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<p>Plant resistance to insect herbivores depends chiefly on the activation of biochemical mechanisms. Present study demonstrated that fall armyworm (FAW) feeding, exogenous application of MeJA, and wounding followed by regurgitant application induced metabolites and defensive enzymes in seven maize genotypes. The findings revealed that the resistant and moderately resistant genotypes significantly induced higher ferulic and <i>p</i>-coumaric acid levels in response to FAW feeding and wounding, followed by regurgitation treatments. The amino acid profile revealed genotype-specific responses, in which MIL9-1260 (MR) exhibited the highest accumulation of essential amino acids, namely valine, methionine, phenylalanine, leucine, lysine, threonine, isoleucine, and non-essential amino acids like alanine, aspartic acid, glutamic acid, serine, and tyrosine with MeJA treatment. However, in the susceptible genotype Sarhad HSRB, the levels of essential and non-essential amino acids decreased after treatment induction. The present study indicates that maize phenolic defense responses were highly induced by FAW attack while amino acid levels and enzymatic (POX and SOD) activities triggered with MeJA in most of the resistant and moderately resistant genotypes. Furthermore, the genotypes MIL 9–1308 and MIL 9–1309 were identified as best sources of resistance and could be utilized in the breeding program to develop FAW-resistant maize hybrids.</p>

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Differential induction of phenolics, amino acids, and antioxidant enzyme activities in maize confers resistance to fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • G. Nikitha Reddy,
  • P. Lakshmi Soujanya,
  • S. M. Haldhar,
  • K. R. Yathish,
  • R. Venkateswarlu,
  • L. K. Mishra,
  • K. I. Singh,
  • L. N. K. Singh

摘要

Plant resistance to insect herbivores depends chiefly on the activation of biochemical mechanisms. Present study demonstrated that fall armyworm (FAW) feeding, exogenous application of MeJA, and wounding followed by regurgitant application induced metabolites and defensive enzymes in seven maize genotypes. The findings revealed that the resistant and moderately resistant genotypes significantly induced higher ferulic and p-coumaric acid levels in response to FAW feeding and wounding, followed by regurgitation treatments. The amino acid profile revealed genotype-specific responses, in which MIL9-1260 (MR) exhibited the highest accumulation of essential amino acids, namely valine, methionine, phenylalanine, leucine, lysine, threonine, isoleucine, and non-essential amino acids like alanine, aspartic acid, glutamic acid, serine, and tyrosine with MeJA treatment. However, in the susceptible genotype Sarhad HSRB, the levels of essential and non-essential amino acids decreased after treatment induction. The present study indicates that maize phenolic defense responses were highly induced by FAW attack while amino acid levels and enzymatic (POX and SOD) activities triggered with MeJA in most of the resistant and moderately resistant genotypes. Furthermore, the genotypes MIL 9–1308 and MIL 9–1309 were identified as best sources of resistance and could be utilized in the breeding program to develop FAW-resistant maize hybrids.