Plant growth-promoting effects of Hartmannibacter diazotrophicus on summer barley (Hordeum vulgare L.) under salt stress

2015 ◽  
Vol 95 ◽  
pp. 23-30 ◽  
Author(s):  
Christian Suarez ◽  
Massimiliano Cardinale ◽  
Stefan Ratering ◽  
Diedrich Steffens ◽  
Stephan Jung ◽  
...  
Keyword(s):  
Salt Stress ◽  
Hordeum Vulgare ◽  
Plant Growth ◽  
Hordeum Vulgare L ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Screening of plant growth promoting bacteria associated with barley plants (Hordeum vulgare L.) cultivated in South Brazil

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Andress P. Pontes ◽  
Rocheli de Souza ◽  
Camille E. Granada ◽  
Luciane M.P. Passaglia
Keyword(s):  
Hordeum Vulgare ◽  
Plant Growth ◽  
Tricalcium Phosphate ◽  
Future Application ◽  
Rrna Gene ◽  
Plant Growth Promoting Bacteria ◽  
Bacterial Strains ◽  
Hordeum Vulgare L ◽  
Plant Growth Promoting ◽  
Growth Promoting

The occurrence of associations between bacteria and plant roots may be beneficial, neutral or detrimental. Plant growth promoting (PGP) bacteria form a heterogeneous group of beneficial microorganisms that can be found in the rhizosphere, the root surfaces or in association with host plant. The aim of this study was to isolate and characterize PGP bacteria associated to barley plants (Hordeum vulgare L.) aiming a future application as agricultural inoculant. One hundred and sixty bacterial strains were isolated from roots or rhizospheric soil of barley based on their growth in nitrogen-free selective media. They were evaluated for their ability to produce indolic compounds (ICs) and siderophores, and to solubilize tricalcium phosphate inin vitro assays. Most of them (74%) were able to synthesize ICs in the presence of the precursor L-tryptophan, while 57% of the isolates produced siderophores in Fe-limited liquid medium, and 17% were able to solubilize tricalcium phosphate. Thirty-two isolates possessing different PGP characteristics were identified by partial sequencing of their 16S rRNA gene. Strains belonging to Cedecea andMicrobacterium genera promoted the growth of barley plants in insoluble phosphate conditions, indicating that these bacteria could be used as bioinoculants contributing to decrease the amount of fertilizers applied in barley crops.

Evaluating efficacy of plant growth promoting rhizobacteria and potassium fertilizer on spinach growth under salt stress

2020 ◽  
Vol 52 (4) ◽  
Author(s):  
Muhammad Zafar-Ul-Hye ◽  
Fiza Mahmood ◽  
Subhan Danish ◽  
Shahid Hussain ◽  
Mehreen Gul ◽  
...  
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Potassium Fertilizer ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1523 ◽  
Author(s):  
Alessandra Moncada ◽  
Filippo Vetrano ◽  
Alessandro Miceli
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Leafy Vegetables ◽  
Mineral Nutrient ◽  
Plant Growth Promoting Bacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Leaf Lettuce ◽  
Positive Effect ◽  
Nutrient Solutions

Mediterranean areas with intensive agriculture are characterized by high salinity of groundwater. The use of this water in hydroponic cultivations can lead to nutrient solutions with an electrical conductivity that overcomes the tolerance threshold of many vegetable species. Plant growth-promoting rhizobacteria (PGPR) were shown to minimize salt stress on several vegetable crops but the studies on the application of PGPR on leafy vegetables grown in hydroponics are rather limited and have not been used under salt stress conditions. This study aimed to evaluate the use of plant growth-promoting bacteria to increase the salt tolerance of leaf lettuce grown in autumn and spring in a floating system, by adding a bacterial biostimulant (1.5 g L−1 of TNC BactorrS13 a commercial biostimulant containing 1.3 × 108 CFU g−1 of Bacillus spp.) to mineral nutrient solutions (MNS) with two salinity levels (0 and 20 mM NaCl). Leaf lettuce plants showed a significant reduction of growth and yield under salt stress, determined by the reduction of biomass, leaf number, and leaf area. Plants showed to be more tolerant to salinity in autumn than in spring. The inhibition of lettuce plant growth due to salt stress was significantly alleviated by the addition of the bacterial biostimulant to the MNS, which had a positive effect on plant growth and fresh and dry biomass accumulation of the unstressed lettuce in both cultivation seasons, and maintained this positive effect in brackish MNS, with similar or even significantly higher values of morphologic, physiologic, and yield parameters than those recorded in control unstressed plants.

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