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<p>Phytohormones have pleotropic roles in modulating growth, development and immunity. Previously it was reported that the rice (<i>Oryza sativa</i> L.) cell-surface immune receptor XA21 confers resistance at seedling stages to <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> (<i>Xoo</i>) at 27 °C. When introduced into rice through transgenic approaches, XA21 can also influence grain set. Here, it is shown that treatment of XA21 seedlings with jasmonic acid (JA) or abscisic acid (ABA) compromises XA21-mediated resistance to <i>Xoo</i>, but the steady state levels of XA21 protein are not significantly altered. In contrast, exogenous application of five other phytohormones, including brassinolide (BR), cytokinin (CTK), gibberellic acid (GA), indole-3-acetic acid (IAA), and salicylic acid (SA), have little impact on XA21-mediated immunity. These results suggest that there may be interplay between XA21-controlled immunity and ABA/JA-mediated hormone signaling in rice.</p>

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Jasmonic acid and abscisic acid compromise XA21-mediated immunity in rice to Xanthomonas oryzae pv. oryzae

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Qiang Chen,
  • Xiuhua Chen,
  • Wen-Yuan Song

摘要

Phytohormones have pleotropic roles in modulating growth, development and immunity. Previously it was reported that the rice (Oryza sativa L.) cell-surface immune receptor XA21 confers resistance at seedling stages to Xanthomonas oryzae pv. oryzae (Xoo) at 27 °C. When introduced into rice through transgenic approaches, XA21 can also influence grain set. Here, it is shown that treatment of XA21 seedlings with jasmonic acid (JA) or abscisic acid (ABA) compromises XA21-mediated resistance to Xoo, but the steady state levels of XA21 protein are not significantly altered. In contrast, exogenous application of five other phytohormones, including brassinolide (BR), cytokinin (CTK), gibberellic acid (GA), indole-3-acetic acid (IAA), and salicylic acid (SA), have little impact on XA21-mediated immunity. These results suggest that there may be interplay between XA21-controlled immunity and ABA/JA-mediated hormone signaling in rice.