Accepted_test

Despite the detailed study of AP1 gene composition and its expression patterns, there are still questions related to its function. In AP1 mutants, not only the perianth is transformed, but the whole structure of the flower and inflorescence, which cannot be explained by the action of a local gene. This work focuses on analysing phenotypic effects in ap1-1 mutants of A. thaliana in order to clarify the function of the gene AP1. The formation of bracts in inflorescences of ap1-1 mutants of A. thaliana indicates that their development shifts from the embryonic stage to later stages of morphogenesis. In ap1-1 the development of bract is shifted to later stages of morphogenesis. This initiates the shift of the timing of development at flower organ. Consequently, the ap1-1 mutation of A. thaliana is heterochronic. The flowers and bracts in the inflorescence represent a single transformation series. Apparently, one of the functions of the AP1 gene is the regulation of morphogenesis of elements within the inflorescence. Given the spectrum of changes caused by the ap1-1 mutation, it can be assumed that the AP1 gene is responsible for the separation of elements within the flower and within the inflorescence.