ABSTRACT
Peroxiporins are a sub-group of aquaporins responsible for transporting H2O2, which are present in microorganisms and plants. Certain aquaporins can transport water, H2O2, and other solutes such as nitrogen compounds, boric acid, and glycerol, but in different efficacies. H2O2 and, consequently, peroxiporins play an important role in plant resistance mechanisms against microbial invasion such as intermediate signaling, transport of virulence factors, regulation of the systemic acquired resistance pathway, hypersensitive response, cell wall fortification, and stomatal closure. The interaction between plants and microorganisms demonstrates an increased fitness in plants under biotic and abiotic stress. In the symbiosis with mycorrhiza, peroxiporins may contribute to enhance plant fitness against drought stress and nutrient uptake. While in plant pathogenic fungi it can influence pathogenesis, also in the symbiosis with rhizobia, nodule-specific peroxiporins might be involved. Future research on the function and efficacy of peroxiporins is required for the better understanding of plant-microbe interactions.
