Feedback limitation of photosynthesis at high CO2 acts by modulating the activity of the chloroplast ATP synthase

Functional Plant Biology : FPB
Olavi KiiratsDavid M Kramer

Abstract

It was previously shown that photosynthetic electron transfer is controlled under low CO2 via regulation of the chloroplast ATP synthase. In the current work, we studied the regulation of photosynthesis under feedback limiting conditions, where photosynthesis is limited by the capacity to utilise triose-phosphate for synthesis of end products (starch or sucrose), in a starch-deficient mutant of Nicotiana sylvestris Speg. & Comes. At high CO2, we observed feedback control that was progressively reversed by increasing O2 levels from 2 to 40%. The activity of the ATP synthase, probed in vivo by the dark-interval relaxation kinetics of the electrochromic shift, was proportional to the O2-induced increases in O2 evolution from PSII (JO2), as well as the sum of Rubisco oxygenation (vo) and carboxylation (vc) rates. The altered ATP synthase activity led to changes in the light-driven proton motive force, resulting in regulation of the rate of plastoquinol oxidation at the cytochrome b6f complex, quantitatively accounting for the observed control of photosynthetic electron transfer. The ATP content of the cell decreases under feedback limitation, suggesting that the ATP synthesis was downregulated to a larger extent than ATP consumptio...Continue Reading

References

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Citations

Oct 19, 2019·Journal of Experimental Botany·Thomas D Sharkey
Sep 10, 2014·Plant Biotechnology Journal·Jitender SinghMalireddy K Reddy
Mar 15, 2019·Journal of Experimental Botany·Alan M McClain, Thomas D Sharkey
Jun 16, 2010·Photosynthesis Research·Olavi KiiratsGerald E Edwards
Dec 28, 2017·Journal of Experimental Botany·Keshav Dahal, Greg C Vanlerberghe
Jul 30, 2010·Journal of Integrative Plant Biology·Thomas D Sharkey, Ru Zhang
Apr 14, 2021·Communications Biology·Yunke PengI Colin Prentice
Oct 6, 2010·Plant Physiology·Susanne von Caemmerer, John R Evans
Jun 3, 2021·International Journal of Molecular Sciences·Ginga Shimakawa, Chikahiro Miyake

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