Insect footsteps on leaves stimulate the accumulation of 4-aminobutyrate and can be visualized through increased chlorophyll fluorescence and superoxide production.

@article{Bown2002InsectFO,
  title={Insect footsteps on leaves stimulate the accumulation of 4-aminobutyrate and can be visualized through increased chlorophyll fluorescence and superoxide production.},
  author={Alan W. Bown and Dawn E. Hall and Kennaway B Macgregor},
  journal={Plant physiology},
  year={2002},
  volume={129 4},
  pages={1430-4}
}
A substantial literature has demonstrated that within 2 to 3 h of insect herbivory or mechanical damage, plants synthesize wound-induced proteinase inhibitors that inhibit digestion (Bergey et al., 1996; Ryan, 2000). In contrast, we demonstrate here that the simple non-wounding crawling of insect larvae stimulates the synthesis of 4-aminobutyrate (GABA) within minutes, and that imprints of insect footsteps can be visualized within seconds through increases in chlorophyll fluorescence or… CONTINUE READING
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