Astacio, Juan DiegoRodríguez Pires, SilviaMelgarejo, PalomaDe Cal, AntonietaEspeso, Eduardo Antonio2025-04-292025-04-292025-03Astacio JD, Rodríguez-Pires S, Melgarejo P, De Cal A, Espeso EA. Differences in Behavior During Early Nectarine Infection Among Main Monilinia spp. Causing Brown Rot. Phytopathology® 2025;115:269–80. https://doi.org/10.1094/PHYTO-05-24-0159-R.0031-949X1943-768410.1094/phyto-05-24-0159-rhttps://hdl.handle.net/20.500.14352/119763Funding: Ministerio de Ciencia, Innovación y Universidades, Grant/Award Number: PRE2018-085721. Ministry of Universities and the European Union-NextGenerationEU, Grant/Award Number: “Margarita Salas” postdoctoral program. Agencia Estatal de Investigación, Grant/Award Number PID2020-115702RB-C21/AEI/10.13039/501100011033 ; Grant/Award Number: PID2021-124278OB-I00. Ministerio de Economía y Competitividad, Grant/Award Number: AGL2017-84389-C2-2-R.Brown rot is a disease that affects stone and pome fruit crops worldwide. It is caused by fungal members of the genus Monilinia, mainly M. fructicola, M. laxa, and M. fructigena. This study presents evidence that, despite having a very similar battery of cell wall-degrading enzymes, the three species behave differently during the early stages of infection, suggesting differences at the regulatory level, which could also explain the differences in host preference among the three species. We have shown that M. fructicola infection is accelerated by red light, and the first symptoms appear much earlier than in darkness or in the other two species. The overexpression of genes encoding for CAZymes, such as pme3, pme2, pg1, cel1, pnl1, and pnl2, as well as the necrosis factor nep2, can be associated with the etiology of Monilinia spp. In addition, we found that nep2 in M. fructigena lacks binding sites in its promoter sequence for the white-collar complex, which is the major transcription factor responsible for regulating photoreception processes in fungi. Finally, we found that AlphaFold models of the NEP1-like proteins present on the three Monilinia species predict proteins with a very high degree of similarity.engjournal articlehttps://doi.org/10.1094/PHYTO-05-24-0159-Rhttps://apsjournals.apsnet.org/doi/epdf/10.1094/PHYTO-05-24-0159-Rmetadata only access579.64581.2Brown rotCAZymesGene RegulationLight wavelengthNep2Nep-likeMicrobiología (Biología)Biología molecular (Biología)2417.09 Fitopatología3109.05 Microbiología