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Manganese (Mn) is an important micronutrient element required for plant growth and development, playing catalytic roles in enzymes, membranes and DNA replication. The tea plant ( Camellia sinensis ) is able to accumulate high concentration of Mn without showing signs of toxicity, but the molecular mechanisms underlying this remain largely unknown. In this study, the  C. sinensis  cultivar ‘LJCY’ had higher Mn tolerance than cultivar ‘YS’, because chlorophyll content reduction was lower under the high Mn treatment. Proteomic analysis of the leaves revealed that  C. sinensis  Metal Tolerance Protein 8 (CsMTP8) accumulated in response to Mn toxicity in cultivar ‘LJCY’. The gene encoding CsMTP8, designated as  CsMTP8  was also isolated, and its expression enhanced Mn tolerance in  Saccharomyces cerevisiae . Similarly, the overexpression of  CsMTP8  in  Arabidopsis thaliana  increased plant tolerance and reduced Mn accumulation in plant tissues under excess Mn conditions. Subcellular localization analysis of green florescence fused protein indicated that CsMTP8 was localized to the plasma membranes. Taken together, the results suggest that CsMTP8 is a Mn-specific transporter, which is localized in the plasma membrane, and transports excess Mn out of plant cells. The results also suggest that it is needed for Mn tolerance in shoots.

Metal transport protein 8 in Camellia sinensis confers superior manganese tolerance when expressed in yeast and Arabidopsis thaliana