Rubisco activase is a key regulator of non-steady-state photosynthesis at any leaf temperature and, to a lesser extent, of steady-state photosynthesis at high temperature

The Plant Journal : for Cell and Molecular Biology
Wataru YamoriAmane Makino

Abstract

The role of Rubisco activase in steady-state and non-steady-state photosynthesis was analyzed in wild-type (Oryza sativa) and transgenic rice that expressed different amounts of Rubisco activase. Below 25°C, the Rubisco activation state and steady-state photosynthesis were only affected when Rubisco activase was reduced by more than 70%. However, at 40°C, smaller reductions in Rubisco activase content were linked to a reduced Rubisco activation state and steady-state photosynthesis. As a result, overexpression of maize Rubisco activase in rice did not lead to an increase of the Rubisco activation state, nor to an increase in photosynthetic rate below 25°C, but had a small stimulatory effect at 40°C. On the other hand, the rate at which photosynthesis approached the steady state following an increase in light intensity was rapid in Rubisco activase-overexpressing plants, intermediate in the wild-type, and slowest in antisense plants at any leaf temperature. In Rubisco activase-overexpressing plants, Rubisco activation state at low light was maintained at higher levels than in the wild-type. Thus, rapid regulation by Rubisco activase following an increase in light intensity and/or maintenance of a high Rubisco activation state at...Continue Reading

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Citations

Mar 27, 2013·Photosynthesis Research·Antony N DoddMitsumasa Hanaoka
Dec 11, 2013·PloS One·Weimin LiYuyang Wang
Feb 4, 2014·Antioxidants & Redox Signaling·Monica BalseraBob B Buchanan
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Mar 4, 2020·International Journal of Molecular Sciences·Mao SuganamiAmane Makino
May 23, 2020·The New Phytologist·Lorna McAusland, Erik H Murchie

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