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Mass spectrometric analysis of the gas exchange of illuminated leaflets of 10-14 d old pea seedlings revealed not only  16 O 2 -liberation from photosynthetic H 2  16 O-splitting, but also uptake of  18 O 2 , applied to the gas phase of the reaction vessel. Isolated intact chloroplasts of such leaflets suspended in a medium containing NaHCO 3  and glycerate 3-phosphate, on irradiation with blue (λ 448 nm) or red (λ 679 nm) light also produced  16 O 2  from water oxidation and consumed  18 O 2  from the gas phase. The two reactions were saturated at the same quantum fluence rates. Uptake of  18 oxygen was not affected by inhibitors of mito­chondrial respiration (alternative pathway included), such as rotenone (5 x l0 -5  ᴍ), antimycin A (5 x l0 -6  ᴍ), KCN (10 -3  ᴍ), SHAM (10 -3  ᴍ), or propylgallate (10 -3  ᴍ). It was, however, absent, when photosynthetic  16 oxygen evolution was completely inhibited by DCMU (10 -5  ᴍ). DBMIB (10 -5  ᴍ), assumed to prevent electron flow from plastoquinone pool to the cytochrome b 6 /f-complex, suppressed photosynthetic oxygen evolution, but did not impair uptake of  18 O 2 . A similar result was obtained at application of 4 x l0 -5  ᴍ antimycin A.

Oxygen Uptake during Photosynthesis of Isolated Pea Chloroplasts