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Tomato is one of the most widely cultivated vegetable crops and a model for studying fruit biology. Although several genes involved in the traits of fruit quality, development and size have been identified, little is known about the regulatory genes controlling its growth. In this study, we characterized the role of the tomato  SlCDF4  gene in fruit development, a cycling DOF-type transcription factor highly expressed in fruits. The targeted overexpression of  SlCDF4  gene in the fruit induced an increased yield based on a higher amount of both water and dry matter accumulated in the fruits. Accordingly ,  transcript levels of genes involved in water transport and cell division and expansion during the fruit enlargement phase also increased. Furthermore, the larger amount of biomass partitioned to the fruit relied on the greater sink strength of the fruits induced by the increased activity of sucrose-metabolising enzymes. Additionally, our results suggest a positive role of SlCDF4 in the gibberellin-signalling pathway through the modulation of GA 4  biosynthesis. Finally, the overexpression of  SlCDF4  also promoted changes in the profile of carbon and nitrogen compounds related to fruit quality. Overall, our results unveil SlCDF4 as a new key factor controlling tomato size and composition.

The targeted overexpression of SlCDF4 in the fruit enhances tomato size and yield involving gibberellin signalling