دورية أكاديمية
Pollen and microsporangium development in Ziziphus jujuba, Z. mucronata, Paliurus spina-christi and Gouania ulmifolia (Rhamnaceae)
| العنوان: | Pollen and microsporangium development in Ziziphus jujuba, Z. mucronata, Paliurus spina-christi and Gouania ulmifolia (Rhamnaceae) |
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| المؤلفون: | MARINA M. GOTELLI, ELSA C. LATTAR, GABRIELA ZARVLASKY, BEATRIZ G. GALATI |
| المصدر: | Anais da Academia Brasileira de Ciências, Vol 92, Iss suppl 2 (2020) |
| بيانات النشر: | Academia Brasileira de Ciências, 2020. |
| سنة النشر: | 2020 |
| المجموعة: | LCC:Science |
| مصطلحات موضوعية: | male gametophyte development, pollen wall development, Rhamnaceae, tapetal polysaccharide vesicles, tapetum ultrastructure, Science |
| الوصف: | 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1678-2690 0001-3765 |
| Relation: | http://www.scielo.br/pdf/aabc/v92s2/0001-3765-aabc-92-s2-e20181382.pdf; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000400750&tlng=en; https://doaj.org/toc/1678-2690 |
| DOI: | 10.1590/0001-3765202020181382 |
| URL الوصول: | https://doaj.org/article/f890329657c948308e3705326d5eb523 |
| رقم الأكسشن: | edsdoj.f890329657c948308e3705326d5eb523 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16782690 00013765 |
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| DOI: | 10.1590/0001-3765202020181382 |