Document Detail


Effect and analysis of phenolic compounds during somatic embryogenesis induction in Feijoa sellowiana Berg.
MedLine Citation:
PMID:  18767216     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of phenolic compounds on somatic embryogenesis in Feijoa sellowiana was analysed. The results showed that caffeic acid (140-560 microM) significantly increased somatic embryogenesis induction compared with the control. The presence of phloridzin, even at lower concentrations (11.5 microM), or caffeic acid or phloroglucinol at concentrations greater than 140.0 and 197.5 microM, respectively, inhibited somatic embryo development beyond the globular stage. When somatic embryos were transferred to the germination medium, the highest rates of germination (81.9%) were obtained with embryos induced in the presence of phloroglucinol (79.0 microM). At all concentrations tested, somatic embryos induced in medium containing phloroglucinol germinated at higher rates than those induced in the presence of caffeic acid. Histological and ultrastructural studies showed that somatic embryos were formed in close association with phenolic-rich cells which, in more advanced stages of development, formed a zone isolating the embryo from the maternal tissue. A comparative analysis of total phenolic content indicated that phenolics reached a peak by the third week of culture, independently of the medium used. However, after that period, the amount of phenolic compounds was significantly higher in explants cultured in the presence of phloroglucinol than in those cultured in the control or in caffeic acid-containing medium. Attempts to identify the type of phenolic compounds showed that flavan-3-ols and gallic acid derivatives were mainly produced in phloroglucinol-containing medium, whereas flavanones and dihydroflavonols were also present in medium containing caffeic acid. Flavones were the main phenols detected in the control. The ways in which phenolic compounds may affect somatic embryogenesis are discussed.
Authors:
E Reis; M T Batista; J M Canhoto
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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:  193-202     Citation Subset:  IM    
Affiliation:
Laboratory of Plant Biotechnology, Centre for Pharmaceutical Studies, Department of Botany, University of Coimbra, Coimbra, Portugal.
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MeSH Terms
Descriptor/Qualifier:
Chromatography, High Pressure Liquid
Culture Media
Embryonic Development / drug effects*
Feijoa / cytology,  drug effects*,  embryology*,  ultrastructure
Germination / drug effects
Phenols / analysis,  pharmacology*
Seeds / cytology,  drug effects,  ultrastructure
Time Factors
Chemical
Reg. No./Substance:
0/Culture Media; 0/Phenols

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


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