494 / 2019-02-28 15:44:11

Way to grow in the crowd

shade avoidance response

全体主题 > Photobiology

To compete with their neighbors for light and escape shaded environment, sun-loving plants have developed shade avoidance syndrome (SAS) to alter plant architecture and initiate the early flowering and seed set. In Arabidopsis, the shade-induced de-phosphorylation of the transcription
factor PIF7 (PHYTOCHROME-INTERACTING FACTOR 7) is the key event linking light perception to
shade response. However, the mechanism through the activity of PIF7 is unclear. We found that PIF7 recruits the H3K4me3/H3K36me3-reader protein MRGs to promote histone acetylations in activating genes to promote stem elongation. And 14-3-3s mediates the retention of PIF7 in the cytoplasm to suppresses the shade-induced hypocotyl elongation. Besides the role of PIF7 in seedling stage, PIF7 also play the role in shade-induced accelebration of flowering time. These regulations establish a crucial link of the light signal with genetic network to regulate shade avoidance response.