Anatomical and biochemical changes associated with thedevelopment and germination of Araucaria angustifolia seeds
Acta sci., Biol. sci
;
41: e43381, 20190000. ilus, graf
Artigo
em Inglês
| LILACS, VETINDEX
| ID: biblio-1460849
ABSTRACT
This study aimed at assessing the cell cycle, and anatomical and biochemical changes that the embryonic axis of Araucaria angustifolia undergoes during development, focusing on the maturation stage. During all development, cells exhibited intense metabolic activity with an abundance of mitochondria, lipid bodies, and vacuolated cells. The continued accumulation of starch and protein was observed by LM and TEM and indicated by spectra of FTIR. Cell differentiation of the procambium was observed with a thickening of the cell wall and the formation of resiniferous ducts. At Stage III and IV, cells exhibited structural changes such as altered or elongated mitochondria and presence of plastoglobules. These results suggest that there is a gradual transition from developmental metabolism to germination metabolism. Such changes can contribute to the rapid germination of seeds right after their dispersion, making it an ecological strategy to reduce post-dispersal exposure to predators and to avoid damage from reduced moisture.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Sementes
/
Germinação
Tipo de estudo:
Fatores de risco
Idioma:
Inglês
Revista:
Acta sci., Biol. sci
Ano de publicação:
2019
Tipo de documento:
Artigo
Instituição/País de afiliação:
Universidade Federal Rural da Amazônia/BR
/
Universidade Federal de Juiz de Fora/BR
/
Universidade Federal de Santa Catarina/BR
/
Universidade do Estado de Santa Catarina/BR
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