Document Detail

Development of mucilage cells of Araucaria angustifolia (Araucariaceae).
MedLine Citation:
PMID:  18239849     Owner:  NLM     Status:  MEDLINE    
The roles of mucilage cells were investigated through morphological and cytological analysis during leaf development in young Araucaria angustifolia plants. Differentiation began in leaf primordia in the shoot apex, when the young cells underwent a greater increase in volume in comparison with other mesophyll cells. The mucilage polysaccharides were synthesized by dictyosomes, from where they were taken by large vesicles and released into a cavity formed by detachment of the tonoplast, which was separated from the cytoplasm. At the end of differentiation, the cell was completely filled with mucilage, a gel consisting of a denser reticular structure surrounding less dense regions. The nucleus and cytoplasm were degenerated in mature cells. The A. angustifolia mucilage cells presented some cytological resemblances to the mucilage cells of members of some dicotyledonous families; however, differences in the dictyosomes and the secretion route were observed. Translocation and water storage of solutes was suggested by the use of the hydroxy pyrenetrisulfonic acid tri-sodium salt apoplastic tracer. The tonoplast detachment, dechromatinization, nuclear condensation, and general degeneration of the membrane systems observed during maturity indicated a programmed cell death process, one not yet described for angiosperm mucilage cells.
A A Mastroberti; J E de Araujo Mariath
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Protoplasma     Volume:  232     ISSN:  0033-183X     ISO Abbreviation:  Protoplasma     Publication Date:  2008  
Date Detail:
Created Date:  2008-09-03     Completed Date:  2008-09-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806853     Medline TA:  Protoplasma     Country:  Austria    
Other Details:
Languages:  eng     Pagination:  233-45     Citation Subset:  IM    
Departamento de Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
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MeSH Terms
Angiosperms / cytology
Chloroplasts / ultrastructure
Coniferophyta / cytology*,  ultrastructure
Plant Leaves / cytology,  ultrastructure
Plant Shoots / ultrastructure
Sulfonic Acids
Vacuoles / ultrastructure
Reg. No./Substance:
0/Sulfonic Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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