During arbuscular mycorrhizal (AM) symbiosis, the plant gains access to phosphate (Pi) and nitrogen delivered by its fungal symbiont. Transfer of mineral nutrients occurs at the interface between branched hyphae called arbuscules and root cortical cells. In Medicago truncatula, a Pi transporter, PT4, is required for symbiotic Pi transport, and in pt4, symbiotic Pi transport fails, arbuscules degenerate prematurely, and the symbiosis is not maintained. Premature arbuscule degeneration (PAD) is suppressed when pt4 mutants are nitrogen-deprived, possibly the result of compensation by PT8, a second AM-induced Pi transporter. However, PAD is also suppressed in nitrogen-starved pt4 pt8 double mutants, negating this hypothesis and furthermore indicating that in this condition, neither of these symbiotic Pi transporters is required for symbiosis. In M. truncatula, three AMT2 family ammonium transporters are induced during AM symbiosis. To test the hypothesis that suppression of PAD involves AMT2 transporters, we analyzed double and triple Pi and ammonium transporter mutants. ATM2;3 but not AMT2;4 was required for suppression of PAD in pt4, while AMT2;4, but not AMT2;3, complemented growth of a yeast ammonium transporter mutant. In summary, arbuscule life span is influenced by PT4 and ATM2;3, and their relative importance varies with the nitrogen status of the plant.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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Evidence ID | Analyze ID | File | Description |
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