Two B-Box Domain Proteins, BBX18 and BBX23, Interact with ELF3 and Regulate Thermomorphogenesis in Arabidopsis

• DOI: 10.1016/j.celrep.2018.10.060
• Publication Date: 2018-11-13T10:44:23Z
• Authors: Lan Ding; Shuo Wang; Ze-Ting Song; Yupei Jiang; Jia-Jia Han; Sun-Jie Lu; Lin Li; Jian-Xiang Liu
• Keywords: Phytochrome

Plants coordinate their growth and developmental programs with various endogenous signals environmental challenges. Phytochrome interacting factor 4 (PIF4) plays a critical positive role in thermoresponsive gene expression hypocotyl Arabidopsis, whereas early flowering 3 (ELF3) negatively regulates the activity of PIF4 at elevated temperatures. However, it is unknown how ELF3 regulated warm Here, we report identification B-box 18 (BBX18) BBX23 as important thermomorphogenesis regulators Arabidopsis. BBX18 mutations result reduced elongation. In contrast, overexpression promotes temperatures, which depends on either or constitutive photomorphogenic 1 (COP1). interact COP1. Knocking out increases abundance under normal temperature conditions. The multiple genes impaired both mutant BBX18/BBX23 double mutant. Thus, our findings reveal an proteins during provide insights into understanding regulate PIF4-dependent genes.