Proton (H+) flux signature for the presymbiotic development of the arbuscular mycorrhizal fungi.

The New Phytologist
Alessandro C RamosJosé A Feijó

Abstract

Ion dynamics are important for cell nutrition and growth in fungi and plants. Here, the focus is on the relationship between the hyphal H(+) fluxes and the control of presymbiotic growth and host recognition by arbuscular mycorrhizal (AM) fungi. Fluxes of H(+) around azygopores and along lateral hyphae of Gigaspora margarita during presymbiotic growth, and their regulation by phosphate (P) and sucrose (Suc), were analyzed with an H(+)-specific vibrating probe. Changes in hyphal H(+) fluxes were followed after induction by root exudates (RE) or by the presence Trifolium repens roots. Differential sensitivity to P-type ATPase inhibitors (orthovanadate or erythrosin B) suggests an asymmetric distribution or activation of H(+)-pump isoforms along the hyphae of the AM fungi. Concentration of P and Suc affected the hyphal H(+) fluxes and growth rate. However, further increases in H+ efflux and growth rate were observed when the fungus was growing close to clover roots or pretreated with RE. The H(+) flux data correlate with those from polarized hyphal growth analyses, suggesting that spatial and temporal alterations of the hyphal H(+)fluxes are regulated by nutrient availability and might underlie a pH signaling elicitation by host R...Continue Reading

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Citations

Mar 19, 2016·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Tancredo Augusto Feitosa de SouzaHelena Freitas
Oct 2, 2009·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Pedro T LimaElio Sucena
Aug 26, 2009·Plant Signaling & Behavior·Alessandro C RamosJosé A Feijó
Jun 1, 2017·Microbial Ecology·Tancredo Augusto Feitosa de SouzaAline da Silva Sandim
Jan 24, 2018·Biology Open·Antônio Jesus Dorighetto CogoAnna L Okorokova-Façanha
Aug 21, 2018·International Journal of Microbiology·Gabriela C V BardValdirene M Gomes
Aug 10, 2019·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Tancredo Augusto Feitosa de SouzaHelena Freitas

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