RCB initiates Arabidopsis thermomorphogenesis by stabilizing the thermoregulator PIF4 in the daytime

Authors

Yongjian Qiu, University of California, Riverside
Elise K. Pasoreck, University of California, Riverside
Chan Yul Yoo, University of California, Riverside
Jiangman He, University of California, Riverside
He Wang, University of California, Riverside
Abhishesh Bajracharya, University of Mississippi
Meina Li, University of California, Riverside
Haley D. Larsen, University of California, Riverside
Stacey Cheung, University of California, Riverside
Meng Chen, University of California, Riverside

Document Type

Article

Publication Date

12-1-2021

Abstract

Daytime warm temperature elicits thermomorphogenesis in Arabidopsis by stabilizing the central thermoregulator PHYTOCHROME INTERACTING transcription FACTOR 4 (PIF4), whose degradation is otherwise promoted by the photoreceptor and thermosensor phytochrome B. PIF4 stabilization in the light requires a transcriptional activator, HEMERA (HMR), and is abrogated when HMR’s transactivation activity is impaired in hmr-22. Here, we report the identification of a hmr-22 suppressor mutant, rcb-101, which surprisingly carries an A275V mutation in REGULATOR OF CHLOROPLAST BIOGENESIS (RCB). rcb-101/hmr-22 restores thermoresponsive PIF4 accumulation and reverts the defects of hmr-22 in chloroplast biogenesis and photomorphogenesis. Strikingly, similar to hmr, the null rcb-10 mutant impedes PIF4 accumulation and thereby loses the warm-temperature response. rcb-101 rescues hmr-22 in an allele-specific manner. Consistently, RCB interacts directly with HMR. Together, these results unveil RCB as a novel temperature signaling component that functions collaboratively with HMR to initiate thermomorphogenesis by selectively stabilizing PIF4 in the daytime.

Relational Format

journal article

Recommended Citation

Qiu, Y., Pasoreck, E. K., Yoo, C. Y., He, J., Wang, H., Bajracharya, A., Li, M., Larsen, H. D., Cheung, S., & Chen, M. (2021). RCB initiates Arabidopsis thermomorphogenesis by stabilizing the thermoregulator PIF4 in the daytime. Nature Communications, 12(1), 2042. https://doi.org/10.1038/s41467-021-22313-x

DOI

10.1038/s41467-021-22313-x

Accessibility Status

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