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<p>Plants produce an array of secondary metabolites (SMs) to cope with diverse environmental and pathogenic challenges. <i>Brassica</i> crops have evolved to accumulate varied types of SMs, some of which are exclusive to them, such as glucosinolates and their various degradation products (thiocyanates, isothiocyanates, nitriles, epithionitriles, oxazolidinethiones), as well as phenolics, tannins, cyanogenic glycosides, and alkaloids. These SMs play a critical role in resistance against pathogens and herbivores, thereby enhancing plant resilience to biotic stresses. The biosynthetic pathways of these SMs have been targeted to develop disease-resistant varieties using molecular, transgenic, and genome-editing technologies. The regulatory roles of different transcription factors, such as MYCs, MYBs, ERF, WRKYs, and NAC, in the biosynthesis of SMs and disease tolerance have been revealed. Phytohormones such as jasmonic acid, salicylic acid, and brassinosteroids activate regulatory transcription factors and stimulate key enzymes involved in SM pathways. The information and analysis in the present review could be used to modulate SM synthesis in <i>Brassica</i> crops to generate more palatable, nutritious, and stress-tolerant varieties. Such efforts would increase crop yields and also reduce the use of harmful agrochemicals, contributing to a more sustainable agricultural ecosystem.</p>

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Exploring the functional roles of secondary metabolites in Brassica defense networks

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Neha Singh,
  • Shubhra Barwa,
  • Neelam Prabha Negi,
  • Geeta Prakash,
  • Khushbu Lamba,
  • Anjana Rustagi

摘要

Plants produce an array of secondary metabolites (SMs) to cope with diverse environmental and pathogenic challenges. Brassica crops have evolved to accumulate varied types of SMs, some of which are exclusive to them, such as glucosinolates and their various degradation products (thiocyanates, isothiocyanates, nitriles, epithionitriles, oxazolidinethiones), as well as phenolics, tannins, cyanogenic glycosides, and alkaloids. These SMs play a critical role in resistance against pathogens and herbivores, thereby enhancing plant resilience to biotic stresses. The biosynthetic pathways of these SMs have been targeted to develop disease-resistant varieties using molecular, transgenic, and genome-editing technologies. The regulatory roles of different transcription factors, such as MYCs, MYBs, ERF, WRKYs, and NAC, in the biosynthesis of SMs and disease tolerance have been revealed. Phytohormones such as jasmonic acid, salicylic acid, and brassinosteroids activate regulatory transcription factors and stimulate key enzymes involved in SM pathways. The information and analysis in the present review could be used to modulate SM synthesis in Brassica crops to generate more palatable, nutritious, and stress-tolerant varieties. Such efforts would increase crop yields and also reduce the use of harmful agrochemicals, contributing to a more sustainable agricultural ecosystem.