Drought accentuates the role of mycorrhiza in phosphorus uptake

0547080 - MBÚ 2022 RIV GB eng J - Journal Article
Püschel, David - Bitterlich, M. - Rydlová, J. - Jansa, Jan
Drought accentuates the role of mycorrhiza in phosphorus uptake.
Soil Biology and Biochemistry. Roč. 157, JUN 2021 (2021), č. článku 108243. ISSN 0038-0717
R&D Projects: GA ČR(CZ) GA17-12166S
Institutional support: RVO:61388971
Keywords : Arbuscular mycorrhizal fungi * Drought stress * Isotopic labeling * Medicago truncatula * Phosphorus uptake * Radiophosphorus * Rhizophagus irregularis 'PH5' * Soil moisture gradient
OECD category: Microbiology
Impact factor: 8.546, year: 2021
Method of publishing: Open access with time embargo
https://www.sciencedirect.com/science/article/pii/S0038071721001164?via%3Dihub

Arbuscular mycorrhizal fungi (AMF) greatly facilitate uptake of phosphorus (P) by most plant species. Whether or how this changes if water becomes limiting remained little explored. Medicago truncatula plants were grown in previously sterilized cultivation substrate and inoculated or not with AMF isolate Rhizophagus irregularis 'PH5' (M or NM, respectively) in two-compartment rhizoboxes. The compartments were separated or not with root-excluding meshes. A 15-step soil moisture gradient (maintained over 5 weeks) spanned generous water supply through strong water deficiency. Two radioisotopes (P-33 and P-32) were injected into the plant and distant compartments, respectively, to distinguish cumulative and immediate-term plant P uptake from either of the compartments at each moisture level. M plants were larger than NM plants at high and medium moisture levels and accumulated markedly more P throughout the whole gradient. The immediate-term P uptake did not differ between M and NM plants at high moisture, but at medium and low moistures, M plants acquired significantly more P-33 than NM plants, even after accounting for differences in root biomass. Increased immediate-term P uptake by M plants grown under medium and low substrate moistures was probably due to complementary effect of direct hyphal uptake and indirect alterations of substrate hydraulic properties by AMF. This research illustrates that AMF remain functional part of plants even under severe drought stress and thus they should be considered when plant functioning under water deficiency is to be fully understood.
Permanent Link: http://hdl.handle.net/11104/0323422