The Role of Light Signal Chain in the Development of Tomato Lateral Branches
Published:17 Apr.2023 Source:BioArt
The team from Zhejiang University published a research paper on tomato plant type online at PNAS entitled “HY5 functions as a systemic signal by integrating BRC1-dependent hormone signaling in tomato bud outgrowth, revealing the role of light signaling chains in tomato lateral branch development.
This study found that the inactivation or deletion of the red-light receptor PHYB and the deletion of the blue-light receptor CRY1a both lead to a decrease in HY5 protein accumulation and an increase in BRC1 transcription level in lateral buds, inhibiting the growth of tomato lateral branches. The study also identified downstream target genes of BRC1, which directly inhibit the transcription of CK synthesis gene LOG4 in lateral buds and activate the transcription levels of CK and GA degradation genes (CKX7, GA2ox4 and GA2ox5), affecting the accumulation of CK and GA, leading to inhibition of lateral bud growth.
The research not only reveals the role of plant light signals in lateral branch development, but also provides scientific basis for optimizing plant type and improving crop yield and quality through light environment regulation.