| Characterization of somatic embryo attached structures in Feijoa sellowiana Berg. (Myrtaceae). | |
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MedLine Citation:
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PMID: 20336358 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Sandra M Correia; Jorge M Canhoto |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-03-25 |
Journal Detail:
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Title: Protoplasma Volume: 242 ISSN: 1615-6102 ISO Abbreviation: Protoplasma Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-24 Completed Date: 2010-09-15 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9806853 Medline TA: Protoplasma Country: Austria |
Other Details:
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Languages: eng Pagination: 95-107 Citation Subset: IM |
Affiliation:
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Laboratory of Plant Biotechnology, Centre for Pharmaceutical Studies, Department of Life Sciences, University of Coimbra, Ap. 3046, 3001-401, Coimbra, Portugal. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Embryonic Development Feijoa / anatomy & histology*, cytology, embryology*, ultrastructure Seeds / anatomy & histology*, cytology, ultrastructure |
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