title: PHANTASTICA regulates leaf polarity and petiole identity in Medicago truncatula.
abstract: Establishment of proper polarities along the adaxial-abaxial, proximodistal, and medial-lateral axes is a critical step for the expansion of leaves from leaf primordia. It has been shown that the MYB domain protein, asymmetric leaves1/rough sheath2/PHANTASTICA (collectively named ARP) plays an important role in this process. Loss of function of ARP leads to severe leaf polarity defects, such as abaxialized or needle-like leaves. In addition to its role in leaf polarity establishment, we have recently shown that the Medicago truncatula ARP gene, MtPHAN, also plays a role in leaf petiole identity regulation. We show that a mutation of MtPHAN results in petioles acquiring characteristics of the motor organ, pulvinus, including small epidermal cells with extensive cell surface modifications and altered vascular tissue development. Taken together, our results reveal a previously unidentified function of ARP in leaf development.
authors.affiliation: Plant Biology Division; The Samuel Roberts Noble Foundation; Ardmore, OK USA.
authors.forename: Liangfa
authors.initials: L
authors.lastname: Ge
authors.affiliation: Plant Biology Division; The Samuel Roberts Noble Foundation; Ardmore, OK USA.
authors.forename: Rujin
authors.initials: R
authors.lastname: Chen
mesh_terms: D029681:Arabidopsis Proteins; D046913:Medicago truncatula / Q000235:genetics / Q000254:growth & development*; D018515:Plant Leaves / Q000254:growth & development*; D010940:Plant Proteins / Q000502:physiology*; D012097:Repressor Proteins; D014157:Transcription Factors
chemical_list: C456239:ASYMMETRIC LEAVES1 protein, Arabidopsis; D029681:Arabidopsis Proteins; D010940:Plant Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C118404:rough sheath2 protein, Zea mays
keywords: Compound leaf development; ELONGATED PETIOLULE1; Leaf polarity; MYB domain protein; Medicago; PHANTASTICA; Petiole identity; Pulvinus; motor organ