title: Ultrastructure of endothelium in ovules of Penstemon gentianoides Poir. (Scrophulariaceae) at mature embryo sac phase.
abstract: In this study ultrastructural differences between endothelial cells of different location in Penstemon gentianoides have been examined with electron microscope at mature embryo sac phase. Embryo sac is of the Polygonum type and surrounded by endothelium except the micropylar region. The cuticle is located primarily around the chalazal three-fourths of the embryo sac. Endothelium cells around the chalaza and toward the micropylar region are rich in cytoplasmic organelles. The cytoplasm of endothelial cells near the central cell has large vacuoles and few organelles. There are also plasmodesmas on the anticlinal walls of endothelial cells. The endothelium and the micropylar integumentary cells play a role in transport of metabolites into the embryo sac.
authors.affiliation: Biology Department, Science and Art Faculty, Trakya University, 22030 Edirne, Turkey.
authors.forename: Feruzan
authors.initials: F
authors.lastname: Dane
authors.forename: Göksel
authors.initials: G
authors.lastname: Olgun
authors.forename: Nuran
authors.initials: N
authors.lastname: Ekici
mesh_terms: D003593:Cytoplasm / Q000648:ultrastructure; D004727:Endothelium / Q000648:ultrastructure*; D015388:Organelles / Q000648:ultrastructure; D032263:Penstemon / Q000196:embryology* / Q000648:ultrastructure; D028502:Polygonum / Q000196:embryology / Q000648:ultrastructure; D012639:Seeds / Q000648:ultrastructure*