simple. a Polygonum type normal embryo sac development. b–d Abnormalities found in mature embryo sacs. b Embryo sac with retarded development with only two nuclei. c Colapsed embryo sac. d Embryo sac without egg apparatus and abnormal growth of the uniseriate nucellar tissue. ccn central cell nucleus, ccv central cell vacuole, ea egg apparatus, n1 and n2 nuclei, ch chalaza, m micropyle, arrow heads in (a) antipodal cells, arrow heads in (c) collapsed embryo sac, arrow heads in (d) abnormal growth of uniseriate nucellar tissue. Bars 10 µm