Document Detail

Characterization of somatic embryo attached structures in Feijoa sellowiana Berg. (Myrtaceae).
MedLine Citation:
PMID:  20336358     Owner:  NLM     Status:  MEDLINE    
The presence of an attached organ to somatic embryos of angiosperms connecting the embryo to the supporting tissue has been a subject of controversy. This study shows that 67% of the morphologically normal somatic embryos of Feijoa sellowiana possess this type of organ and that its formation was not affected by culture media composition. Histological and ultrastructural analysis indicated that the attached structures of somatic embryos displayed a great morphological diversity ranging from a few cells to massive and columnar structures. This contrast with the simple suspensors observed in zygotic embryos which were only formed by five cells. As well as the suspensor of zygotic embryos, somatic embryo attached structures undergo a process of degeneration in later stages of embryo development. Other characteristic shared by zygotic suspensors and somatic embryo attached structures was the presence of thick cell walls surrounding the cells. Elongated thin filaments were often associated with the structures attached to somatic embryos, whereas in other cases, tubular cells containing starch grains connected the embryo to the supporting tissue. These characteristics associated with the presence of plasmodesmata in the cells of the attached structures seem to indicate a role on embryo nutrition. However, cell proliferation in the attached structures resulting into new somatic embryos may also suggest a more complex relationship between the embryo and the structures connecting it to the supporting tissue.
Sandra M Correia; Jorge M Canhoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-25
Journal Detail:
Title:  Protoplasma     Volume:  242     ISSN:  1615-6102     ISO Abbreviation:  Protoplasma     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-24     Completed Date:  2010-09-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806853     Medline TA:  Protoplasma     Country:  Austria    
Other Details:
Languages:  eng     Pagination:  95-107     Citation Subset:  IM    
Laboratory of Plant Biotechnology, Centre for Pharmaceutical Studies, Department of Life Sciences, University of Coimbra, Ap. 3046, 3001-401, Coimbra, Portugal.
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MeSH Terms
Embryonic Development
Feijoa / anatomy & histology*,  cytology,  embryology*,  ultrastructure
Seeds / anatomy & histology*,  cytology,  ultrastructure

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