An Analysis of the Development of the Graft Union in Lycopersicon esculentum

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Abstract
An examination of the development of the graft union in tomato shows that the breaking weight increases in two phases over a period of 7 days. The first phase lasts for approximately 4 days and is accompanied by an active period of cell division and a large increase in the number of trachcidal elements, the second phase, during which tracheids continue to differentiate but there is no increase in cell number, is of about 3 days' duration. The data presented support the hypothesis that all the dividing cells within the graft union are involved in the formation of a catalytic complex and all synthesise and accumulate polysaccharides and that the change in breaking weight during the first phase is proportional to the amount of polysaccharide deposited in the junction. The final restoration of vascular continuity which takes place towards the end of the first phase and during the second is reflected by the large increase in the number of tracheidal elements within the graft union at that time.

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