Journal
PLANT PHYSIOLOGY
Volume 159, Issue 4, Pages 1771-1786Publisher
OXFORD UNIV PRESS INC
DOI: 10.1104/pp.112.195370
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [30872005, 31170570]
- Alexander von Humboldt-Stifung/Foundation (Germany)
- German Science Foundation through the Poplar Research Group Germany [FOR496, Po362]
- Fundamental Research Funds for the Central Universities [JC2011-2]
- Foundation for the Supervisors of Beijing Excellent Doctoral Dissertations [YB20081002201]
- Beijing Natural Science Foundation [6112017]
- Ministry of Education, People's Republic of China [209084]
Ask authors/readers for more resources
Salt-induced fluxes of H+, Na+, K+, and Ca2+ were investigated in ectomycorrhizal (EM) associations formed by Paxillus involutus (strains MAJ and NAU) with the salt-sensitive poplar hybrid Populus x canescens. A scanning ion-selective electrode technique was used to measure flux profiles in non-EM roots and axenically grown EM cultures of the two P. involutus isolates to identify whether the major alterations detected in EM roots were promoted by the fungal partner. EM plants exhibited a more pronounced ability to maintain K+/Na+ homeostasis under salt stress. The influx of Na+ was reduced after short-term (50 mM NaCl, 24 h) and long-term (50 mM NaCl, 7 d) exposure to salt stress in mycorrhizal roots, especially in NAU associations. Flux data for P. involutus and susceptibility to Na+-transport inhibitors indicated that fungal colonization contributed to active Na+ extrusion and H+ uptake in the salinized roots of P. x canescens. Moreover, EM plants retained the ability to reduce the salt-induced K+ efflux, especially under long-term salinity. Our study suggests that P. involutus assists in maintaining K+ homeostasis by delivering this nutrient to host plants and slowing the loss of K+ under salt stress. EM P. x canescens plants exhibited an enhanced Ca2+ uptake ability, whereas short-term and long-term treatments caused a marked Ca2+ efflux from mycorrhizal roots, especially from NAU-colonized roots. We suggest that the release of additional Ca2+ mediated K+/Na+ homeostasis in EM plants under salt stress.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available