Structural and histochemical attributes of secretory ducts and cavities in leaves of four species of Calophyllaceae J. Agardh in Amazonian savannas.
metabolites
mucilage
plant-environment interactions
secretion mechanism
ultrastructure
Journal
Plant biology (Stuttgart, Germany)
ISSN: 1438-8677
Titre abrégé: Plant Biol (Stuttg)
Pays: England
ID NLM: 101148926
Informations de publication
Date de publication:
Nov 2021
Nov 2021
Historique:
revised:
21
06
2021
received:
05
05
2021
accepted:
01
07
2021
pubmed:
7
9
2021
medline:
30
10
2021
entrez:
6
9
2021
Statut:
ppublish
Résumé
This study represents an important contribution to the structural, histochemical and biological understanding of ducts and cavities in leaves of four species of Calophyllaceae that occur in Amazonian savannas. Samples of adult leaves were processed using light, scanning and transmission electron microscopy, as per usual methods for plant anatomy. In paradermal sections, the lumina of ducts are elongated while those of cavities are short. Ducts occur exclusively in the central rib and are abundant in Kielmeyera rubriflora Cambess and Kielmeyera coriacea Mart. and Zucc and larger than in Calophyllum brasiliense Cambess and Caraipa densifolia Mart. In mesophyll, the type of secretory structure and distribution pattern of the ducts and cavities are distinct. In most species, the secreted metabolites are similar and consist of phenolic compounds, lipids, essential oils with oleoresins, mucilage, neutral polysaccharides, proteins and alkaloids, except in K. coriacea, which does not contain oleoresin. The secretion is probably synthesized by mitochondria, rough endoplasmic reticulum, ribosomes and dictyosomes and is externalized toward the lumen by granulocrine and eccrine processes. In addition to being of diagnostic value for species identification, the attributes of the lumen shape, type of secretory structure, distribution pattern, identified metabolites and secretion mechanism are important for understanding the biological roles of ducts and cavities. The identified metabolites reveal a capacity for adaptation, resistance and protection from the action of herbivores and pathogens, and in water retention.
Substances chimiques
Oils, Volatile
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1128-1140Subventions
Organisme : Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Organisme : Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Organisme : Conselho Nacional de Desenvolvimento Científico e Tecnológico
Informations de copyright
© 2021 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.
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