| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000417614 |
| ISSN: | 0001-3765 |
| Authors: | Yañez, Agustina1 Márquez, Gonzalo J2 Morbelli, Marta A2 |
| Institutions: | 1Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", División Plantas Vasculares, Buenos Aires. Argentina 2Universidad Nacional de La Plata, Facultad de Ciencias Naturales y Museo, La Plata, Buenos Aires. Argentina |
| Year: | 2017 |
| Season: | Dic |
| Volumen: | 89 |
| Number: | 4 |
| Pages: | 2731-2748 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and wall structure of Blotiella lindeniana, Histiopteris incisa and Paesia glandulosa from the Paranaense Phytogeographic Province were studied using light microscope, and scanning and transmission electron microscope. The exospore has two layers and, according to the species, the exospore surface bears pila, echinae, verrucae, bacula and tubercles. The perispore has two or three layers and its surface is psilate, baculate or rugulate. The variability found in the sculpture of the spores and their stratification and ultrastructure of perispore reflects the morphological differences observed in the sporophyte of the species studied. Additionally, while the stratification and ultrastructure of the exospore is shared by the Dennstaedtiaceae species, their ornamentation could be a character to distinguish species into the clade “hypolepidoide”. The finding of spores with similar characteristics in phylogenetically unrelated families allows us to suggest that palynological features do not have an evolutionary value to establish relationships between groups above the genus level |
| Disciplines: | Biología |
| Keyword: | Briofitas y pteridofitas, Anatomía vegetal, Helechos, Esporas, Esporófito, Ultraestructura, Blotiella lindeniana, Histiopteris incisa, Paesia glandulosa, Dennstaedtiaceae |
| Keyword: | Briophytes and pteridophytes, Plant anatomy, Ferns, Spores, Sporophyte, Ultrastructure, Blotiella lindeniana, Histiopteris incisa, Paesia glandulosa, Dennstaedtiaceae |
| Full text: | Texto completo (Ver HTML) |
