Root and shoot gas exchange respond additively to moderate ozone and methyl jasmonate without induction of ethylene: ethylene is induced at higher O3 concentrations.

Responses of LA to increasing O 3 were parallel in +MeJA and –MeJA plants, so that the highly significant impacts of both factors were strictly additive (i.e. with no significant O 3 ×MeJA interaction) ( Table 1 ).

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