Journal
PLANT BIOTECHNOLOGY JOURNAL
Volume 19, Issue 3, Pages 575-588Publisher
WILEY
DOI: 10.1111/pbi.13487
Keywords
C-4 photosynthesis; rice; metabolic engineering
Funding
- Bill & Melinda Gates Foundation [OPP1129902]
- Max Planck Society
- Australian Research Council [DP150101037, CE140100015]
- European Union [637765]
- National Collaborative Research Infrastructure Strategy of the Australian Government
- CSIRO Black Mountain MicroImaging Centre
- Bill and Melinda Gates Foundation [OPP1129902] Funding Source: Bill and Melinda Gates Foundation
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Introducing a C-4 photosynthetic mechanism into C-3 crops offers the potential to improve photosynthetic efficiency, biomass, and yield, especially in rice. The study showed that with enhanced levels of introduced C-4 proteins, a functional C-4 pathway could be achieved in rice.
Introduction of a C-4 photosynthetic mechanism into C-3 crops offers an opportunity to improve photosynthetic efficiency, biomass and yield in addition to potentially improving nitrogen and water use efficiency. To create a two-cell metabolic prototype for an NADP-malic enzyme type C-4 rice, we transformed Oryza sativa spp.japonica cultivar Kitaake with a single construct containing the coding regions of carbonic anhydrase, phosphoenolpyruvate (PEP) carboxylase, NADP-malate dehydrogenase, pyruvate orthophosphate dikinase and NADP-malic enzyme from Zea mays, driven by cell-preferential promoters. Gene expression, protein accumulation and enzyme activity were confirmed for all five transgenes, and intercellular localization of proteins was analysed. (CO2)-C-13 labelling demonstrated a 10-fold increase in flux though PEP carboxylase, exceeding the increase in measured in vitro enzyme activity, and estimated to be about 2% of the maize photosynthetic flux. Flux from malate via pyruvate to PEP remained low, commensurate with the low NADP-malic enzyme activity observed in the transgenic lines. Physiological perturbations were minor and RNA sequencing revealed no substantive effects of transgene expression on other endogenous rice transcripts associated with photosynthesis. These results provide promise that, with enhanced levels of the C-4 proteins introduced thus far, a functional C-4 pathway is achievable in rice.
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