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The 'photosynthetic C pathway' links carbon assimilation and growth in California poplar. | LitMetric

AI Article Synopsis

Article Abstract

Although primarily studied in relation to photorespiration, serine metabolism in chloroplasts may play a key role in plant CO fertilization responses by linking CO assimilation with growth. Here, we show that the phosphorylated serine pathway is part of a 'photosynthetic C pathway' and demonstrate its high activity in foliage of a C tree where it rapidly integrates photosynthesis and C metabolism contributing to new biomass via methyl transfer reactions, imparting a large natural C-depleted signature. Using CO-labelling, we show that leaf serine, the S-methyl group of leaf methionine, pectin methyl esters, and the associated methanol released during cell wall expansion during growth, are directly produced from photosynthetically-linked C metabolism, within minutes of light exposure. We speculate that the photosynthetic C pathway is highly conserved across the photosynthetic tree of life, is responsible for synthesis of the greenhouse gas methane, and may have evolved with oxygenic photosynthesis by providing a mechanism of directly linking carbon and ammonia assimilation with growth. Although the rise in atmospheric CO inhibits major metabolic pathways like photorespiration, our results suggest that the photosynthetic C pathway may accelerate and represents a missing link between enhanced photosynthesis and plant growth rates during CO fertilization under a changing climate.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11549359PMC
http://dx.doi.org/10.1038/s42003-024-07142-0DOI Listing

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