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Polyols can serve as a means for the translocation of carbon skeletons and energy between source and sink organs as well as being osmoprotective solutes and antioxidants which may be involved in the resistance of some plants to biotic and abiotic stresses. Polyol/Monosaccharide transporter (PLT) proteins previously identified in plants are involved in the loading of polyols into the phloem and are reported to be located in the plasma membrane. The functions of PLT proteins in leguminous plants are not yet clear. In this study, a total of 14 putative  PLT  genes ( LjPLT1 - 14 ) were identified in the genome of  Lotus japonicus  and divided into 4 clades based on phylogenetic analysis. Different patterns of expression of  LjPLT  genes in various tissues were validated by qRT-PCR analysis. Four genes ( LjPLT3 ,  4 ,  11 , and  14 ) from clade II were expressed at much higher levels in nodule than in other tissues. Moreover, three of these genes ( LjPLT3 ,  4 , and  14 ) showed significantly increased expression in roots after inoculation with  Mesorhizobium loti . Three genes ( LjPLT1 ,  3 , and  9 ) responded when salinity and/or osmotic stresses were applied to  L .  japonicus . Transient expression of GFP-LjPLT fusion constructs in Arabidopsis and  Nicotiana benthamiana  protoplasts indicated that the LjPLT1, LjPLT6 and LjPLT7 proteins are localized to the plasma membrane, but LjPLT2 (clade IV), LjPLT3, 4, 5 (clade II) and LjPLT8 (clade III) proteins possibly reside in the Golgi apparatus. The results suggest that members of the  LjPLT  gene family may be involved in different biological processes, several of which may potentially play roles in nodulation in this nitrogen-fixing legume.

Heterogeneity in the expression and subcellular localization of POLYOL/MONOSACCHARIDE TRANSPORTER genes in Lotus japonicus