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Pollen wall development in flowering plants.
The outer pollen wall, or exine, is more structurally complex than any other plant cell wall, comprising several distinct layers, each with its own organizational pattern. Since elucidation of the… Expand
Ultrastructure of pollen exine in centrospermous families
Transmission electron microscopy was utilized to examine pollen walls of selected taxa in theAizoaceae, Amaranthaceae, Basellaceae, Cactaceae, Chenopodiaceae, Didiereaceae, Halophytaceae,… Expand
POLLEN MORPHOLOGY AND THE RELATIONSHIPS OF CIRCAEASTER, OF KINGDONIA, AND OF SARGENTODOXA TO THE RANUNCULALES
The pollen of three monotypic genera, Circaeaster, Kingdonia, and Sargentodoxa has been examined by light and scanning electron microscopy and in the case of the last genus, also by transmission… Expand
FINE STRUCTURAL STUDIES OF ZEA MAYS POLLEN I: CELL MEMBRANES AND EXINE ONTOGENY
Transfer of material through the microspore exine - from the loculus into the cytoplasm.
Our results and those we review indicate that the exine has a great capacity for modifications that enable nutrients to pass through from the anther loculus to the microspore cytoplasm. Avenues of… Expand
Microsporogenesis inPinus sylvestris L. VIII. Tapetal and late pollen grain development
This last portion of our developmental study ofPinus sylvestris L. pollen grains extends from just prior to the first microspore mitosis to the microsporangial dehiscence preparatory to pollen… Expand
Pollen morphology and phylogenetic relationships of the Berberidaceae
Nowicke, Joan W., and John J. Skvarla. Pollen Morphology and Phylogenetic Relationships of the Berberidaceae. Smithsonian Contributions to Botany, number 50, 83 pages, 215 figures, 3 tables,… Expand
Mutisieae (Asteraceae) Pollen Ultrastructure Atlas
Abstract: The tribe Mutisieae (excluding Barnadesieae) traditionally comprises 84 genera and approximately 900 species in three subtribes: Gochnatiinae, Mutisiinae, and Nassauviinae. We examined… Expand
Phylogenetic Implications of Pollen Morphology and Ultrastructure in The Barnadesioideae (Asteraceae)
Abstract: The subfamily Barnadesioideae of the Asteraceae consists of nine genera and approximately 90 species. Both molecular and morphological phylogenies indicate that this subfamily is sister… Expand
Pollen morphology and its phylogenetic significance in tribe Sanguisorbeae (Rosaceae)
Pollen grains of tribe Sanguisorbeae (Rosaceae, Rosoideae) were examined using scanning electron microscopy to identify useful characters, test taxonomic and phylogenetic hypotheses among genera, and… Expand