Plants with improved photosynthetic carbon fixation capacity

a technology of carbon fixation capacity and plants, applied in the field of plants with improved photosynthetic carbon fixation capacity, can solve the problems of increased oxygenase reaction, low turnover number of carbon fixation, and inefficient enzymes, and achieve the effects of increasing carbon fixation, increasing photosynthetic carbon assimilation, and stimulating plant growth

Inactive Publication Date: 2019-12-12
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention describes a method of improving the growth and carbon absorption of plants by using two different types of nucleic acids. One nucleic acid encodes an enzyme that helps break down a chemical called sedoheptulose 1,7-bisphosphatase. The other nucleic acid encodes a protein that has the activity of glycolate dehydrogenase. When these two nucleic acids are used together, the plants grow faster, absorb more carbon, and produce more biomass.

Problems solved by technology

A major problem with the C3 cycle is the enzyme Rubisco.
Rubisco is not only an inefficient enzyme with a low turnover number, but it also catalyses two competing reactions: carboxylation and oxygenation of RuBP.
The oxygenation reaction directs the flow of carbon through the photorespiratory pathway and and can result in losses of between 25-30% of the carbon fixed.
Environmental variables, such as high temperature and drought, can result in an increase in the oxygenase reaction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

Combined Expression of SBPase and Glycolate Dehydrogenase in Wheat

[0076]Using conventional recombinant gene techniques, a recombinant gene encoding glycolate dehydrogenase under control of a rice Rubisco small subunit promoter was constructed by operably linking the following DNA regions:[0077]a. A DNA region having a sequence including the promoter region of the ribulosebisphosphate carboxylase small subunit gene of Oryza sativa (rice) (Nomura et al., 2000) (SEQ ID No 10 between nucleotides 75-2824)[0078]b. A DNA region coding for the first intron of the Actin 1 gene of Oryza sativa (rice) (Mc Elroy et al., 1990). (SEQ ID No 10 between nucleotides 2825-3293)[0079]c. A DNA region encoding the optimized transit peptide, containing sequence of the RuBisCO small subunit genes of Zea mays (corn) and Helianthus annuus (sunflower) (Lebrun et al., 1996), adapted to wheat codon usage (SEQ ID No 10 between nucleotides 3294-3665)[0080]d. A DNA region encoding the mature part of the glycolate ...

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Abstract

Plants are provided with increased ribulose-1,5-bisphosphate (RuBP) regeneration capacity during the Calvin cycle through increased expression of sedoheptulose 1,7 bisphosphatase, in combination with reduced photo-respiratory losses through expression of glycolate catabolizing enzymes. Such plants have a greater growth rate and / or improved biomass and / or increased carbon fixation compared to untreated plants, or plants comprising only one of the features above.

Description

FIELD OF THE INVENTION[0001]The inventions herein described relate to the agricultural field, more specifically to methods of improving photosynthesis in plants, including crop plants as well as plants obtained by such methods. Specifically, the invention relates to plants with increased ribulose-1,5-bisphosphate (RuBP) regeneration capacity during the Calvin cycle through increased expression of seduheptulose 1,7 biosphosphatase, in combination with reduced photo-respiratory losses through expression of glycolate catabolizing enzymes. Such plants have a greater growth rate and / or improved biomass and / or increased carbon fixation compared to untreated plants, or plants comprising only one of the characteristics above described.BACKGROUND ART[0002]Crop productivity is influenced by many factors, among which are, on the one hand factors influencing the capacity of the plant to produce biomass (photosynthesis, nutrient and water uptake), and on the other hand factors influencing the ca...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N15/82C12N9/16C12N9/04
CPCC12Y301/03011C12Y301/03037C12N9/16C12N15/8261C12N9/0006C12Y101/99014C12N15/8269Y02A40/146
Inventor PETERHAENSEL, CHRISTOPHVAN RIE, JEROENFROHBERG, CLAUS
Owner BASF SE
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