2025-03-062025-03-062017-12BUENO, A.C. S. O. et al. Response of photosynthesis and chlorophyll a fluorescence in leaf scald-infected rice under influence of rhizobacteria and silicon fertilizer. Plant Pathology, [s. l.], v. 66, n. 9, p. 1487-1495, 2017. DOI: 10.1111/ppa.12690. Disponível em: https://bsppjournals.onlinelibrary.wiley.com/doi/10.1111/ppa.12690. Acesso em: 15 jan. 2025.0032-0862e- 1365-3059https://bsppjournals.onlinelibrary.wiley.com/doi/10.1111/ppa.12690Leaf scald caused by Monographella albescens reduces the photosynthetic area, causing yield losses in rice. This study investigated the efficacy of the rhizobacteria Burkholderia pyrrocinia (BRM-32113) and Pseudomonas fluorescens (BRM-32111), combined with silicon (Si) fertilization, to reduce lesion size and the area under the disease progress curve (AUDPC), as well as to minimize the negative effects on gas exchange, chlorophyll a fluorescence, chlorophyll content and the activity of oxidative stress enzymes. The experiment used a completely randomized design with four replications and seven treatments. Compared with plants only fertilized with Si, plants fertilized with Si and treated with BRM-32113 showed reductions of 22% in scald lesion expansion and 37% in AUDPC, a 27% increase in the rate of CO2 assimilation (A), a 33% decrease in the internal CO2 concentration (Ci), and a 40% increase in ascorbate peroxidase activity. It was therefore concluded that the combination of BRM-32113 with Si fertilization reduces the severity of leaf scald, protecting the photosynthetic apparatus, thus representing a sustainable method of reducing the loss of income caused by leaf scald in rice.engAcesso RestritoBurkholderia pyrrociniaChlorophyllGas-exchangeOxidative stressPseudomonas fluorescensRice leaf scaldArtigo10.1111/ppa.12690