Optimizing Rubisco and its regulation for greater resource use efficiency

Carmo-Silva, Elizabete and Scales, Joanna C. and Madgwick, Pippa J. and Parry, Martin A. J. (2015) Optimizing Rubisco and its regulation for greater resource use efficiency. Plant, Cell and Environment, 38 (9). pp. 1817-1832. ISSN 0140-7791

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Abstract

Rubisco catalyses the carboxylation of ribulose-1,5-bisphosphate (RuBP), enabling net CO<inf>2</inf> assimilation in photosynthesis. The properties and regulation of Rubisco are not optimal for biomass production in current and projected future environments. Rubisco is relatively inefficient, and large amounts of the enzyme are needed to support photosynthesis, requiring large investments in nitrogen. The competing oxygenation of RuBP by Rubisco decreases photosynthetic efficiency. Additionally, Rubisco is inhibited by some sugar phosphates and depends upon interaction with Rubisco activase (Rca) to be reactivated. Rca activity is modulated by the chloroplast redox status and ADP/ATP ratios, thereby mediating Rubisco activation and photosynthetic induction in response to irradiance. The extreme thermal sensitivity of Rca compromises net CO<inf>2</inf> assimilation at moderately high temperatures. Given its central role in carbon assimilation, the improvement of Rubisco function and regulation is tightly linked with irradiance, nitrogen and water use efficiencies. Although past attempts have had limited success, novel technologies and an expanding knowledge base make the challenge of improving Rubisco activity in crops an achievable goal. Strategies to optimize Rubisco and its regulation are addressed in relation to their potential to improve crop resource use efficiency and climate resilience of photosynthesis.

Item Type: Journal Article
Journal or Publication Title: Plant, Cell and Environment
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1300/1314
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 75856
Deposited By: ep_importer_pure
Deposited On: 21 Oct 2015 05:01
Refereed?: Yes
Published?: Published
Last Modified: 25 Feb 2020 07:26
URI: https://eprints.lancs.ac.uk/id/eprint/75856

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