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Pseudomonas knackmussii MLR6, a rhizospheric strain isolated from halophyte, enhances salt tolerance in Arabidopsis thaliana
Author(s) -
Rabhi N.E.H.,
Silini A.,
CherifSilini H.,
Yahiaoui B.,
Lekired A.,
Robineau M.,
Esmaeel Q.,
Jacquard C.,
VaillantGaveau N.,
Clément C.,
Aït Barka E.,
Sanchez L.
Publication year - 2018
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/jam.14082
Subject(s) - halophyte , rhizobacteria , biology , arabidopsis thaliana , salinity , halophile , botany , horticulture , stomatal conductance , photosynthesis , rhizosphere , biochemistry , bacteria , ecology , genetics , mutant , gene
Aims The study aimed for evaluate the efficacy of Pseudomonas knackmussii MLR 6 on growth promotion, photosynthetic responses, pigment contents and gene expression of the plant model Arabidopsis thaliana under NaCl stress. Methods and Results The strain MLR 6 was isolated from the rhizopshere of the halophyte Salsola tetrandra collected from a natural saline Algerian soil. Results showed the ability of MLR 6 to induce plant growth‐promoting traits even under NaCl stress. The inoculation with MLR 6 improved the stomatal conductance, the transpiration rate, the total chlorophyll and carotenoid contents under salt stress. It conferred also an increase in fresh/dry weight as well as plant height. MLR 6 inoculation further provided a positive effect on cell membrane stability by reducing the electrolyte leakage and priming the ROS accumulation after the salt exposition. Additionally, the expression of NHX 1 , HKT 1 , SOS 2 and SOS 3 as well as SAG 13 and PR 1 was maintained in MLR 6‐bacterized plant at a similar level of controls. Conclusions The inoculation of A. thaliana with MLR 6 improves plant growth and reduces damages caused by salt stress. Significance and Impact of the Study The use of P. knackmussii MLR 6 appears as a promising strategy to improve the sustainable agriculture under saline conditions.