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Annals of Botany 78: 151-155, 1996
© 1996 Annals of Botany Company

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

V. R. SHASHIDHAR+, T. G. PRASAD and L. SUDHARSHAN

Departments of Crop Physiology and Biochemistry, University of Agricultural Sciences GKVK, Bangalore-560 065, India

October 4, 1995 ; January 15, 1996

We quantified abscisic acid and a cytokinin trans zeatin riboside as potential positive or negative signals in root to shoot communication in sunflower plants (Helianthus annuus L.) growing in drying soil. Delivery rates rather than concentration values were used because the former are less subject to change as a result of differences in sap flow through dilution. ABA concentration and delivery rate increased under the mild drought stress. In contrast, t-ZR concentration did not change under mild stress although delivery rates decreased significantly. With more severe drought stress, both delivery rates and concentration of t-ZR decreased considerably while ABA concentration and delivery were enhanced markedly. Root ABA contents mirrored those of xylem ABA.

Helianthus annuus ; soil drying; root signals; ABA; cytokinins; delivery rate; delivery rate


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