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<p>This study investigates the role of <i>NaLRR-RK4</i> in plant defense against <i>Alternaria alternata</i> in <i>Nicotiana attenuata</i>, focusing on the differential gene expression in wild-type (WT, <i>NaLRR-RK4</i> expressed) and <i>NaLRR-RK4</i>-silenced (RNAi) plants upon inoculation. Transcriptomic sequencing was conducted to analyze the expression of genes in WT and RNAi plants under <i>Alternaria alternata</i> infection and non-infection conditions, aiming to identify the pathways influenced by <i>NaLRR-RK4</i> in conferring resistance to <i>A. alternata</i>. The activation of MAPK signaling in WT plants, including the upregulation of WRKY33, PR1, and ethylene- and ABA-responsive genes, plays a crucial role in enhancing resistance against <i>A. alternata</i>. In contrast, RNAi-treated plants exhibited reduced activation of these genes, highlighting the essential role of <i>NaLRR</i>-<i>RK4</i> in initiating effective defense responses. <i>NaLRR-RK4</i> functions as a key regulator of MAPK signaling, mediating plant defense against <i>A. alternata</i> through the coordinated activation of WRKY33, PR1, and ethylene- and ABA-responsive genes.</p>

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NaLRR-RK4 mediates MAPK signaling to enhance plant defense against Alternaria alternata in Nicotiana attenuata

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Meiwei Zhao,
  • Haoruo Hu,
  • Yingfen Yang,
  • Meiquan Li,
  • Jianjun Xia,
  • Jin Wang,
  • Tao Zhang,
  • Lei Yang,
  • Shichen Li,
  • Zhengxiong Zhao

摘要

This study investigates the role of NaLRR-RK4 in plant defense against Alternaria alternata in Nicotiana attenuata, focusing on the differential gene expression in wild-type (WT, NaLRR-RK4 expressed) and NaLRR-RK4-silenced (RNAi) plants upon inoculation. Transcriptomic sequencing was conducted to analyze the expression of genes in WT and RNAi plants under Alternaria alternata infection and non-infection conditions, aiming to identify the pathways influenced by NaLRR-RK4 in conferring resistance to A. alternata. The activation of MAPK signaling in WT plants, including the upregulation of WRKY33, PR1, and ethylene- and ABA-responsive genes, plays a crucial role in enhancing resistance against A. alternata. In contrast, RNAi-treated plants exhibited reduced activation of these genes, highlighting the essential role of NaLRR-RK4 in initiating effective defense responses. NaLRR-RK4 functions as a key regulator of MAPK signaling, mediating plant defense against A. alternata through the coordinated activation of WRKY33, PR1, and ethylene- and ABA-responsive genes.