Accumulation of 5-hydroxynorvaline in maize (Zea mays) leaves is induced by insect feeding and abiotic stress.
Bottom Line: In contrast, ethylene signalling reduced 5-hydroxynorvaline abundance.When 5-hydroxynorvaline was added to aphid artificial diet at concentrations similar to those found in maize leaves and stems, R. maidis reproduction was reduced, indicating that this maize metabolite may have a defensive function.Among 27 tested maize inbred lines there was a greater than 10-fold range in the accumulation of foliar 5-hydroxynorvaline.
Affiliation: Boyce Thompson Institute for Plant Research, Ithaca, NY, USA.Show MeSH
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Mentions: In addition to methyl jasmonate (Fig. 2A), abscisic acid (Fig. 2B) and salicylic acid (Fig. 2C) treatment transiently increased 5-hydroxynorvaline accumulation in maize seedlings. In contrast, treatment with 1-aminocyclopropane-1-carboxylic acid (ACC, an ethylene metabolic precursor) reduced the 5-hydroxynorvaline abundance (Fig. 2D). Consistent with the observed induction by methyl jasmonate (Fig. 2A), 5-hydroxynorvaline accumulation was increased by aphid (R. maidis, Fig. 2E) and caterpillar (S. exigua, Fig. 2F) feeding. However, infection with a fungal pathogen, C. heterstrophus, did not increase 5-hydroxynorvaline concentrations to a higher level than mock-infected controls (Fig. 2G), despite the fact that C. heterstrophus-infected leaves showed visible tissue necrosis and mock-infected leaves did not.
Affiliation: Boyce Thompson Institute for Plant Research, Ithaca, NY, USA.