IP Library › Granted Patent US 12,534,736
Granted Patent B2
US 12,534,736 · App. 15/913,395 · Granted Jan 27, 2026

Plants with increased photorespiration efficiency

Inventors: Donald R. Ort (Champaign, IL); Paul F. South (Champaign, IL); Berkley Walker (Dusseldorf, DE)
Assignee: The United States of America, as Represented by the Secretary of Agriculture
C12N15/8218C12N15/8262C12N15/8269
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Quick Facts
Patent No.
US 12,534,736
App. No.
15/913,395
Granted
Jan 27, 2026
Kind
B2
Abstract

Presented herein are plants with altered photorespiratory characteristics. Disruption of transport proteins involved in shuttling glycolate and/or glycerate results in reductions in photosynthetic rates, reduced plant growth and alterations in gene expression and photosynthetic metabolite profiles. Such disruptions are also combined with introduced genes expressing components of alternate photorespiratory enzyme pathways to increase photosynthetic efficiency.

Claims (31)

1 . A genetically altered C3 plant, comprising a first heterologous polynucleotide encoding a malate synthase and a second heterologous polynucleotide encoding an algal glycolate dehydrogenase,

wherein the malate synthase and the algal glycolate dehydrogenase localize to a chloroplast of the plant,

wherein the first and second heterologous polynucleotides are heterologous to the genetically altered C3 plant,

wherein the genetically altered C3 plant further comprises a reduced glycolate and glycerate transport activity of an endogenous chloroplast inner membrane plastidic glycolate/glycerate translocator (PLGG1) protein in the genetically altered C3 plant as compared to a control plant lacking the genetic alterations,

wherein the malate synthase is at least 95% identical to amino acid residues 41-607 of SEQ ID NO: 43,

wherein the algal glycolate dehydrogenase is at least 95% identical to amino acid residues 41-1136 of SEQ ID NO: 45,

wherein the endogenous PLGG1 protein is at least 70% identical to SEQ ID NO: 6 and has glycolate and glycerate transport activity,

wherein the endogenous PLGG1 protein localizes to the chloroplast inner membrane, and

wherein the genetically altered C3 plant has increased biomass or increased photosynthetic efficiency when cultivated under ambient carbon dioxide conditions compared to a corresponding wild-type C3 plant that is cultivated under ambient carbon dioxide conditions, comprises endogenous levels of the endogenous PLGG1 protein, and does not comprise the first or second heterologous polynucleotides.

2 . The genetically altered C3 plant of claim 1 , wherein the first heterologous polynucleotide encodes an amino acid sequence at least 95% identical to SEQ ID NO: 43 and the second heterologous polynucleotide encodes an amino acid sequence at least 95% identical to SEQ ID NO: 45.

3 . The genetically altered C3 plant of claim 1 , wherein the endogenous PLGG1 protein has at least 75% sequence identity, at least 80% sequence identity, at least 85% sequence identity, or at least 90% sequence identity to SEQ ID NO: 6.

4 . The genetically altered C3 plant of claim 1 , wherein the endogenous PLGG1 protein has at least 95% sequence identity to SEQ ID NO: 6.

5 . The genetically altered C3 plant of claim 1 , wherein the plant is selected from the group consisting of rice, soybean, potato, cowpea, barley, wheat, and cassava.

6 . The genetically altered C3 plant of claim 1 , wherein the reduced activity of the endogenous PLGG1 protein is due to an RNAi module that expresses an RNAi polynucleotide with a high percent identity to the endogenous PLGG1 mRNA.

7 . The genetically altered C3 plant of claim 6 , wherein the RNAi polynucleotide has at least 85% sequence identity across a 16 nucleotide sequence within the RNA sequence encoded by the cDNA sequence provided by SEQ ID NO: 5.

8 . The genetically altered C3 plant of claim 7 , wherein the RNAi polynucleotide has at least 85% sequence identity across a 40 nucleotide sequence within the RNA sequence encoded by the cDNA sequence provided by SEQ ID NO: 5.

9 . The genetically altered C3 plant of claim 1 , wherein the genetically altered C3 plant has an increased rate of growth, an increased plant size, or an enhanced photosynthetic efficiency as compared to a C3 plant expressing only the malate synthase and the algal glycolate dehydrogenase.

10 . The genetically altered C3 plant of claim 1 , wherein the genetically altered C3 plant has an increased rate of growth, an increased plant size, decreased glycolate accumulation when grown at 150 ppm CO 2 , and/or an enhanced photosynthetic efficiency as compared to a C3 plgg1 plant not expressing the malate synthase and the algal glycolate dehydrogenase.

11 . A genetically altered C3 plant, comprising a first heterologous polynucleotide encoding a malate synthase and a second heterologous polynucleotide encoding an algal glycolate dehydrogenase,

wherein the malate synthase and the algal glycolate dehydrogenase localize to a chloroplast of the plant,

wherein the first and second heterologous polynucleotides are heterologous to the genetically altered C3 plant,

wherein the genetically altered C3 plant further comprises a reduced glycolate and/or glycerate transport activity of an endogenous chloroplast inner membrane plastidic glycolate/glycerate translocator (PLGG1) protein in the genetically altered C3 plant as compared to a control plant lacking the genetic alterations,

wherein the malate synthase is at least 95% identical to amino acid residues 41-607 of SEQ ID NO: 43,

wherein the algal glycolate dehydrogenase is at least 95% identical to amino acid residues 41-1136 of SEQ ID NO: 45,

wherein the endogenous PLGG1 protein is a homolog of SEQ ID NO: 6 and has glycolate and/or glycerate transport activity, and

wherein the endogenous PLGG1 protein localizes to the chloroplast inner membrane,

wherein the genetically altered C3 plant has increased biomass or increased photosynthetic efficiency when cultivated under ambient carbon dioxide conditions compared to a corresponding wild-type C3 plant that is cultivated under ambient carbon dioxide conditions, comprises endogenous levels of the endogenous PLGG1 protein, and does not comprise the first or second heterologous polynucleotides.

12 . The genetically altered C3 plant of claim 1 , further comprising:

an RNAi polynucleotide targeting the endogenous PLGG1,

wherein the RNAi polynucleotide comprises a sense strand comprising at least 16 contiguous nucleotides of the endogenous PLGG1 and an antisense strand that is fully complementary to the at least 16 contiguous nucleotides of the sense strand, wherein the sense strand and the antisense strand form a dsRNA.

13 . The genetically altered C3 plant of claim 12 , wherein the RNAi polynucleotide is at least 95% identical to SEQ ID NO: 46.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 21, 2018
From: ORT, DONALD R.; SOUTH, PAUL F.; WALKER, BERKLEY
To: THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF AGRICULTURE
Reel/Frame 046941/0264 →
Continuity (2)
Provisional Application 62467993 · Mar 7, 2017
Related Publication 20180258440A1 · Sep 13, 2018
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