Add like
Add dislike
Add to saved papers

Amelioration of nitrate uptake under salt stress by ectomycorrhiza with and without a Hartig net.

New Phytologist 2019 Februrary 13
Salt stress is an important environmental cue impeding poplar nitrogen nutrition. Here, we characterized the impact of salinity on proton-driven nitrate fluxes in ectomycorrhizal roots and the importance of Hartig net for nitrate uptake. We employed two Paxillus involutus strains for root colonization: MAJ, which forms typical ectomycorrhizal structures (mantle and Hartig net) and NAU, colonizing roots with a thin, loose hyphal sheath. Fungus-colonized and non-colonized Populus × canescens were exposed to NaCl and used to measure root surface pH, NO3 - flux and transcription of nitrate transporters (PcNRT1.1, 1.2, 2.1) and plasmalemma H+ -ATPases (PcHA4, 8, 11). Paxillus colonization enhanced root NO3 - uptake, decreased surface pH, and stimulated NRTs and HA4 of the host regardless the presence or absence of a Hartig net. Under salt stress, non-colonized roots exhibited strong net NO3 - efflux, whereas beneficial effects of fungal colonization on surface pH and H+ -ATPases prevented NO3 - loss. Inhibition of H+ -ATPases abolished NO3 - influx under all conditions. We found that stimulation of H+ -ATPases was crucial for the beneficial influence of ectomycorrhiza on NO3 - uptake, whereas the presence of a Hartig net was not required for improved NO3 - translocation. Mycorrhizas may contribute to host adaptation to salt-affected environments by keeping up NO3 - nutrition. This article is protected by copyright. All rights reserved.

Full text links

We have located links that may give you full text access.
Can't access the paper?
Try logging in through your university/institutional subscription. For a smoother one-click institutional access experience, please use our mobile app.

For the best experience, use the Read mobile app

Mobile app image

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app

All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.

By using this service, you agree to our terms of use and privacy policy.

Your Privacy Choices Toggle icon

You can now claim free CME credits for this literature searchClaim now

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app