Document Detail


The osmotic property and fluorescent tracer movement of developing orchid embryos of Phaius tankervilliae (Aiton) Bl.
MedLine Citation:
PMID:  20467876     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The suspensor plays an active role during the early embryo development of flowering plants. In orchids, the suspensor cells are highly vacuolated without structural specializations, and the possible mechanism(s) that enable the suspensor to serve as the nutrient uptake site is virtually unknown. Here, we used the fluorescent tracer CFDA to characterize the pathway for symplastic transport in the suspensor cells of developing embryos and to provide direct visual evidence that the orchid suspensor has unique physiological properties. The embryo proper uptakes the fluorescent dye through the suspensor. CF could first be detected throughout the suspensor cell and then subsequently in the embryo proper. A plasmolysis experiment clearly indicates that suspensor cells have a more negative osmotic potential than the adjoining testa cells. It is proposed that the preferential entry of CFDA into the suspensor cell of the Nun orchid is aided by the more negative osmotic potential of the suspensor than neighboring cells, providing a driving force for the uptake of water from the apoplast into the symplast.
Authors:
Yung-I Lee; Edward C Yeung
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Publication Detail:
Type:  Journal Article     Date:  2010-05-14
Journal Detail:
Title:  Sexual plant reproduction     Volume:  23     ISSN:  1432-2145     ISO Abbreviation:  Sex. Plant Reprod.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955730     Medline TA:  Sex Plant Reprod     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  337-41     Citation Subset:  IM    
Affiliation:
Botany Department, National Museum of Natural Science, 404 Taichung, Taiwan, ROC. leeyungi@mail.nmns.edu.tw
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