TY  - JOUR
A1  - Lu, Dandan
A1  - Wang, Ting
A1  - Persson, Staffan
A1  - Müller-Röber, Bernd
A1  - Schippers, Jos H. M.
T1  - Transcriptional control of ROS homeostasis by KUODA1 regulates cell expansion during leaf development
JF  - Nature Communications
N2  - The final size of an organism, or of single organs within an organism, depends on an intricate coordination of cell proliferation and cell expansion. Although organism size is of fundamental importance, the molecular and genetic mechanisms that control it remain far from understood. Here we identify a transcription factor, KUODA1 (KUA1), which specifically controls cell expansion during leaf development in Arabidopsis thaliana. We show that KUA1 expression is circadian regulated and depends on an intact clock. Furthermore, KUA1 directly represses the expression of a set of genes encoding for peroxidases that control reactive oxygen species (ROS) homeostasis in the apoplast. Disruption of KUA1 results in increased peroxidase activity and smaller leaf cells. Chemical or genetic interference with the ROS balance or peroxidase activity affects cell size in a manner consistent with the identified KUA1 function. Thus, KUA1 modulates leaf cell expansion and final organ size by controlling ROS homeostasis.
Y1  - 2014
U6  - https://doi.org/10.1038/ncomms4767
SN  - 2041-1723
VL  - 5
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Schmidt, Romy
A1  - Schippers, Jos H. M.
A1  - Mieulet, Delphine
A1  - Watanabe, Mutsumi
A1  - Hoefgen, Rainer
A1  - Guiderdoni, Emmanuel
A1  - Müller-Röber, Bernd
T1  - Salt-Rresponsive ERF1 is a negative regulator of grain filling and gibberellin-mediated seedling establishment in rice
JF  - Molecular plant
N2  - Grain quality is an important agricultural trait that is mainly determined by grain size and composition. Here, we characterize the role of the rice transcription factor (TF) SALT-RESPONSIVE ERF1 (SERF1) during grain development. Through genome-wide expression profiling and chromatin immunoprecipitation, we found that SERF1 directly regulates RICE PROLAMIN-BOX BINDING FACTOR (RPBF), a TF that functions as a positive regulator of grain filling. Loss of SERF1 enhances RPBF expression resulting in larger grains with increased starch content, while SERF1 overexpression represses RPBF resulting in smaller grains. Consistently, during grain filling, starch biosynthesis genes such as GRANULE-BOUND STARCH SYNTHASEI (GBSSI), STARCH SYNTHASEI (SSI), SSIIIa, and ADP-GLUCOSE PYROPHOSPHORYLASE LARGE SUBUNIT2 (AGPL2) are up-regulated in SERF1 knockout grains. Moreover, SERF1 is a direct upstream regulator of GBSSI. In addition, SERF1 negatively regulates germination by controlling RPBF expression, which mediates the gibberellic acid (GA)-induced expression of RICE AMYLASE1A (RAmy1A). Loss of SERF1 results in more rapid seedling establishment, while SERF1 overexpression has the opposite effect. Our study reveals that SERF1 represents a negative regulator of grain filling and seedling establishment by timing the expression of RPBF.
KW  - RPBF
KW  - rice
KW  - grain filling
KW  - germination
KW  - SERF1
KW  - gibberellic acid
Y1  - 2014
U6  - https://doi.org/10.1093/mp/sst131
SN  - 1674-2052
SN  - 1752-9867
VL  - 7
IS  - 2
SP  - 404
EP  - 421
PB  - Oxford Univ. Press
CY  - Oxford
ER  -