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<p>Stomatal pores serve as primary entry points for pathogen invasion. Stomatal closure is a crucial strategy that plants employ to counter pathogen attack. Here, we report that F‐BOX STRESS‐INDUCED (FBS) is essential for modulating stomatal closure, thereby enhancing resistance to bacteria in <i>Arabidopsis thaliana</i>. The <i>fbs2-1 fbs3-1 fbs4-2</i> triple mutant displayed increased susceptibility to <i>Pseudomonas syringae pv. tomato</i> (<i>Pst</i>DC3000) due to impaired stomatal closure. Additionally, FBS4 interacts with and degrades the basic helix-loop-helix (bHLH) transcription factor FAMA. Both the <i>fama-1</i> single mutant plants and the <i>fama-1 fbs2-1 fbs3-1 fbs4-2</i> quadruple mutant plants exhibited resistance to <i>Pst</i>DC3000 inoculation. Furthermore, the expression levels of abscisic acid (ABA)-responsive genes <i>RD29A, RD29B, ABI2,</i> and <i>CIPK25</i> were altered in the <i>fbs2-1 fbs3-1 fbs4-2</i> and <i>fama-1</i> mutant plants. Collectively, our data demonstrate that FBS, in association with FAMA, plays an important role in pathogen invasion by influencing ABA signaling-related stomatal closure.</p>

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The Arabidopsis F-box protein FBS associated with the helix-loop-helix transcription factor FAMA involved in stomatal immunity

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Chunxia Zhang,
  • Junling Yue,
  • Shi Li,
  • Chaoran Zuo,
  • Yi Li,
  • Qixiumei He,
  • Jie Le

摘要

Stomatal pores serve as primary entry points for pathogen invasion. Stomatal closure is a crucial strategy that plants employ to counter pathogen attack. Here, we report that F‐BOX STRESS‐INDUCED (FBS) is essential for modulating stomatal closure, thereby enhancing resistance to bacteria in Arabidopsis thaliana. The fbs2-1 fbs3-1 fbs4-2 triple mutant displayed increased susceptibility to Pseudomonas syringae pv. tomato (PstDC3000) due to impaired stomatal closure. Additionally, FBS4 interacts with and degrades the basic helix-loop-helix (bHLH) transcription factor FAMA. Both the fama-1 single mutant plants and the fama-1 fbs2-1 fbs3-1 fbs4-2 quadruple mutant plants exhibited resistance to PstDC3000 inoculation. Furthermore, the expression levels of abscisic acid (ABA)-responsive genes RD29A, RD29B, ABI2, and CIPK25 were altered in the fbs2-1 fbs3-1 fbs4-2 and fama-1 mutant plants. Collectively, our data demonstrate that FBS, in association with FAMA, plays an important role in pathogen invasion by influencing ABA signaling-related stomatal closure.