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Title: Light regulation of light-harvesting antenna size substantially enhances photosynthetic efficiency and biomass yield in green algae

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.14751· OSTI ID:1843740
ORCiD logo [1];  [2];  [3];  [2];  [4];  [4];  [2]; ORCiD logo [1];  [5]; ORCiD logo [6]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Donald Danforth Plant Science Center, St. Louis, MO (United States)
  3. Stanford Univ., Palo Alto, CA (United States)
  4. National Inst. for Basic Biology, Okazaki (Japan); The Graduate Univ. for Advanced Studies (SOKENDAI), Okazaki (Japan); Japan Science and Technology Agency (JST), Okazaki (Japan)
  5. Univ. of Illinois at Urbana-Champaign, IL (United States)
  6. New Mexico Consortium, Los Alamos, NM (United States)

One of the major factors limiting biomass productivity in algae is the low thermodynamic efficiency of photosynthesis. The greatest thermodynamic inefficiencies in photosynthesis occur during the conversion of light into chemical energy. At full sunlight the light-harvesting antenna captures photons at a rate nearly 10 times faster than the rate-limiting step in photosynthetic electron transport. Excess captured energy is dissipated by non-productive pathways including the production of reactive oxygen species. Substantial improvements in photosynthetic efficiency have been achieved by reducing the optical cross-section of the light-harvesting antenna by selectively reducing chlorophyll b levels and peripheral light-harvesting complex subunits. Smaller light-harvesting antenna, however, may not exhibit optimal photosynthetic performance in low or fluctuating light environments. Additionally, we describe a translational control system to dynamically adjust light-harvesting antenna sizes for enhanced photosynthetic performance. Furthermore, by expressing a chlorophyllide a oxygenase (CAO) gene having a 5' mRNA extension encoding a Nab1 translational repressor binding site in a CAO knockout line it was possible to continuously alter chlorophyll b levels and correspondingly light-harvesting antenna sizes by light-activated Nab1 repression of CAO expression as a function of growth light intensity. Significantly, algae having light-regulated antenna sizes had substantially higher photosynthetic rates and two-fold greater biomass productivity than the parental wild-type strains as well as near wild-type ability to carry out state transitions and non-photochemical quenching. These results have broad implications for enhanced algae and plant biomass productivity.

Research Organization:
Colorado School of Mines, Golden, CO (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); U.S. Air Force Office of Scientific Research; Japan Society for the Promotion of Science (JSPS); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
EE0007089; DE‐SC0001035; 20120535ER; 89233218CNA000001; SC0001035; EE0006316; FA9550‐08‐1‐0451; 16H06553; EE00030406
OSTI ID:
1843740
Alternate ID(s):
OSTI ID: 1615447; OSTI ID: 1645093
Report Number(s):
LA-UR-20-23241; 23870033; 26251033; 16H06553; 20120535ER
Journal Information:
The Plant Journal, Vol. 103, Issue 2; ISSN 0960-7412
Publisher:
Society for Experimental BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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