University of Khartoum

Influence Of Growth Substances On Growth, Flowering And Fruiting Of Tomato

Influence Of Growth Substances On Growth, Flowering And Fruiting Of Tomato

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Title: Influence Of Growth Substances On Growth, Flowering And Fruiting Of Tomato
Author: Mohamed, Sayadat EL Tigani
Abstract: The aim of this study was to investigate the effects of growth substances on growth and yield of tomato as a new crop in the Sudan. Studies were also carried out to investigate the mechanism of the effect of N-dimethylaminosuccinamic acid (B-995) on the vegetative development of tomato. The first part involved the exogenous application of a number of growth substances either alone or in combination to tomato plants in field and pots. The results obtained showed that the responses of growth, flowering and fruiting of tomato were dependent on the concentration of the chemical, frequency of application, age of the plant when treated and/or harvested and on an interaction with environmental conditions. Thus, all the measured criteria of growth, flowering and fruiting either remained unchanged, accelerated or suppressed as compared with the control. The best time for growing tomato was found to lie in the period September to February and the application of growth substances has shown much promise to tomato crop production in the Sudan. The observed growth responses most probably have been a consequence to the alteration in the effective concentration of the various growth substances which seem all to be involved in the regulation of growth of plants. Also the mechanism by which the applied growth substances alter the state of flowering and fruiting can be tentatively explained as relating to the relative expression of the endogenous hormones and florigens. This explanation is supported by the changes in the indole compounds in young flower buds and developing fruits. The data of experiments in part II of this investigation showed that B-995, particularly in high concentrations, induced marked modifications in the vegetative development of tomato. This modification was either partially or completely nullified by GA3, IAA and NAA. This was taken as evidence of B-995 with gibberellin and auxin metabolism and further studies in this part revealed such an influence. Thus, the present disturbed gilbberallin auxin balance might be the most appropriate explanation for the suppression of growth in tomato.
Description: 153page
URI: http://khartoumspace.uofk.edu/handle/123456789/14352
Date: 2015-06-23


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