Journal Article

Spatial activity and expression of plasma membrane H<sup>+</sup>-ATPase in stem xylem of walnut during dormancy and growth resumption

Georges Alves, Melanie Decourteix, Pierrette Fleurat-Lessard, Soulaiman Sakr, Marc Bonhomme, Thierry Améglio, Andre Lacointe, Jean-Louis Julien, Gilles Petel and Agnes Guilliot

in Tree Physiology

Volume 27, issue 10, pages 1471-1480
Published in print October 2007 | ISSN: 0829-318X
Published online October 2007 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/27.10.1471
Spatial activity and expression of plasma membrane H+-ATPase in stem xylem of walnut during dormancy and growth resumption

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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.

Keywords: acrotony; apical bud; basal bud; bud break; Juglans regia; PM H+-ATPase; sugar uptake; vessel associated cell; xylem sap

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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