Malate dynamics in symbiosis between Lotus japonicus and Mesorhizobium loti

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Symbiotic nitrogen fixation by intracellular rhizobia within legume root nodules requires the exchange of nutrients between host plant cells and their resident bacteria. While exchanged molecules imply nitrogen compounds, carbohydrate, and also various minerals, the knowledge on molecular basis of plant transporters that mediate those metabolite exchanges are still limited. In this study, I characterized two transporter families, ALMT and SWEET. One of LjALMT gene and LjSWEET gene express in nodule vascule bundles, and their transport activities for malate and sucrose were confirmed with Xenopus oocyte and FLET, respectively. The direct involvement of these transporters in nutrient transport into bacteroids was not observed, however, their functions in carbon dynamics in nodules were suggested.