Abstract
Measuring quantitative changes in plant hormones and derivatives is crucial to understand how reactive oxygen species trigger signaling cascades to regulate stress responses. In this chapter, we describe the liquid chromatography-mass spectrometry procedure that we use to extract and quantify salicylic acid (SA), jasmonic acid (JA), and related compounds in common extracts of Arabidopsis tissue. The method can provide quantitative data on SA, SA glucosides, and JA, as well as information on oxidized and conjugated forms of these compounds and related derivatives of benzoic acid.
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