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Background  The  Arabidopsis   FILAMENTOUS FLOWER (FIL)  gene encodes a YABBY (YAB) family putative transcription factor that has been implicated in specifying abaxial cell identities and thus regulating organ polarity of lateral organs. In contrast to double mutants of  fil  and other  YAB  genes,  fil  single mutants display mainly floral and inflorescence morphological defects that do not reflect merely a loss of abaxial identity. Recently,  FIL  and other  YABs  have been shown to regulate meristem organization in a non-cell-autonomous manner. In a screen for new mutations affecting floral organ morphology and development, we have identified a novel allele of FIL,  fil-9  and characterized its floral and meristem phenotypes.    Results  The  fil-9  mutation results in highly variable disruptions in floral organ numbers and size, partial homeotic transformations, and in defective inflorescence organization. Examination of meristems indicates that both  fil-9  inflorescence and floral meristems are enlarged as a result of an increase in cell number, and deformed. Furthermore, primordia emergence from these meristems is disrupted such that several primordia arise simultaneously instead of sequentially. Many of the organs produced by the inflorescence meristems are filamentous, yet they are not considered by the plant as flowers. The severity of both floral organs and meristem phenotypes is increased acropetally and in higher growth temperature.    Conclusions  Detailed analysis following the development of  fil-9  inflorescence and flowers throughout flower development enabled the drawing of a causal link between multiple traits of  fil-9  phenotypes. The study reinforces the suggested role of  FIL  in meristem organization. The loss of spatial and temporal organization of  fil-9  inflorescence and floral meristems presumably leads to disrupted cell allocation to developing floral organs and to a blurring of organ whorl boundaries. This disruption is reflected in morphological and organ identity aberrations of  fil-9  floral organs and in the production of filamentous organs that are not perceived as flowers. Here, we show the role of  FIL  in reproductive meristem development and emphasize the potential of using  fil  mutants to study mersitem organization and the related effects on flower morphogenesis.

A novel allele of FILAMENTOUS FLOWER reveals new insights on the link between inflorescence and floral meristem organization and flower morphogenesis