Genetic and spatial interactions betweenFT,TSFandSVPduring the early stages of floral induction in Arabidopsis

• DOI: 10.1111/j.1365-313x.2009.03986.x
• Publication Date: 2009-07-25T13:07:43Z
• Authors: Seonghoe Jang; Stefano Torti; George Coupland
• Keywords: 0301 basic medicine; DNA, Plant; Arabidopsis Proteins; Meristem; Arabidopsis; Gene Expression Regulation, Developmental; MADS Domain Proteins; Phosphatidylethanolamine Binding Protein; Flowers; 03 medical and health sciences; Gene Expression Regulation, Plant; Mutation; Promoter Regions, Genetic; Signal Transduction; Transcription Factors

Summary Flowering is controlled by a network of pathways that converge to regulate small number floral integrator genes. We studied the interactions in Arabidopsis between three these integrators, FLOWERING LOCUS T ( FT ), TWIN SISTER OF TSF ) and SUPPRESSOR OVEREXPRESSION CONSTANS 1 SOC1 as well their repression MADS box transcription factor SHORT VEGETATIVE PHASE (SVP). mobile signal transmitted from leaf meristem initiate flowering. Using mRNA null alleles, we show closely related are not essential for flowering, but double mutant photoperiod‐insensitive. Inactivation both genes also fully suppresses early‐flowering phenotype caused over‐expression (CO), transcriptional regulator photoperiod pathway. In addition, demonstrate have similar biochemical functions showing they interact yeast with same bZIP factors. Expression or promoters specific phloem companion cells drives early flowering mutant, so no expression either gene required meristem. Furthermore, , like repressed SVP, triple svp‐41 ft‐10 tsf‐1 expresses sooner flowers earlier than . Thus distinguish SVP repressing time course situ hybridizations suggested activation proceed simultaneously These observations clarify relationships regulators transition, further emphasize relatedness mechanisms acting control time.