ISHS Acta Horticulturae 134: Regulation of Growth and Endogenous Hormones, XXI IHC
THE ROLE OF CYTOKININS AND GIBBERELLINS IN CONTROLLING INFLORESCENCE DEVELOPMENT IN TOMATO |
| Authors: | J.M. Kinet, M. Léonard |
| Abstract:
By appropriate manipulations of the light conditions, it is possible to induce the abortion of tomato inflorescences at different developmental stages. Exogenous applications of cytokinins and gibberellins may prevent the failure of the flower truss, but the effectiveness of these growth regulators is dependent on the stage reached by the aborting inflorescence. When failure occurs at a late stage, gibberellins are more effective than cytokinins in promoting inflorescence development. Abortion at an early stage is partially counteracted by cytokinins only, but complete development to flower opening requires gibberellin after cytokinin action. Inflorescences which abort early suffer a severe cytokinin deficiency while their content in gibberellins is high in comparison to levels in inflorescences that develop normally. These results suggest that cytokinins play a major role in the control of early reproductive development in tomato and that gibberellins are involved in later stages of inflorescence development. | |
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