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Updated: Jun 1, 2026

Visualizing Cellular Gibberellin Levels Using the nlsGPS1 Förster Resonance Energy Transfer (FRET) Biosensor
Published on: January 12, 2019
Gibberellins negatively regulate low temperature-induced anthocyanin accumulation in a HY5/HYH-dependent manner
Yongqiang Zhang1, Zhongjuan Liu, Rongzhi Liu
1School of Life Sciences, Lanzhou University, Lanzhou Gansu, China.
Abstract:
Low temperature could significantly induce anthocyanin accumulation in the presence of light. Recently, two bZIP transcription factors LONG HYPOCOTYL 5 (HY5) and HOMOLOG OF HY5 (HYH) were identified to play an important role in the process of low temperature-induced anthocyanin accumulation. However, the mechanism by which HY5/HYH regulates anthocyanin accumulation under low temperature still remains unclear. Here, we found that the gibberellins (GAs) could decrease but PAC (endogenous GAs biosynthesis inhibitor) increase the low temperature-induced anthocyanin accumulation, implying that GAs signaling may involve in this process. Furthermore, the transcript levels of GA2ox1, encoding a major member of bioactive GAs-deactivating enzymes, were significantly up-regulated by low temperature in a HY5/HYH-dependent manner. Moreover, hy5hyh mutant was insensitive to PAC in enhancing anthocyanin accumulation under low temperature. From these data we propose that, together with HY5/HYH, GA signaling may play an important role during low temperature-induced anthocyanin accumulation.
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