MULTIPASS, a rice R2R3‐type MYB transcription factor, regulates adaptive growth by integrating multiple hormonal pathways. (26th August 2013)

• Record Type: Journal Article
• Authors: Schmidt, Romy; Schippers, Jos H. M.; Mieulet, Delphine; Obata, Toshihiro; Fernie, Alisdair R.; Guiderdoni, Emmanuel; Mueller‐Roeber, Bernd
• Is Part Of: Plant journal. Volume 76:Number 2(2013:Oct.)
• Page Start: 258
• Page End: 273
• Publication Date: 2013-08-26
• Subjects: Plant molecular biology -- Periodicals; Plant cells and tissues -- Periodicals; Botany -- Periodicals; 580
• DOI: 10.1111/tpj.12286
• Languages: English
• ISSNs: 0960-7412

Abstract

<abstract abstract-type="main" id="tpj12286-abs-0001"> <title>Summary</title> <p>Growth regulation is an important aspect of plant adaptation during environmental perturbations. Here, the role of MULTIPASS (OsMPS), an R2R3‐type MYB transcription factor of rice, was explored. <italic>OsMPS</italic> is induced by salt stress and expressed in vegetative and reproductive tissues. Over‐expression of <italic>OsMPS</italic> reduces growth under non‐stress conditions, while knockdown plants display increased biomass. <italic>OsMPS</italic> expression is induced by abscisic acid and cytokinin, but is repressed by auxin, gibberellin and brassinolide. Growth retardation caused by <italic>OsMPS</italic> over‐expression is partially restored by auxin application. Expression profiling revealed that OsMPS negatively regulates the expression of <italic>EXPANSIN</italic> (<italic>EXP</italic>) and cell‐wall biosynthesis as well as phytohormone signaling genes. Furthermore, the expression of OsMPS‐dependent genes is regulated by auxin, cytokinin and abscisic acid. Moreover, we show that OsMPS is a direct upstream regulator of <italic>OsEXPA4</italic>, <italic> OsEXPA8</italic>, <italic> OsEXPB2</italic>, <italic> OsEXPB3</italic>, <italic> OsEXPB6</italic> and the endoglucanase genes <italic>OsGLU5</italic> and <italic>OsGLU14</italic>. The multiple responses of <italic>OsMPS</italic> and its target genes to various hormones suggest an integrative function of OsMPS in the cross‐talk between phytohormones and the environment to regulate adaptive growth.</p> </abstract>