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The Regulation of Photosynthetic Electron Transport during Nutrient Deprivation in Chlamydomonas reinhardtii1

Dennis D. Wykoff*, John P. Davies, Anastasios Melis, and Arthur R. Grossman

The Carnegie Institution of Washington, Department of Plant Biology, 260 Panama Street, Stanford, California 94305 (D.D.W., J.P.D., A.R.G.); Department of Biological Sciences, Stanford University, Stanford, California 94305 (D.D.W.); and Department of Plant Biology, 411 Koshland Hall, University of California, Berkeley, California 94720 (A.M.)

The light-saturated rate of photosynthetic O2 evolution in Chlamydomonas reinhardtii declined by approximately 75% on a per-cell basis after 4 d of P starvation or 1 d of S starvation. Quantitation of the partial reactions of photosynthetic electron transport demonstrated that the light-saturated rate of photosystem (PS) I activity was unaffected by P or S limitation, whereas light-saturated PSII activity was reduced by more than 50%. This decline in PSII activity correlated with a decline in both the maximal quantum efficiency of PSII and the accumulation of the secondary quinone electron acceptor of PSII nonreducing centers (PSII centers capable of performing a charge separation but unable to reduce the plastoquinone pool). In addition to a decline in the light-saturated rate of O2 evolution, there was reduced efficiency of excitation energy transfer to the reaction centers of PSII (because of dissipation of absorbed light energy as heat and because of a transition to state 2). These findings establish a common suite of alterations in photosynthetic electron transport that results in decreased linear electron flow when C. reinhardtii is limited for either P or S. It was interesting that the decline in the maximum quantum efficiency of PSII and the accumulation of the secondary quinone electron acceptor of PSII nonreducing centers were regulated specifically during S-limited growth by the SacI gene product, which was previously shown to be critical for the acclimation of C. reinhardtii to S limitation (J.P. Davies, F.H. Yildiz, and A.R. Grossman [1996] EMBO J 15: 2150-2159).

1   D.D.W. was supported as a predoctoral trainee by the National Institutes of Health (grant no. GM07276). This work was also supported by the Carnegie Institution of Washington, the U.S. Department of Agriculture (grant no. 9302076), and the National Science Foundation (grant no. IBN950-6254). This is Carnegie Institution of Washington Department of Plant Biology publication no. 1327.
*   Corresponding author; e-mail dwykoff{at}andrew.stanford.edu; fax 1-650-325-6857.

Plant Physiol. (1998) 117: 129-139
Copyright Clearance Center:   0032-0889/98/117/0129/11
© 1998 American Society of Plant Physiologists




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