Sugar transporters in plant-beneficial endophytic fungus and plant-phytopathogenic nematode interactions

The transport of sugars, a product of photosynthesis, involves the distribution of carbohydrates from synthesis organs, such as leaves, to the tissues of demand organs such as roots, stems, flowers, fruits and seeds. Their mobilization occurs through the plasmodesmata or apoplast by means of membrane transporters, which are proteins encoded by the so-called sugar transporter genes. Their expression in plants is modified by the presence of microorganisms that colonize them. Studies on their expression in plantnematode interactions are relatively recent, and in plant-beneficial endophyte fungus interactions they have been carried out mainly with arbuscular mycorrhizal fungi. In this review, information on the current state of knowledge of sugar transporters in plantendophyte fungus and plant-nematode interactions is summarized.