The temperature response of photosynthesis in tobacco with reduced amounts of Rubisco

Plant, Cell & Environment
David S Kubien, Rowan F Sage

Abstract

The reasons for the decline in net CO2 assimilation (A) above its thermal optimum are controversial. We tested the hypothesis that increasing the ratio of Rubisco activase to Rubisco catalytic site concentration would increase the activation state of Rubisco at high temperatures. We measured photosynthetic gas exchange, in vivo electron transport (J) and the activation state of Rubisco between 15 and 45 degrees C, at 38 and 76 Pa ambient CO2, in wild-type (WT) and anti-rbcS tobacco. The Rubisco content of the anti-rbcS lines was 30% (S7-1) or 6% (S7-2) of WT, but activase levels were the same in the three genotypes. Anti-rbcS plants had lower A than WT at all temperatures, but had a similar thermal optimum for photosynthesis as WT at both CO2 levels. In WT plants, Rubisco was fully activated at 32 degrees C, but the activation state declined to 64% at 42 degrees C. By contrast, the activation state of Rubisco was above 90% in the S7-1 line, between 15 and 42 degrees C. Both A and J declined about 20% from T(opt) to the highest measurement temperatures in WT and the S7-1 line, but this was fully reversed after a 20 min recovery at 35 degrees C. At 76 Pa CO2, predicted rates of RuBP regeneration-limited photosynthesis corresponde...Continue Reading

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Citations

Sep 26, 2013·Molecular Biology Reports·Yusong JiangYizheng Zhang
Apr 2, 2013·Photosynthesis Research·Amanda P Cavanagh, David S Kubien
Aug 8, 2009·Journal of Experimental Botany·H EichelmannA Laisk
Oct 13, 2009·Journal of Experimental Botany·Andrew P ScafaroBrian J Atwell
Oct 3, 2012·Journal of Experimental Botany·G Dean PriceJohn R Evans
Jul 30, 2010·Journal of Integrative Plant Biology·Thomas D Sharkey, Ru Zhang
Apr 26, 2008·Journal of Experimental Botany·Rowan F SageDavid S Kubien
Sep 28, 2017·Bioscience, Biotechnology, and Biochemistry·Akiho Yokota

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