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Time course of An (A) and gs (B) during ABA feeding of a leaf of R. rubiginosa. ABA was added to the water supply of the petiole to bring its concentration to 10−4 m. Leaflet atmosphere was 340 μmol mol−1 CO2, 21% (•) or 0.1% (○) O2, and 70% RH. The photon flux density was 410 μmol m−2 s−1.
