Project description:Sun-loving plants have the ability to detect and avoid shading through sensing of both blue and red light wavelengths. Higher plant cryptochromes (CRYs) control how plants modulate growth in response to changes in blue light. For growth under a canopy, where blue light is diminished, CRY1 and CRY2 perceive this change and respond by directly contacting two bHLH transcription factors, PIF4 and PIF5. These factors are also known to be controlled by phytochromes, the red/far-red photoreceptors; however, transcriptome analyses indicate that the gene regulatory programs induced by the different light wavelengths are distinct. Our results indicate that CRYs signal by modulating PIF activity genome-wide, and that these factors integrate binding of different plant photoreceptors to facilitate growth changes under different light conditions. We performed whole-genome chromatin immunoprecipitation with sequencing (ChIP-Seq) analysis on 5 day old Flash-CRY2, PIF4-Flash and PIF5-Flash treated in low blue-light for 16h.
Project description:Total RNA was extracted from samples including 35S::CNT1-NLS-YFP;cry1 and 35S::CNT1-G283E-NLS-YFP;cry1 seedlings grown in continuous blue light and subjected to high throughput sequencing. Previous studies reported that the C-terminal domain of CRY1 regulates hypocotyl elongation and blue light-regulated genes. This study reveals that CNT1 overexpression also regulates blue light-regulated genes, supporting the role of CNT1 in hypocotyl elongation at transcriptomic level. mRNA from blue light-grown CNT1 or CNT1 variant (G283E) overexpressors was sequenced to analyze the genes regulated by CNT1.