Purpose: Gibberellins (GA3) are plant hormones that regulate seed germination, vegetative growth and reproductive development of plant during its entire life cycle by degrading DELLA proteins. Here, we studied six cultivars of winter oilseed rape, namely Fu-You 4, Luo-Jing, Mei-Jian, S-205, Xin-yang 7833, and Y-135, to examine the effects of exogenous gibberellins on inflorescence development time, morphology of floral organs, expression pattern of putative homeotic genes and GA-responsive genes.\nMethodology: The shift in flowering time varied from 0.6 to 2.6 days among the 6 winter rapeseed cultivars, however, some cultivars did not show significant differences and others were different significantly in flowering time such as Xinyang 7833, S-205, Mei-Jian and Fu-You 4. The exogenous GA3 (50μM) contributed to the regulation of flower opening, stamen filament elongation and filament epidermis cell elongation. Further, we studied the respective relative GA-responsive gene transcript levels in different tissues after exogenous GA3 application. \nResults: The results demonstrated, exogenous GA3 regulated the expression of some floral homeotic genes (BnAG1, BnAP3, and BnPI3) and some GA-responsive genes that caused abnormalities in the floral organs throughout later flower development stages. These results will be helpful for the basic knowledge to clarify signaling roles of GA3 in inductive pathways of flowering in oilseed production.

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