| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000435983 |
| ISSN: | 0001-3765 |
| Authors: | Gotelli, Marina M1 Lattar, Elsa C2 Zarlavsky, Gabriela1 Galati, Beatriz G1 |
| Institutions: | 1Universidad de Buenos Aires, Facultad de Agronomía, Buenos Aires. Argentina 2Universidad Nacional del Nordeste, Facultad de Ciencias Agrarias, Corrientes. Argentina |
| Year: | 2020 |
| Volumen: | 92 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | The aim of this paper is to investigate the ultrastructural events that occur during pollen grains development, with emphasis in pollen grain wall and tapetum ontogeny in Ziziphus jujuba, Z. mucronata, Paliurus spina-christi (Paliureae) and Gouania ulmifolia (Gouanieae). Anthers at different developmental stages were processed according to classic techniques for transmission electron microscopy. Differences in the number of endothecium layers and in the number of tapetal cell nuclei were found. Tapetal cells present an anastomosing tubular network and large vesicles with fibrillar content in the cytoplasm. Pollen grain development and ontogeny of pollen grain wall are similar in the four species. The number of endothecium layers, the number of nuclei of the tapetal cells and tapetal cells ultrastructure of the four species support the phylogenetic relationships previously published for the Rhamnaceae family. Tapetal vesicles with fibrillar or polysaccharide content seem to be an exclusive characteristic of the tribes Paliureae and Gouanieae. Some ultrastructural characters of the pollen grain wall development are common to other species of Rhamnaceae, such as the primexine matrix present at the microspore mother cell stage, the aperture entirely built up during the tetrad stage, the thick and fibrillar intine, and the granular infractectum |
| Disciplines: | Biología |
| Keyword: | Angiospermas, Anatomía vegetal, Polen, Ultraestructura, Tapetum, Rhamnaceae |
| Keyword: | Angiosperms, Plant anatomy, Pollen, Ultrastructure, Tapetum, Rhamnaceae |
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