Hormone Signals from Roots to Shoots of Sunflower (Helianthus annuus L.). Moderate Soil Drying Increases Delivery of Abscisic Acid and Depresses Delivery of Cytokinins in Xylem Sap |
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| Authors: | SHASHIDHAR V R; PRASAD T G; SUDHARSHAN L |
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| Institution: | Departments of Crop Physiology and Biochemistry, University of Agricultural Sciences GKVK, Bangalore-560 065, India |
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| Abstract: | We quantified abscisic acid and a cytokinin trans zeatin ribosideas potential positive or negative signals in root to shoot communicationin sunflower plants (Helianthus annuus L.) growing in dryingsoil. Delivery rates rather than concentration values were usedbecause the former are less subject to change as a result ofdifferences in sap flow through dilution. ABA concentrationand delivery rate increased under the mild drought stress. Incontrast, t-ZR concentration did not change under mild stressalthough delivery rates decreased significantly. With more severedrought stress, both delivery rates and concentration of t-ZRdecreased considerably while ABA concentration and deliverywere enhanced markedly. Root ABA contents mirrored those ofxylem ABA. Helianthus annuus ; soil drying; root signals; ABA; cytokinins; delivery rate; delivery rate |
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