Roles ofPIN-FORMED1andMONOPTEROSin pattern formation of the apical region of theArabidopsisembryo

• DOI: 10.1242/dev.129.17.3965
• Publication Date: 2021-04-25T13:15:30Z
• Authors: Mitsuhiro Aida; Teva Vernoux; Masahiko Furutani; Jan Traas; Masao Tasaka
• Keywords: Cotyledon; Primordium; Polar auxin transport; Organogenesis

In dicotyledonous plants, the apical region of embryo shifts from radial to bilateral symmetry as two cotyledon primordia develop on opposite sides shoot meristem. To further elucidate mechanisms regulating this patterning process, we analyzed functions Arabidopsis genes, PIN-FORMED1 (PIN1) and MONOPTEROS (MP), encoding a putative auxin efflux carrier transcription factor thought mediate signaling, respectively. The corresponding mutants show similar defects in patterning, including fusion dissymmetric organ positioning. Both mutations perturb spatial expression patterns CUP-SHAPED COTYLEDON1 (CUC1) CUC2, which are redundantly required for separation meristem formation. During early embryogenesis, both CUC genes affected differently: area CUC1 is expanded while that CUC2 reduced. addition, genetic analysis indicates PIN1 MP activity only slightly by mutations. These results suggest differential regulation MP. Furthermore, suggests SHOOT MERISTEMLESS (STM), another regulator formation, promotes parallel with PIN1. Our model where regulate partially through control gene expression.