Biochemistry, Genetics and Molecular Biology
2 years ago

Unlocking Plant Enzyme Key to Boosting Crop Yield and Nutrition

Plant Cell & Environment
Pyrroline‐5‐carboxylate dehydrogenase is an essential enzyme for proline dehydrogenase function during dark‐induced senescence in <i>Arabidopsis thaliana</i>
Yao Zheng, Cécile Cabassa‐Hourton, Séverine Planchais, Emilie Crilat, Gilles Clément, Matthieu Dacher, Nina Durand, Marianne Bordenave-Jacquemin, Anne Guivarc’h, Corentin Dourmap, Pierre Carol, Sandrine Lebreton, Arnould Savouré

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Leaf senescence involves breaking down amino acids to recycle nutrients, with key reactions happening in mitochondria. Proline and arginine metabolism are linked through the intermediate P5C. In Arabidopsis, ProDH and P5CDH enzymes are crucial for proline breakdown. Mutants lacking P5CDH showed faster metabolic changes during senescence, accumulating more P5C and proline. Reduced ProDH activity was observed in P5CDH mutants, suggesting P5C levels influence amino acid pathways during senescence.