Document Detail

Spatial activity and expression of plasma membrane H+-ATPase in stem xylem of walnut during dormancy and growth resumption.
MedLine Citation:
PMID:  17669737     Owner:  NLM     Status:  MEDLINE    
Plasma membrane H+-ATPase (PM H+-ATPase) plays a key role in nutrient transport, stress responses and growth. To evaluate proton motive force differences between apical and basal parts of acrotonic 1-year-old shoots of walnut (Juglans regia L. cv 'Franquette') trees, spatial and seasonal changes in PM H+-ATPase were studied in mature xylem tissues. During both the dormancy and growth resumption periods, and in both the apical and basal parts of the stem, PM H+-ATPase activity showed positive correlations with the amount of immunodetectable protein. In spring, at the time of growth resumption, higher activities and immunoreactivities of PM H+-ATPase were found in the apical part of the stem than in the basal part of the stem. In spring, the decrease in xylem sugar concentration reflected the high sugar uptake rate. Our data suggest that PM H+-ATPase plays a major role in the uptake of carbohydrates from xylem vessels during growth resumption. These results are discussed in the context of the acrotonic tendency of walnut shoots.
Georges Alves; Melanie Decourteix; Pierrette Fleurat-Lessard; Soulaiman Sakr; Marc Bonhomme; Thierry Améglio; Andre Lacointe; Jean-Louis Julien; Gilles Petel; Agnes Guilliot
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Tree physiology     Volume:  27     ISSN:  0829-318X     ISO Abbreviation:  Tree Physiol.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-08-02     Completed Date:  2007-12-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100955338     Medline TA:  Tree Physiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  1471-80     Citation Subset:  IM    
UMR 547-PIAF, site des Cézeaux, Université Blaise Pascal, 24 avenue des Landais, 63177 Aubière cédex, France.
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MeSH Terms
Cell Membrane / enzymology*
Cloning, Molecular
DNA, Complementary
DNA, Plant
Gene Expression Regulation, Plant
Juglans / enzymology*,  genetics
Microscopy, Fluorescence
Plant Stems / enzymology*
Protein Transport
Proton-Translocating ATPases / genetics,  metabolism*
RNA, Messenger / metabolism
RNA, Plant
Xylem / cytology,  enzymology*
Reg. No./Substance:
0/Carbohydrates; 0/DNA, Complementary; 0/DNA, Plant; 0/RNA, Messenger; 0/RNA, Plant; EC ATPases

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