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Technical note: Manipulating interactions between plant stress responses and soil methane oxidation rates

Abstract. It has recently been hypothesised that ethylene, released into soil by stressed
plants, reduces the oxidation of methane by methanotroph. To test this, a
field trial was established in which maize plants were grown with and without
soil moisture stress, and the effects of addition aminoethoxyvinylglycine
(AVG; an ethylene biosynthesis inhibitor) and biochar (increases soil water
holding capacity and reduces plant stress) were determined following the
static incubation of soil samples. AVG increased methane oxidation rates by
50 % (P=0.039), but only in the absence of irrigation. No other
treatment effects were observed. This result provides evidence for a positive
feedback system between plant stress, ethylene production, and impacts on
methanotrophic activity.
