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    2. 海峡生命科学前沿论坛第一百四十六讲——Discovery of new factors in legume nodulation



      Date:  Oct  8th,2019

      VenueConference  Room 201

      TitleDiscovery  of new factors in legume nodulation

      Speaker:  Brett  J. FergusonIntegrative  Legume Research Group, School of Agriculture and Food  Sciences, University of Queensland


      We  use genetic, physiological and functional-genomic approaches to elucidate the  mechanisms driving the development and regulation of legume nodules, with a  primary focus on soybean. The host plant tightly regulates the number of nodules  it forms following rhizobia-inoculation (autoregulation of nodulation) or  nitrate-treatment (nitrogen-regulation of nodulation). Both processes commence  with the production of a novel root-derived signal. We recently identified genes  in soybean encoding CLAVATA3/ESR related (CLE) peptides that exhibit increased  expression following rhizobia inoculation (GmRIC1 and  GmRIC2)  or inhibitory nitrate treatment (GmNIC1).  Over-expression of these genes significantly reduces soybean nodule numbers. We  established that CLE peptides often require post-translational modification with  a triarabinose building block to exert their full activity. The rhizobia-induced  CLE peptides act systemically through the shoot, whereas the nitrate-induced CLE  peptide acts locally in the root. Interestingly, all three CLE peptides are  perceived by the same LRR receptor kinase, called Nodulation Autoregulation  Receptor Kinase (NARK). This perception results in the regulation of a microRNA,  which inhibits further nodule formation. We also isolated and phenotypically  characterized a new soybean line mutated in the paralogous gene of  GmNARK,  called GmCLAVATA1A.  Comparisons between the genetic sequences and genomic environments of  GmCLAVATA1A and  various orthologues of NARK revealed  a number of interesting similarities; however, the two soybean paralogues  function in divergent molecular pathways. Perception of the  nodulation-suppressive CLE peptides in the shoot leads to the regulation of  miR2111, which is transported to the root where it regulates the mRNA level of  TML to control nodule organogenesis.  In addition to the nodulation-suppression  CLE peptides, the complete CLE peptide-encoding gene families of soybean (84  genes), common bean (46 genes), Medicago  truncatula (52),  and Lotus  japonicus (53)  were identified and categorised, providing a platform to help  functionally-characterise these critical developmental factors.  Findings  relating to our progress in identifying and characterising the abovementioned  nodulation factors and novel CLE peptides will be presented.

      The  seminar will be delivered in English.

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