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Pollen, tapetum, and orbicule development in Colletia paradoxa and Discaria americana [Rhamnaceae]

Por: Gotelli, Marina María.
Colaborador(es): Galati, Beatriz Gloria | Medan, Diego.
ISSN: 1537-744X.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): LIPID | GELATIN | GLYCEROL | CELL MATURATION | CELL STRUCTURE | CELL WALL | COLLETIA PARADOXA | CYTOPLASM | DISCARIA AMERICANA | GOLGI COMPLEX | MICROSPORE | MITOCHONDRION | ORBICULE | PLANT CELL | PLANT DEVELOPMENT | PLANT STRUCTURES | POLLEN | POLLEN MOTHER CELL | RHAMNACEAE | ROUGH ENDOPLASMIC RETICULUM | TAPETUM | TRANSMISSION ELECTRON MICROSCOPY | CEREAL | CHEMISTRY | METABOLISM | METHODOLOGY | PHYSIOLOGY | PLANT PHYSIOLOGY | SPECIES DIFFERENCE | CEREALS | CYTOPLASM | ENDOPLASMIC RETICULUM, ROUGH | LIPIDS | MICROSCOPY, ELECTRON, TRANSMISSION | PLANT PHYSIOLOGICAL PHENOMENA | SPECIES SPECIFICITY | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: The Scientific World Journal vol.2012 (2012), p.1-8Resumen: Tapetum, orbicule, and pollen grain ontogeny in Colletia paradoxa and Discaria americana were studied with transmission electron microscopy [TEM]. The ultrastructural changes observed during the different stages of development in the tapetal cells and related to orbicule and pollen grain formation are described. The proorbicules have the appearance of lipid globule, and their formation is related to the endoplasmic reticulum of rough type [ERr]. This is the first report on the presence of orbicules in the family Rhamnaceae. Pollen grains are shed at the bicellular stage.
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Tapetum, orbicule, and pollen grain ontogeny in Colletia paradoxa and Discaria americana were studied with transmission electron microscopy [TEM]. The ultrastructural changes observed during the different stages of development in the tapetal cells and related to orbicule and pollen grain formation are described. The proorbicules have the appearance of lipid globule, and their formation is related to the endoplasmic reticulum of rough type [ERr]. This is the first report on the presence of orbicules in the family Rhamnaceae. Pollen grains are shed at the bicellular stage.

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