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Underwater PN in green tips and whole leaves of I. australis. Entire leaves or apical green leaf tips, in both cases with the cut surface sealed with paraffin, were incubated in glass vials attached to a rotating wheel within a water bath at 20 °C and PN was measured as O2 evolution during 60 min of incubation. PN is expressed per area of green tissue for green tips as well as for whole leaves. Means ±SE, n=5, and letters indicate significant differences (Student's t-test; P<0.05).
