Abstract

To fully understand the regulation effects of gibberellin on tomato (Solanum Lycoperscium) ovary locule formation and the fasciated transcription, two varieties: multi-locule ‘MLK1’ and few- locule ‘FL1’ which were highly different in locule number and fasciated transcriptional levels, were used in this study. By spraying GA₃ and PAC (paclobutrazol; an inhibitor of gibberellin biosynthesis) with different concentrations, we found that GA₃ increased the locule number, especially, in ‘MLK1’. At the same time, we chose the suitable treatment concentrations of GA₃ and PAC (GA₃, 80 mg·L^-1, PAC, 80 mg·L^-1) which were applied on the ‘MLK1’ and ‘FL1’ to analyze the fasciated transcriptional levels and we found that GA₃ repressed thefasciated transcriptional level while PAC increased it. The results implied that the GA₃regulated the ovary locule formation through controlling the fasciated transcription levels.

Key words: Tomato, fasciated, GA₃, locule number.