Secrets of the fungus-specific potassium channel TOK family

Houdinet, Gabriella; Guerrero‐Galán, Carmen; Rose, Benjamin D.; Garcia, Kevin; Zimmermann, Sabine

doi:10.1016/j.tim.2022.11.007

Cited by 1 publication

(1 citation statement)

References 68 publications

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“…However, it is impossible to conclude further on their actual function in axenic vs. symbiotic conditions since no data on their substrate, specificity, as well as cellular, and sub‐cellular localization have been collected so far. Further work toward that path will shed light on the role these putative transporters have in fungal and plant nutrition, particularly because no K + transport systems from the HAK or TOK family were identified in P. ammoniavirescens genome (Garcia & Zimmermann, 2014; Houdinet et al, 2022), suggesting a more simplified ability for K + movement in Paxillaceae .…”

Section: Discussionmentioning

confidence: 99%

The ectomycorrhizal fungus Paxillus ammoniavirescens influences the effects of salinity on loblolly pine in response to potassium availability

Rose,

Dellinger,

Larmour

et al. 2024

Environmental Microbiology

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Salinity is an increasing problem in coastal areas affected by saltwater intrusion, with deleterious effects on tree health and forest growth. Ectomycorrhizal (ECM) fungi may improve the salinity tolerance of host trees, but the impact of external potassium (K+) availability on these effects is still unclear. Here, we performed several experiments with the ECM fungus Paxillus ammoniavirescens and loblolly pine (Pinus taeda L.) in axenic and symbiotic conditions at limited or sufficient K+ and increasing sodium (Na+) concentrations. Growth rate, biomass, nutrient content, and K+ transporter expression levels were recorded for the fungus, and the colonization rate, root development parameters, biomass, and shoot nutrient accumulation were determined for mycorrhizal and non‐mycorrhizal plants. P. ammoniavirescens was tolerant to high salinity, although growth and nutrient concentrations varied with K+ availability and increasing Na+ exposure. While loblolly pine root growth and development decreased with increasing salinity, ECM colonization was unaffected by pine response to salinity. The mycorrhizal influence on loblolly pine salinity response was strongly dependent on external K+ availability. This study reveals that P. ammoniavirescens can reduce Na+ accumulation of salt‐exposed loblolly pine, but this effect depends on external K+ availability.

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Section: Discussionmentioning

confidence: 99%