| Description | This entry represents the basic helix-loop-helix (bHLH) domain found in Arabidopsis thaliana phytochrome interacting factors (PIFs) and similar transcription factors from plants, including ALC, PIL1, SPATULA, and UNE10 [ , ].PIFs (PIF1/3/4/5/6/7) have been shown to control light-regulated gene expression. They directly bind to the photoactivated phytochromes and are degraded in response to light signals [ , , , , , ]. ALC, also termed protein ALCATRAZ, is required for the dehiscence of fruit, especially for the separation of the valve cells from the replum. It promotes the differentiation of a strip of labile non-lignified cells sandwiched between layers of lignified cells [, ]. PIL1 is involved in responses to transient and long-term shade. It is required for the light-mediated inhibition of hypocotyl elongation and necessary for rapid light-induced expression of the photomorphogenesis- and circadian-related gene APRR9. PIL1 seems to play a role in multiple PHYB responses, such as flowering transition and petiole elongation [, ]. SPATULA plays a role in floral organogenesis. It promotes the growth of carpel margins and of pollen tract tissues derived from them []. UNE10 is required during the fertilization of ovules by pollen []. | Name | Transcription factor PIF1-like, basic helix-loop-helix domain |
| Short Name | PIF1-like_bHLH | Type | Domain |
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