Effect of Abscisic Acid on Growth Correlation in Vitis Vinifera L.

The inflorescences of woody grape vine cuttings usually atrophy if bud burst precedes emergence of adventitious roots (Mullins 1967). Roots are a site of cytokinin synthesis (Kende 1964; Itai and Vaadia 1965), and the ascending sap of vines is rich in endogenous cytokinin (Loeffler and Van Over beek 1964; Nitsch and Nitsch 1965; Skene and Kerridge 1967). The inflorescences of vine cuttings are retained and continue to grow if roots are initiated before bud burst, and the inflorescences of non-rooted cuttings are retained when treated with synthetic cytokinins (Mullins 1967).