Regulation effects of exogenous gibberellin acid (GA3) on the formation of tomato (Solanum Lycoperscium) ovary locule and fasciated transcription

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 the fasciated transcriptional level while PAC increased it. The results implied that the GA₃ regulated the ovary locule formation through controlling the fasciated transcription levels.

Keywords: Tomato, fasciated, GA3, locule number