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Annals of Botany 30: 339-347, 1966
© 1966 Annals of Botany Company

RESEARCH-ARTICLE

The Effect of Inhibitors on the Path of Carbon in Photosynthesis by Chlorella at Low Partial Pressures of CO2

II. The Effect of Inhibitors on Oxygen Evolution

B. J. MIFLIN1 and C. P. WHITTINGHAM

Botany Department, Imperial College London, S.W.7

1Present address: Dept. of Plant Science, The University, Newcastle upon Tyne, 1.

The effects of two inhibitors of photosynthetic oxygen evolution (DCMU and hydroxylamine) on the incorporation of radioactivity into photosynthetic intermediates during photosynthesis in Chlorella has been investigated. The effect of addition of DCMU is similar to that observed previously as a consequence of darkening, Hydroxylamine stimulated incorporation into glycollate but decreased that into the sugar mono- and di-phosphates of the PSCR cycle. Transient changes observed upon the addition of hydroxylamine suggest that glycollate may be derived from the intermediates of the PSCR cycle. This action of hydroxylamine is not believed to be due to its inhibition of the mechanism of oxygen evolution.


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