ArticleJournal of experimental botany2019
Efficient 2-phosphoglycolate degradation is required to maintain carbon assimilation and allocation in the C4 plant Flaveria bidentis.
Article in Journal of experimental botany, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.
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16 citing papers in PubMed, 45 citations in OpenAlex.
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- Agrobacterium-mediated transient transformation of Flaveria bidentis leaves: a novel method to examine the evolution of CPlant methods · 2024Article
- Perspectives on improving photosynthesis to increase crop yield.The Plant cell · 2024Review
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- Genetic evidence for functions of Chloroplast CA in Pyropia yezoensis: decreased CCM but increased starch accumulation.Advanced biotechnology · 2024Article
- Molecular Characterization of Germin-like Protein Genes inACS omega · 2023Article
- The role of photorespiration in plant immunity.Frontiers in plant science · 2023Review
- Transcriptional Comparison of Genes Associated with Photosynthesis, Photorespiration, and Photo-Assimilate Allocation and Metabolic Profiling of Rice Species.International journal of molecular sciences · 2022Article
- Metabolic profiles in C3, C3-C4 intermediate, C4-like, and C4 species in the genus Flaveria.Journal of experimental botany · 2022Article
- Metabolite Profiling inMetabolites · 2021Article
- HPlant molecular biology · 2021Article
- A cyanobacterial photorespiratory bypass model to enhance photosynthesis by rerouting photorespiratory pathway in CScientific reports · 2020Article
- Faster Removal of 2-Phosphoglycolate through Photorespiration Improves Abiotic Stress Tolerance of Arabidopsis.Plants (Basel, Switzerland) · 2019Article
- Redox-Regulation of Photorespiration through Mitochondrial Thioredoxin o1.Plant physiology · 2019Article
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Authors and funding
10 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Photorespiration is indispensable for oxygenic photosynthesis since it detoxifies and recycles 2-phosphoglycolate (2PG), which is the primary oxygenation product of Rubisco. However, C4 plant species typically display very low rates of photorespiration due to their efficient biochemical carbon-concentrating mechanism. Thus, the broader relevance of photorespiration in these organisms remains unclear. In this study, we assessed the importance of a functional photorespiratory pathway in the C4 plant Flaveria bidentis using knockdown of the first enzymatic step, namely 2PG phosphatase (PGLP). The isolated RNAi lines showed strongly reduced amounts of PGLP protein, but distinct signs of the photorespiratory phenotype only emerged below 5% residual PGLP protein. Lines with this characteristic were stunted in growth, had strongly increased 2PG content, exhibited accelerated leaf senescence, and accumulated high amounts of branched-chain and aromatic amino acids, which are both characteristics of incipient carbon starvation. Oxygen-dependent gas-exchange measurements consistently suggested the cumulative impairment of ribulose-1,5-bisphosphate regeneration with increased photorespiratory pressure. Our results indicate that photorespiration is essential for maintaining high rates of C4 photosynthesis by preventing the 2PG-mediated inhibition of carbon utilization efficiency. However, considerably higher 2PG accumulation can be tolerated compared to equivalent lines of C3 plants due to the differential distribution of specific enzymatic steps between the mesophyll and bundle sheath cells.
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