High temperature enhances inhibitor production but reduces fallover in tobacco Rubisco

Functional Plant Biology : FPB
Stephen M SchraderSusanne von Caemmerer

Abstract

High temperature inhibits photosynthesis by several mechanisms including reduction in Rubisco activity. While the initial reaction velocity of purified, fully carbamylated, inhibitor-free Rubisco increases with temperature in vitro, over time, the reaction velocity slowly declines (fallover) because of the enzymatic and non-enzymatic production of inhibitors from the substrate ribulose-1,5-bisphosphate. We tested whether fallover could contribute to the decline in Rubisco activity observed in leaf extracts at high temperature. Production of d-xylulose-1,5-bisphosphate (XuBP), an inhibitor of Rubisco, was greater at 35 and 45°C than at 25°C but fallover was less severe at 35 and 45°C than at 25°C, both in rate and extent under saturating CO2 and ambient O2. This apparent dichotomy is consistent with the catalytic site of Rubisco loosening at higher temperatures and releasing inhibitors more easily. The loosening of the catalytic site was supported by the observation that RuBP and XuBP were released from their complexes with uncarbamylated, Mg2+-free Rubisco faster at 35 and 45°C than at 25°C. We conclude that, although XuBP production increased relative to catalytic throughput at higher temperatures, this was more than compensat...Continue Reading

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Citations

Jul 31, 2007·Plant, Cell & Environment·Rowan F Sage, David S Kubien
Aug 1, 2007·Photosynthesis Research·Archie R Portis, Martin A J Parry
Nov 20, 2012·Journal of Experimental Botany·Martin A J ParrySpencer M Whitney
May 2, 2007·Plant, Cell & Environment·Stephen M SchraderThomas D Sharkey
Dec 6, 2008·Physiologia Plantarum·Aitor AlonsoRafael Martínez-Carrasco
Aug 16, 2014·Plant, Cell & Environment·Elizabete Carmo-SilvaMartin A J Parry
May 5, 2020·The Plant Journal : for Cell and Molecular Biology·Gustaf E DegenElizabete Carmo-Silva
Jun 12, 2013·Photosynthesis Research·Jeroni GalmésJaume Flexas
Jul 6, 2011·Photosynthesis Research·A Elizabete Carmo-Silva, Michael E Salvucci
Sep 24, 2020·The New Phytologist·Gustaf E DegenElizabete Carmo-Silva
Feb 24, 2021·Journal of Experimental Botany·Caitlin E MooreAmanda P Cavanagh

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