Abstract
ABSTRACT Plant growth-promoting bacteria (PGPB) and silicon (Si) can augment salinity tolerance in plants. In this study, 25 potential PGPB were isolated from alfalfa rhizosphere and screened for their ability to synthesize indole-3-acetic acid, 1-aminocyclopropane-1-carboxylate deaminase, and solubilize tricalcium phosphate. Two promising strains were tentatively identified as Pseudomonas pseudoalcaligenes (KB-10) and P. putida (KB-25) based on phenotypic, biochemical and 16S rRNA gene phylogeny. Subsequently, a pot experiment was conducted to evaluate the effectiveness of KB-10 and KB-25 treatment, alone or in combination with Si fertilizer, in alleviating salinity stress in coriander. The results showed that treatment with PGPB strains and/or Si significantly increased relative water content, concentrations of photosynthetic pigments, peroxidase activity, total biomass, salt tolerance index, and reduced salt-induced total phenolic contents. Overall data suggested that the combined application of PGPB and Si fertilizer could be a feasible and effective approach to improve growth and salinity tolerance in coriander.
Highlights
Salinity is one of the major abiotic factors that severely affects the soil quality of agricultural lands and limits crop productivity worldwide (Muchate et al 2016)
Isolation and characterization for plant growthpromoting traits of bacteria In the present study, we isolated a total of 25 potential Plant growth-promoting bacteria (PGPB) strains (KB-1 to KB-25) from the rhizosphere of alfalfa plants growing at the salt-affected farmland in Jeddah, Saudi Arabia
We observed no significant changes in the synthesis of indole-3-acetic acid (IAA) and ACC deaminase by both isolates grown under 5% NaCl stress
Summary
Salinity is one of the major abiotic factors that severely affects the soil quality of agricultural lands and limits crop productivity worldwide (Muchate et al 2016). Soil salinity triggers osmotic and ionic stresses that can lead to secondary stresses, for example, nutritional imbalances, and oxidative stress resulted due to the generation of reactive oxygen species (ROS) such as hydrogen peroxide (H2O2), superoxide (O2·−) and hydroxyl (·OH) radicals in plants (Yang and Guo 2018) These stresses can detrimentally affect physiological, biochemical and molecular processes including water relations, transpiration, photosynthesis, cellular homeostasis, hormonal and enzymatic activities, and gene expression patterns in plants (Deinlein et al 2014; Yang and Guo 2018). Despite these tolerance mechanisms, salinity stress remarkably reduces growth and yields of many crop plants (Parida and Das 2005; Abdi et al 2016; Askari-Khorasgani et al 2017)
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