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. Methyl ethyl ketone (MEK) is an important compound in atmospheric chemistry.While attention has been paid mostly to anthropogenic sources of MEK,recently it has been shown that biogenic sources are globally as important asanthropogenic ones. However, the origin of biogenic MEK has yet to becompletely elucidated. We present the full mechanism by which within-planttransformation of methyl vinyl ketone (MVK) and, to a minor extent, of2-butanol and 3-buten-2-ol, is a source of biogenic MEK. Such transformationis observed in red oak for both exogenous MVK, taken up from the atmosphere,and endogenous MVK generated within a plant when it experiences stress (e.g. heat stress).Endogenous MVK emitted by plants is typically explained by within-plantoxidation of isoprene caused by oxidative stress. In this study we show thatMVK and MEK emissions caused by heat stress are not related to isoprene inisoprene-emitting plants, implying that the massive carbon investment thatplants commit to isoprene production is not explained by a direct antioxidantrole. The presented mechanism can be important for inclusion in plantemission and in plant–atmosphere interaction models.

A mechanism for biogenic production and emission of MEK from MVK decoupled from isoprene biosynthesis