Abstract
Abundant research suggests that jasmonic acid can regulate a plant's responses to wounding, insects and some pathogens. Following exposure to such stimuli, jasmonic acid concentrations are known to increase. Exogenous applications of jasmonic acid upregulate the expression of several defense-related genes. In addition, mutations in genes that are crucial for jasmonic acid biosynthesis or sensing cause reduced resistance to some biotic stresses. However, Annick Stintzi et al. [1] now provide evidence that this is not true for all jasmonic acid-related mutants, suggesting that jasmonic acid is not the only jasmonate family member with the capability to activate plant defenses in vivo. They show that jasmonic acid has partially overlapping resistance functions with an upstream precursor – the cyclopentenone, 12-oxo-phytodienoic acid (OPDA) – and propose that other oxylipins could have similar effects.
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