Journal article
Exploiting leaf starch synthesis as a transient sink to elevate photosynthesis, plant productivity and yields
Plant science (Limerick), Vol.181(3), pp.275-281
2011
Handle:
https://hdl.handle.net/2376/110521
PMID: 21763538
Abstract
► In this manuscript, we increased the flow of fixed carbon into leaf starch. ►
Arabidopsis thaliana and rice plants expressing this mutant enzyme have higher starch turnover levels during the diurnal cycle. ► Such plants showed increased photosynthesis, plant growth and seed yields. ► These results conclusively demonstrate that the photosynthetic capacity of plants is much lower than optimum because of photosynthetic feedback. ► Starch can be used as a transient sink to increase photosynthetic capacity which will result in increase plant productivity and yields.
Improvements in plant productivity (biomass) and yield have centered on increasing the efficiency of leaf CO
2 fixation and utilization of products by non-photosynthetic sink organs. We had previously demonstrated a correlation between photosynthetic capacity, plant growth, and the extent of leaf starch synthesis utilizing starch-deficient mutants. This finding suggested that leaf starch is used as a transient photosynthetic sink to recycle inorganic phosphate and, in turn, maximize photosynthesis. To test this hypothesis,
Arabidopsis thaliana and rice (
Oryza sativa L.) lines were generated with enhanced capacity to make leaf starch with minimal impact on carbon partitioning to sucrose. The
Arabidopsis engineered plants exhibited enhanced photosynthetic capacity; this translated into increased growth and biomass. These enhanced phenotypes were displayed by similarly engineered rice lines. Manipulation of leaf starch is a viable alternative strategy to increase photosynthesis and, in turn, the growth and yields of crop and bioenergy plants.
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Details
- Title
- Exploiting leaf starch synthesis as a transient sink to elevate photosynthesis, plant productivity and yields
- Creators
- Kelly Gibson - Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164, USAJong-Sug Park - National Academy of Agricultural Science, RDA, Suwon 441-707, South KoreaYasuko Nagai - Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164, USASeon-Kap Hwang - Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164, USAYoung-Chan Cho - National Institute of Crop Science, RDA, Suwon 441-707, South KoreaKyung-Hee Roh - National Academy of Agricultural Science, RDA, Suwon 441-707, South KoreaSi-Myung Lee - National Academy of Agricultural Science, RDA, Suwon 441-707, South KoreaDong-Hern Kim - National Academy of Agricultural Science, RDA, Suwon 441-707, South KoreaSang-Bong Choi - Department of Biological Sciences, Myongji University, Yongin 449-728, South KoreaHiroyuki Ito - Department of Chemical and Biological Engineering, Akita National College of Technology, Iishimabunkyou-cyo 1-1, Akita 011-8511, JapanGerald E Edwards - Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164, USAThomas W Okita - Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164, USA
- Publication Details
- Plant science (Limerick), Vol.181(3), pp.275-281
- Academic Unit
- Pharmacotherapy, Department of; Biological Chemistry, Institute of; Biological Sciences, School of
- Publisher
- Elsevier Ireland Ltd
- Identifiers
- 99900547004701842
- Language
- English
- Resource Type
- Journal article