Light-Responsive Transcription Factors Drive Petal Color in Lilies

Researchers from Shenyang Agricultural University have uncovered how light influences petal coloration in lilies through a novel molecular mechanism involving two key transcription factors. Published in Horticulture Research on July 30, 2024, their study reveals that LvBBX24 and LvbZIP44 collaboratively activate the LvMYB5 gene, which is crucial for anthocyanin synthesis—the pigment responsible for the flower's pink and purple hues. The team observed that exposure to light enhances lily petal pigmentation by upregulating genes involved in anthocyanin production. Specifically, LvBBX24 responds rapidly to light, binding directly to the LvMYB5 promoter and facilitating its activation. LvbZIP44, although not directly responsive to light, interacts with LvBBX24 and also promotes LvMYB5 expression. When both factors are active, they synergistically boost pigment synthesis, resulting in more vibrant petal colors. Conversely, silencing either gene diminishes coloration, confirming their cooperative role. This discovery provides valuable insights into the plant's light-responsive gene regulation and offers promising avenues for horticultural advancements. By manipulating these transcripti...