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<p>DELLA proteins are plant-specific transcription regulators involved in growth, development, and stress responses. However, their functional roles in <i>Fragaria</i> x <i>ananassa</i> remain largely unexplored. This study conducted a genome-wide analysis of the <i>FaDELLA</i> gene family, focusing on phylogenetic classification, gene structure, <i>cis</i>-regulatory elements, chromosomal distribution, and expression profiles under biotic stress. Eight <i>FaDELLA</i> genes were identidied and grouped into two distinct clades, suggesting functional divergence. Promoter and motif analyses revealed their involvement in hormone signal in and stress-related pathways. Among them, <i>FaRGA4</i> was highly responsive to <i>Podosphaera aphanis</i> infection and contained multiple salicylic acid (SA)-responsive <i>cis</i>-elements. Expression profiling and gene network analysis indicated that FaRGA4 may regulate SA-mediated defense by interacting with key components such as FaEDS1 and NPR3-like proteins. These interactions suggest a role in modulating growth-defense trade-offs under pathogen stress. Overall, our findings provide insight into the specialized roles of DELLA proteins in strawberry immunity and highlight <i>FaRGA4</i> as a potential target for developing disease-resistant cultivars.</p>

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Genome-wide analysis of the Fragaria x ananassa DELLA gene family and transcriptome-wide identification of key DELLA responding to biotic stresses

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Jun Feng,
  • Wanzhuang Ma,
  • Yiru Zhang,
  • Xiuli Tang

摘要

DELLA proteins are plant-specific transcription regulators involved in growth, development, and stress responses. However, their functional roles in Fragaria x ananassa remain largely unexplored. This study conducted a genome-wide analysis of the FaDELLA gene family, focusing on phylogenetic classification, gene structure, cis-regulatory elements, chromosomal distribution, and expression profiles under biotic stress. Eight FaDELLA genes were identidied and grouped into two distinct clades, suggesting functional divergence. Promoter and motif analyses revealed their involvement in hormone signal in and stress-related pathways. Among them, FaRGA4 was highly responsive to Podosphaera aphanis infection and contained multiple salicylic acid (SA)-responsive cis-elements. Expression profiling and gene network analysis indicated that FaRGA4 may regulate SA-mediated defense by interacting with key components such as FaEDS1 and NPR3-like proteins. These interactions suggest a role in modulating growth-defense trade-offs under pathogen stress. Overall, our findings provide insight into the specialized roles of DELLA proteins in strawberry immunity and highlight FaRGA4 as a potential target for developing disease-resistant cultivars.