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MULTIPASS , a rice R2R3‐type MYB transcription factor, regulates adaptive growth by integrating multiple hormonal pathways
Author(s) -
Schmidt Romy,
Schippers Jos H. M.,
Mieulet Delphine,
Obata Toshihiro,
Fernie Alisdair R.,
Guiderdoni Emmanuel,
MuellerRoeber Bernd
Publication year - 2013
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.12286
Subject(s) - abscisic acid , auxin , myb , transcription factor , gibberellin , cytokinin , gene knockdown , microbiology and biotechnology , biology , expansin , arabidopsis , gene , gene expression , biochemistry , botany , mutant
Summary Growth regulation is an important aspect of plant adaptation during environmental perturbations. Here, the role of MULTIPASS (Os MPS ), an R2R3‐type MYB transcription factor of rice, was explored. OsMPS is induced by salt stress and expressed in vegetative and reproductive tissues. Over‐expression of OsMPS reduces growth under non‐stress conditions, while knockdown plants display increased biomass. OsMPS expression is induced by abscisic acid and cytokinin, but is repressed by auxin, gibberellin and brassinolide. Growth retardation caused by OsMPS over‐expression is partially restored by auxin application. Expression profiling revealed that OsMPS negatively regulates the expression of EXPANSIN ( EXP ) 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 Os EXPA 4 , Os EXPA 8 , Os EXPB 2 , Os EXPB 3 , Os EXPB 6 and the endoglucanase genes Os GLU 5 and Os GLU 14 . The multiple responses of Os MPS and its target genes to various hormones suggest an integrative function of Os MPS in the cross‐talk between phytohormones and the environment to regulate adaptive growth.