Document Detail

Role of phi cells and the endodermis under salt stress in Brassica oleracea.
MedLine Citation:
PMID:  19121032     Owner:  NLM     Status:  MEDLINE    
Phi cell layers were discovered in the 19th century in a small number of species, including members of the Brassicaceae family. A mechanical role was first suggested for this structure; however, this has never been demonstrated. The main objective of the present work was to analyse the ultrastructure of phi cells, their influence on ion movement from the cortex to the stele, and their contribution to salt stress tolerance in Brassica oleracea. Transmission electron microscopy and X-ray microanalysis studies were used to analyse the subcellular structure and distribution of ions in phi cells and the endodermis under salt stress. Ion movement was analysed using lanthanum as an apoplastic tracer. The ultrastructural results confirm that phi cells are specialized cells showing cell wall ingrowths in the inner tangential cell walls. X-ray microanalysis confirmed a build-up of sodium. Phi thickenings were lignified and lanthanum moved periplasmically at this level. To the best of our knowledge, this is the first study reporting the possible role of the phi cells as a barrier controlling the movement of ions from the cortex to the stele. Therefore, the phi cell layer and endodermis seem to be regulating ion transport in Brassica oleracea under salt stress.
N Fernandez-Garcia; L Lopez-Perez; M Hernandez; E Olmos
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The New phytologist     Volume:  181     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-05     Completed Date:  2009-02-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  347-60     Citation Subset:  IM    
Department of Stress Biology and Plant Pathology, Centro de Edafología y Biología Aplicada del Segura, PO Box 164, E-30100 Murcia, Spain.
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MeSH Terms
Adenosine Triphosphatases / metabolism
Brassica / cytology,  physiology*
Cell Wall / chemistry
Ion Transport / physiology*
Lanthanum / pharmacology
Lignin / analysis
Lipids / analysis
Plant Roots / cytology,  metabolism*
Plant Stomata
Stress, Physiological*
Reg. No./Substance:
0/Lipids; 7439-91-0/Lanthanum; 8072-95-5/suberin; 9005-53-2/Lignin; EC 3.6.1.-/Adenosine Triphosphatases

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

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