Hironaka Tsukagoshi

Nagoya University

Abstract:

The balance between cellular proliferation and differentiation is a key event for development in multicellular organism. The plant hormones, such as auxin and cytokinin, regulate this event at the root tip. Moreover, the reactive oxygen species (ROS) served important role for regulating the cell fate. We have identified a transcription factor (TF), UPBEAT1 (UPB1), which functioned as a key regulator for keeping the balance between cellular proliferation and differentiation with regulating ROS homeostasis at the root tip. However, we need to find the other root growth regulators under the ROS signal besides UPB1. To address this question, we made transcriptional map (ROS map), which consisted of the time course microarray using the root treated by H2O2. From ROS map, we selected a TF that showed the significant expression changes in 1 hour H2O2 treatment and named it RFRT1. One of the targets of RFRT1 seemed to regulate cell elongation under the ROS signaling, we concluded that RFRT1 was also important TF for the root growth in the ROS signaling. In this symposium, we would like to discuss of how ROS regulates root growth, especially focusing on TFs.