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<p><i>Brassica juncea</i> is highly susceptible to the devastating disease Alternaria leaf spot, caused by <i>Alternaria brassicae</i>, which can reduce mustard yields by 17–38%. Jasmonic acid (JA) is a key signaling molecule that regulates plant defense mechanisms. Depending on the specific phyto-patho system, abscisic acid (ABA) can act as either a positive or negative regulator of plant defense. In Brassica species, the mechanisms of ABA-regulated defense signaling and the variations in these pathways remain unclear. This study aims to understand the role of phytohormone signaling in susceptible <i>B. juncea</i>. Our investigation revealed significant variations in the phytohormone signaling response in susceptible genotypes during the early hours post-treatment. Furthermore, the role of ABA in salicylic acid SA-JA crosstalk varies significantly. In this study, we examined the interaction between JA biosynthesis pathway genes and defense signaling during the initial stages of pathogen invasion. Our findings suggest that the pathogen-induced signaling mechanism during the early stages of infection is closely linked to the JA biosynthesis gene AOC2. Additionally, we discovered that the antagonistic interaction between ABA and JA in Brassica significantly contributes to disease progression and secondary infection.</p>

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An analysis of ABA and JA interaction controlling JA-mediated resistance against Alternaria blight in Indian mustard

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Shikha Dixit,
  • Anita Grover,
  • R. Pandian

摘要

Brassica juncea is highly susceptible to the devastating disease Alternaria leaf spot, caused by Alternaria brassicae, which can reduce mustard yields by 17–38%. Jasmonic acid (JA) is a key signaling molecule that regulates plant defense mechanisms. Depending on the specific phyto-patho system, abscisic acid (ABA) can act as either a positive or negative regulator of plant defense. In Brassica species, the mechanisms of ABA-regulated defense signaling and the variations in these pathways remain unclear. This study aims to understand the role of phytohormone signaling in susceptible B. juncea. Our investigation revealed significant variations in the phytohormone signaling response in susceptible genotypes during the early hours post-treatment. Furthermore, the role of ABA in salicylic acid SA-JA crosstalk varies significantly. In this study, we examined the interaction between JA biosynthesis pathway genes and defense signaling during the initial stages of pathogen invasion. Our findings suggest that the pathogen-induced signaling mechanism during the early stages of infection is closely linked to the JA biosynthesis gene AOC2. Additionally, we discovered that the antagonistic interaction between ABA and JA in Brassica significantly contributes to disease progression and secondary infection.