Journal
FRONTIERS IN PLANT SCIENCE
Volume 6, Issue -, Pages 1-13Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2015.00073
Keywords
auxin response factor (ARF); auxin; auxin signaling; nodule formation; Sinorhizobium meliloti infection
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Funding
- National Natural Science Foundation of China [31401935, 31470407]
- Zhejiang Provincial Natural Science Foundation of China [LQ14C060001, LQ14C020002]
- Science and Technology Plan of Zhejiang province [2014C32090]
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Auxin response factors (ARFs) bind specifically to auxin response elements (AuxREs) in the promoters of down-stream target genes and play roles in plant responses to diverse environmental factors. Using the latest updated Medicago truncatula reference genome sequence, a comprehensive characterization and analysis of 24 MtARF (M. truncatula ARF) genes were performed. To uncover the basic information and functions of MtARF genes during symbiosis, we analyzed the expression patterns of MtARF genes during the early phase of Sinorhizobium meliloti infection. The systematic analysis indicated that changes in MtARF gene expression occur during these early stages of infection, suggesting a functional role in symbiosis. Furthermore, the roles of MtARF-mediated auxin signaling in symbiosis were tested in the infection resistant mutant (dmi3). The expression responses of MtARFs to S. meliloti infection were attenuated in the mutant compared to wild-type A17. In summary, our results show that changes in MtARF gene expression occur during the response to S. meliloti infection, suggesting that members of this family may have important roles in the symbiotic interaction.
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