Bio-amelioration of saline soil using Aeluropus littoralis, arbuscular mycorrhizal fungus (AMF), and salt-resistant PGPB

Articles in Press

Document Type : Original Research

Authors
M. Zarei
E. Malekzadeh
A. Movahedi Naeini
Department of Soil Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
Abstract
This study aimed to evaluate the capability of the halophyte A. littoralis in symbiosis with Rhizophagus intraradices and Nocardia Halotolerans an indigenous bacterium of saline soils- on phytoextraction of Na under saline conditions. Salinity treatments included 0 (S0), 100 mM NaCl (S1), 200 mM NaCl (S2), 100 mM NaCl+50mM K2SO4 (S3), 200 mM NaCl+50mM K2SO4 (S4) levels. Plant fresh and dry weight, chlorophyll content decreased as salinity increased up to S2 level and increased thereafter. Plant root colonization in the inoculation and co-inoculation of AMF+SR-PGPB were similar. Compared to the S0 treatment, root colonization in the AMF group decreased by 23.5%, 32.6%, 13.5%, and 26.7% under S1, S2, S3, and S4 treatments, respectively. In the Bacteria+AMF group, the reduction was smaller, with decreases of 2.8%, 3.4%, and an increase of 6.8% and 1.4% under S1, S2, S3, and S4 treatments, respectively. These results indicate that co-inoculation with PGPB mitigated the negative effects of salinity on root colonization. The root and soil glomalin contents increased as salinity increased. Root glomalin in plants inoculated by AMF+SR-PGPB was more than in a single inoculation of AMF under salt stress. This study highlights the potential application of salt-tolerant bacteria and AMF as effective strategies for enhancing plant growth and productivity in saline environments, contributing to sustainable agricultural practices in affected regions.

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Available Online from 01 January 2024