4.7 Article

BBX24 Interacts with DELLA to Regulate UV-B-Induced Photomorphogenesis in Arabidopsis thaliana

Journal

Publisher

MDPI
DOI: 10.3390/ijms23137386

Keywords

UV-B; DELLA; gibberellins (GA); BBX24; photomorphogenesis; Arabidopsis thaliana; hypocotyl inhibition

Funding

  1. National Natural Science Foundation of China [31670266]
  2. Natural Science Foundation of Guangdong Province [2017A030313115, 2021A1515010426]
  3. Science and Technology Program of Guangzhou, Guangdong, China [202201010723]

Ask authors/readers for more resources

This study investigates the crosstalk between GA and UV-B signaling pathways in UV-B-induced photomorphogenesis. It is found that DELLA acts as a positive regulator in UV-B-induced photomorphogenesis. Additionally, the HY5-BBX24-DELLA module is identified as an important signal regulating network.
UV-B radiation, sensed by the photoreceptor UVR8, induces signal transduction for plant photomorphogenesis. UV-B radiation affects the concentration of the endogenous plant hormone gibberellin (GA), which in turn triggers DELLA protein degradation through the 26S proteasome pathway. DELLA is a negative regulator in GA signaling, partially relieving the inhibition of hypocotyl growth induced by UV-B in Arabidopsis thaliana. However, GAs do usually not work independently but integrate in complex networks linking to other plant hormones and responses to external environmental signals. Until now, our understanding of the regulatory network underlying GA-involved UV-B photomorphogenesis had remained elusive. In the present research, we investigate the crosstalk between the GA and UV-B signaling pathways in UV-B-induced photomorphogenesis of Arabidopsis thaliana. Compared with wild type Landsberg erecta (Ler), the abundance of HY5, CHS, FLS, and UF3GT were found to be down-regulated in rga-24 and gai-t6 mutants under UV-B radiation, indicating that DELLA is a positive regulator in UV-B-induced photomorphogenesis. Our results indicate that BBX24 interacts with RGA (one of the functional DELLA family members). Furthermore, we also found that RGA interacts with HY5 (the master regulator in plant photomorphogenesis). Collectively, our findings suggest that the HY5-BBX24-DELLA module serves as an important signal regulating network, in which GA is involved in UV-B signaling to regulate hypocotyl inhibition.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available