晨间信号Morning Signal
《科学》 第391卷 第6789期 · 2026年3月5日 · 中文解读

TERMINAL FLOWER1与LEAFY之间的负反馈回路保护花序的不确定性

A negative feedback loop between TERMINAL FLOWER1 and LEAFY protects inflorescence indeterminacy
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这篇讲什么
本文通过建模和实验揭示,在拟南芥中,LEAFY直接上调TERMINAL FLOWER1的表达,而TFL1又反馈抑制LFY,形成负反馈回路,从而缓冲环境信号,维持花序分生组织的不确定性。
原文开头
Tian Huang1, Charles Hodgens2†, Sandhan Prakash1†, Marco Marconi3, Krzysztof Wabnik3,4, Rosangela Sozzani2*, Doris Wagner1* Inflorescences of flowering plants adopt diverse genetically programmed and environmentally tuned architectures. By contrast, continued maintenance of the stem cell pool within the apical meristem is unresponsive to environmental cues. Through a combination of modeling and experimentation in Arabidopsis, we reveal a negative feedback loop that buffers environmental signals. This loop comprises the determinacy- promoting pioneer transcription factor LEAFY (LFY) and the indeterminacy-promoting transcriptional corepressor TERMINAL FLOWER1 (TFL1). At the transition to the flower- producing reproductive phase, LFY directly and quantitatively up-regulates expression of TFL1. TFL1 in turn negatively feeds back on LFY to prevent LFY overaccumulation. …
摘自《科学》(Science)第391卷 第6789期 · 2026年3月5日。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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