ArticleThe Plant cell2022
SlSPX1-SlPHR complexes mediate the suppression of arbuscular mycorrhizal symbiosis by phosphate repletion in tomato.
Article in The Plant cell, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
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30 citing papers in PubMed, 69 citations in OpenAlex.
- From invitation to eviction: How plants control arbuscular mycorrhizal symbiosis.Plant signaling & behavior · 2026Review
- SlMED25-SlPHR3-SlSPX2 module fine-tunes SlPHR3-mediated transcriptional activation of phosphate starvation response in tomato.Journal of integrative plant biology · 2026Article
- OsIDD7 integrates signaling networks for arbuscular mycorrhizal symbiosis.Nature communications · 2026Article
- Review
- Soil to Cytoplasm: The Mycorrhizal Phosphorus Express and Its Regulatory Steps.Journal of fungi (Basel, Switzerland) · 2026Review
- Article
- The SPX protein family in plants: from phosphate sensors to multifunctional signaling hubs.Stress biology · 2026Review
- Symbiotic phosphate transporter dynamics in rice expose functional plasticity of the arbuscules.Nature communications · 2026Article
- The Medicago SPX1/3-PHR2 network relays phosphate signaling to orchestrate root nodulation-dependent nitrogen acquisition by controlling flavonoid biosynthesis.Plant communications · 2026Article
- Beyond phosphate uptake: PT4/PT11 as key functional components linking phosphate acquisition, nutrient exchange, and arbuscule maintenance in arbuscular mycorrhizal symbiosis.Frontiers in plant science · 2026Review
- Starve or share? Phosphate availability shapes plant-microbe interactions.PLoS pathogens · 2025Article
- Overexpression of miR399d impairs arbuscular mycorrhizal symbiosis in tomato.Plant biotechnology journal · 2025Article
- Regulation of arbuscular mycorrhiza development by environmental stimuli: Many roads lead to strigolactones.PLoS pathogens · 2025Article
- Deciphering the tomato phosphate starvation response: Functional and transcriptional roles of SlPHR3 and SlPHR4.The Plant cell · 2025Article
- A cis-natural antisense RNA regulates alternative polyadenylation of SlSPX5 under Pi starvation in tomato.Nature communications · 2025Article
- Unravelling the Molecular Dialogue of Beneficial Microbe-Plant Interactions.Plant, cell & environment · 2025Review
- OsNLP3 and OsPHR2 orchestrate direct and mycorrhizal pathways for nitrate uptake by regulating NAR2.1-NRT2s complexes in rice.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- The Effect ofInternational journal of molecular sciences · 2025Article
- Cross-kingdom nutrient exchange in the plant-arbuscular mycorrhizal fungus-bacterium continuum.Nature reviews. Microbiology · 2024Review
- Genome-Wide Identification and Expression Analysis of SlNRAMP Genes in Tomato under Nutrient Deficiency and Cadmium Stress during Arbuscular Mycorrhizal Symbiosis.International journal of molecular sciences · 2024Article
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11 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Forming mutualistic symbioses with arbuscular mycorrhizae (AMs) improves the acquisition of mineral nutrients for most terrestrial plants. However, the formation of AM symbiosis usually occurs under phosphate (Pi)-deficient conditions. Here, we identify SlSPX1 (SYG1 (suppressor of yeast GPA1)/Pho81(phosphate 81)/XPR1 (xenotropic and polytropic retrovirus receptor 1) as the major repressor of the AM symbiosis in tomato (Solanum lycopersicum) under phosphate-replete conditions. Loss of SlSPX1 function promotes direct Pi uptake and enhances AM colonization under phosphate-replete conditions. We determine that SlSPX1 integrates Pi signaling and AM symbiosis by directly interacting with a set of arbuscule-induced SlPHR proteins (SlPHR1, SlPHR4, SlPHR10, SlPHR11, and SlPHR12). The association with SlSPX1 represses the ability of SlPHR proteins to activate AM marker genes required for the arbuscular mycorrhizal symbiosis. SlPHR proteins exhibit functional redundancy, and no defective AM symbiosis was detected in the single mutant of SlPHR proteins. However, silencing SlPHR4 in the Slphr1 mutant background led to reduced AM colonization. Therefore, our results support the conclusion that SlSPX1-SlPHRs form a Pi-sensing module to coordinate the AM symbiosis under different Pi-availability conditions.
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