TY  - JOUR
A1  - Schmidt, Romy
A1  - Mieulet, Delphine
A1  - Hubberten, Hans-Michael
A1  - Obata, Toshihiro
A1  - Höfgen, Rainer
A1  - Fernie, Alisdair R.
A1  - Fisahn, Joachim
A1  - Segundo, Blanca San
A1  - Guiderdoni, Emmanuel
A1  - Schippers, Jos H. M.
A1  - Müller-Röber, Bernd
T1  - Salt-responsive ERF1 regulates reactive oxygen species-dependent signaling during the initial response to salt stress in rice
JF  - The plant cell
N2  - Early detection of salt stress is vital for plant survival and growth. Still, the molecular processes controlling early salt stress perception and signaling are not fully understood. Here, we identified SALT-RESPONSIVE ERF1 (SERF1), a rice (Oryza sativa) transcription factor (TF) gene that shows a root-specific induction upon salt and hydrogen peroxide (H2O2) treatment. Loss of SERF1 impairs the salt-inducible expression of genes encoding members of a mitogen-activated protein kinase (MAPK) cascade and salt tolerance-mediating TFs. Furthermore, we show that SERF1-dependent genes are H2O2 responsive and demonstrate that SERF1 binds to the promoters of MAPK KINASE KINASE6 (MAP3K6), MAPK5, DEHYDRATION-RESPONSIVE ELEMENT BINDING2A (DREB2A), and ZINC FINGER PROTEIN179 (ZFP179) in vitro and in vivo. SERF1 also directly induces its own gene expression. In addition, SERF1 is a phosphorylation target of MAPK5, resulting in enhanced transcriptional activity of SERF1 toward its direct target genes. In agreement, plants deficient for SERF1 are more sensitive to salt stress compared with the wild type, while constitutive overexpression of SERF1 improves salinity tolerance. We propose that SERF1 amplifies the reactive oxygen species-activated MAPK cascade signal during the initial phase of salt stress and translates the salt-induced signal into an appropriate expressional response resulting in salt tolerance.
Y1  - 2013
U6  - https://doi.org/10.1105/tpc.113.113068
SN  - 1040-4651
VL  - 25
IS  - 6
SP  - 2115
EP  - 2131
PB  - American Society of Plant Physiologists
CY  - Rockville
ER  - 
TY  - JOUR
A1  - Schmidt, Romy
A1  - Schippers, Jos H. M.
A1  - Mieulet, Delphine
A1  - Obata, Toshihiro
A1  - Fernie, Alisdair R.
A1  - Guiderdoni, Emmanuel
A1  - Müller-Röber, Bernd
T1  - Multipass, a rice R2R3-type MYB transcription factor, regulates adaptive growth by integrating multiple hormonal pathways
JF  - The plant journal
N2  - 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. 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 OsEXPA4, OsEXPA8, OsEXPB2, OsEXPB3, OsEXPB6 and the endoglucanase genes OsGLU5 and OsGLU14. The multiple responses of OsMPS 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.
KW  - development
KW  - expansin
KW  - transcription
KW  - Oryza sativa
KW  - hormone
KW  - abiotic stress
Y1  - 2013
U6  - https://doi.org/10.1111/tpj.12286
SN  - 0960-7412
SN  - 1365-313X
VL  - 76
IS  - 2
SP  - 258
EP  - 273
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -