Prospects for Engineering Biophysical CO 2 Concentrating Mechanisms into Land Plants to Enhance Yields.

TitleProspects for Engineering Biophysical CO 2 Concentrating Mechanisms into Land Plants to Enhance Yields.
Publication TypeJournal Article
Year of Publication2020
AuthorsHennacy, JH, Jonikas, MC
JournalAnnu Rev Plant Biol
Volume71
Pagination461-485
Date Published2020 Apr 29
ISSN1545-2123
Abstract

Although cyanobacteria and algae represent a small fraction of the biomass of all primary producers, their photosynthetic activity accounts for roughly half of the daily CO2 fixation that occurs on Earth. These microorganisms are able to accomplish this feat by enhancing the activity of the CO2-fixing enzyme Rubisco using biophysical CO2 concentrating mechanisms (CCMs). Biophysical CCMs operate by concentrating bicarbonate and converting it into CO2 in a compartment that houses Rubisco (in contrast with other CCMs that concentrate CO2 via an organic intermediate, such as malate in the case of C4 CCMs). This activity provides Rubisco with a high concentration of its substrate, thereby increasing its reaction rate. The genetic engineering of a biophysical CCM into land plants is being pursued as a strategy to increase crop yields. This review focuses on the progress toward understanding the molecular components of cyanobacterial and algal CCMs, as well as recent advances toward engineering these components into land plants.

DOI10.1146/annurev-arplant-081519-040100
Alternate JournalAnnu Rev Plant Biol
PubMed ID32151155