Reference Report for AP20210617.1
| Title: | Soybean SAT1 (Symbiotic Ammonium Transporter 1) encodes a bHLH transcription factor involved in nodule growth and NH4+ transport |
| Authors: | Chiasson, D.M., Loughlin, P.C., Mazukiewicz, D., Mohammadidehcheshmeh, M., Fedorova, E.E., Okamoto, M., McLean, E., Glass, A.M.D., Smith, S.E., Bisseling, T., Tyerman, S.D., Day, D.A., Kaiser, B.N. |
| Source: | Chiasson et al. 2014 PNAS, 13:4814-4819 |
| Abstract: | Glycine maxsymbiotic ammonium transporter 1 was first documented as a putative ammonium (NH4+) channel localized to the symbiosome membrane of soybean root nodules. We show thatGlycine maxsymbiotic ammonium transporter 1 is actually a membrane-localized basic helixloophelix (bHLH) DNA-binding transcription factor now renamedGlycine maxbHLH membrane 1 (GmbHLHm1). In yeast, GmbHLHm1 enters the nucleus and transcriptionally activates a unique plasma membrane NH4+channelSaccharomyces cerevisiaeammonium facilitator 1. Ammonium facilitator 1 homologs are present in soybean and other plant species, where they often share chromosomal microsynteny withbHLHm1loci. GmbHLHm1 is important to the soybean rhizobium symbiosis because loss of activity results in a reduction of nodule fitness and growth. Transcriptional changes in nodules highlight downstream signaling pathways involving circadian clock regulation, nutrient transport, hormone signaling, and cell wall modification. Collectively, these results show that GmbHLHm1 influences nodule development and activity and is linked to a novel mechanism for NH4+transport common to both yeast and plants. |
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