Embryological studies in Lotus glaber (Fabaceae)
The development of the female gametophyte and the pollen grain, the ultrastructure of the mature megagametophyte and the endothelial cells in Lotus glaber were examined. The anther wall development follows the dicotyledonous type. The tapetum is secretory, the microspore tetrads are tetrahedral and...
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| Autores principales: | , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00033847_v43_n2_p97_Galati |
| Aporte de: |
| Sumario: | The development of the female gametophyte and the pollen grain, the ultrastructure of the mature megagametophyte and the endothelial cells in Lotus glaber were examined. The anther wall development follows the dicotyledonous type. The tapetum is secretory, the microspore tetrads are tetrahedral and pollen grains are shed at a bicellular stage. The mature ovule is anatropous, crassinucellar and bitegmic; integuments form a zig-zag micropyle. A T-shaped megaspore tetrad is formed and the lowest megaspore is functional and produces a 7-celled embryo-sac corresponding to the Polygonum type. The synergids show ultrastructural differences, involving dictyosomes and ERr; these differences suggest a functional differentiation, probably related to the reception of the pollen tube. © Finnish Zoological and Botanical Publishing Board 2006. |
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