Figure S1 A. Leaf volatile collection chambers designed for push-pull collection with slight positive pressure inside to isolate the air space. In the current studies, 2.5 L/min charcoal-filtered air was pushed into the chamber via flexible Teflon tubing and 1.0L/min pulled out through a SuperQ column. The Teflon frame was machined with grooves such that the bottom plate of glass is fixed in position, while the upper plate slides to open. B.Simultaneous collection from LPIn+1 and LPIn+5 leaves. The petioles of the two samples leaves are visibly non-orthostichous to one another.

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