2025-04-03 中国科学院(CAS)
<関連情報>
- https://english.cas.cn/newsroom/research_news/life/202504/t20250402_909213.shtml
- https://www.cell.com/developmental-cell/fulltext/S1534-5807(25)00154-6
トマトのシュート頂端分裂組織の成熟を遅らせ、熱ストレス耐性を獲得するためのROSバーストによる転写凝縮の延長 ROS burst prolongs transcriptional condensation to slow shoot apical meristem maturation and achieve heat-stress resilience in tomato
Xiaozhen Huang∙ Nan Xiao∙ Yue Xie∙ Cao Xu
Developmental Cell Published:April 2, 2025
DOI:https://doi.org/10.1016/j.devcel.2025.03.007
Graphical abstract
Highlights
•Tomato plants slow shoot meristem maturation to achieve heat-stress resilience
•Heat-induced ROS lengthen vegetative growth to avoid reproductive failure
•ROS burst prolongs transcriptional condensation of TMF to repress floral transition
•Transient phase-wise slow growth may be a bet-hedging strategy for heat resilience
Summary
The transition of the shoot apical meristem (SAM) from vegetative growth to flowering, a key step of angiosperm reproductive success, is highly vulnerable to heat stress. Overproduction of reactive oxygen species (ROS) is a hallmark of such environmental stresses, but how SAM exploits the extra ROS to achieve heat-stress resilience is largely unknown. Here, we report that tomato plants respond to heat-induced ROS burst by slowing down SAM maturation and lengthening the vegetative state to achieve heat resilience. Heat-induced extra ROS prolonged the transcriptional condensation status of TERMINATING FLOWER (TMF), a prion-like transcription repressor that undergoes phase separation by sensing hydrogen peroxide (H2O2), therefore temporarily delaying activation of flowering transition and extending vegetative growth. Loss-of-function of TMF, or base editing of a single cysteine residue that senses H2O2, abolishes heat resilience. Our findings demonstrate that transcriptional reprogramming triggered by ROS might be a molecular basis of plant developmental plasticity underlying heat-stress resilience.
