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PLANTS INTERACTING WITH OTHER ORGANISMS

Genomic Inventory and Transcriptional Analysis of Medicago truncatula Transporters^1,[W],[OA]

Genetics and Developmental Biology Program, Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia 26506 (V.A.B.); Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401 (V.A.B., H.L., X.D., J.H., R.K., I.T.-J., Y.T., P.X.Z., M.K.U.); Max Planck Institute of Molecular Plant Physiology, 14476 Golm, Germany (M.W.); Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York 14853 (S.K.G., M.J.H.)

Transporters move hydrophilic substrates across hydrophobic biological membranes and play key roles in plant nutrition, metabolism, and signaling and, consequently, in plant growth, development, and responses to the environment. To initiate and support systematic characterization of transporters in the model legume Medicago truncatula, we identified 3,830 transporters and classified 2,673 of these into 113 families and 146 subfamilies. Analysis of gene expression data for 2,611 of these transporters identified 129 that are expressed in an organ-specific manner, including 50 that are nodule specific and 36 specific to mycorrhizal roots. Further analysis uncovered 196 transporters that are induced at least 5-fold during nodule development and 44 in roots during arbuscular mycorrhizal symbiosis. Among the nodule- and mycorrhiza-induced transporter genes are many candidates for known transport activities in these beneficial symbioses. The data presented here are a unique resource for the selection and functional characterization of legume transporters.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Michael K. Udvardi (mudvardi{at}noble.org).

^[W] The online version of this article contains Web-only data.

^[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.109.148684

^* Corresponding author; e-mail mudvardi{at}noble.org.

Received October 1, 2009; accepted December 15, 2009; published December 18, 2009.