Molecular mechanisms of high levels of L-ascorbic acid accumulation in chestnut rose fruits.

ABSTRACT: The fruit of chestnut rose (Rosa roxburghii Tratt.) contains exceptionally high levels of L-ascorbic acid (AsA) (∼1762 mg/100 g fresh weight), approximately 40-fold higher than those found in sweet orange (Citrus sinensis), which is well known for its high AsA content. However, the molecular mechanisms driving such high accumulation in chestnut rose remain unclear. Here, we report that the genes R. roxburghiiPECTIN METHYLESTERASE (RroxPME), D-GALACTURONATE REDUCTASE (RroxGalUR), and DEHYDROASCORBATE REDUCTASE 2 (RroxDHAR2) play crucial roles in AsA accumulation in chestnut rose fruit. By comparing R. roxburghii with the closely related Rosamultiflora, which has low AsA concentrations, we identified a 545-bp insertion in the promoter of RroxGalUR. We found that TRANSPARENT TESTA GLABRA 2 (R

SUBMITTER: Li Y 

PROVIDER: S-EPMC12365842 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature