Enhancement of alfalfa yield and quality by plant growth‐promoting rhizobacteria under saline‐alkali conditions

Liu, Jiali; Tang, Lu; Gao, Hong; Zhang, Miao; Guo, Changhong

doi:10.1002/jsfa.9185

Cited by 68 publications

(46 citation statements)

References 38 publications

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“…Moreover, no difference between the inoculated plants with both bacteria showed that either bacterium could increase dry weight, height, and leaf number under salinity. The reports showed in inoculated plants with bacteria, root length and nutrient absorption such as phosphor, potassium, and nitrogen (Babalola 2010), synthesis of auxins, cytokinins, and gibberellins (Glick et al 2007), growth rate, and dry mass production were higher than noninoculated plant under stress and control conditions (Gupta et al 2015;Xiao et al 2018;Liu et al 2019;Trdan et al 2019). Liu et al (2019) and Xiao et al (2018) suggested that inoculation with rhizomicrobiome increased significantly plant growth in alfalfa plants and also plant biomass was affected by the composition of the rhizomicrobiome, soil pH, N, P, and plant growth stage and species.…”

Section: Discussionmentioning

confidence: 99%

Salt-tolerant plant growth-promoting bacteria enhanced salinity tolerance of salt-tolerant alfalfa (Medicago sativa L.) cultivars at high salinity

et al. 2019

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Alfalfa (Medicago sativa L.) plant growth decreases when cultivated under salinity or irrigated with salty water. Inoculation with plant growth-promoting bacteria (PGPB) is a method for mitigating the harmful effects of salinity on plants growth. To investigate salt-tolerant PGPB with salt-tolerant and salt-sensitive alfalfa cultivar interactions under salinity, some physiological and agronomical aspects were investigated. The inoculated plants of alfalfa cultivars with Hartmannibacter. diazotrophicus and Pseudomonas sp. bacteria were compared with non-inoculated plants. Plants were grown in growth room and irrigated with tap water until 6-7 weeks, and then, salinity stress imposed by irrigating with tap water (control), 10 dS m −1 and 20 dS m −1 NaCl. Salinity reduced relative water content (RWC), membrane stability index (MSI), K + , photosynthesis rate (Pn) and stomatal conductance (gs), leaf number, height, and dry weight, and increased sodium in all cultivars. Inoculation of cultivars with both PGPB mitigated the negative effects of salinity on plants growth by increasing the root length and weight, nodule number, chlorophyll pigments, RWC, MSI, Pn, and gs. Chlorophyll pigments, plant height and leaf number, Na + , K + /Na + , and nodule number improved more pronounced through inoculating with Pseudomonas sp., whereas K + , carotenoids, and RWC improved more pronounced through H. diazotrophicus under salinity. The results showed inoculation with two bacteria improved growth performance in salt-tolerant and salt-sensitive cultivars under 10 dS m −1 , but at high salinity (20 dS m −1), inoculation was successful only in salt-tolerant alfalfa cultivars.

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Section: Discussionmentioning

confidence: 99%

Salt-tolerant plant growth-promoting bacteria enhanced salinity tolerance of salt-tolerant alfalfa (Medicago sativa L.) cultivars at high salinity

et al. 2019

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“…The visual appearance of leaves also revealed that Cd affected the overall morphology, whereas bacterial treatment could help the plant to produce healthier leaves. Recently, Enterobacter aerogenes was also reported to possess different PGP properties and to significantly enhance the overall growth, yield and quality of alfalfa, even under stress conditions …”

Section: Discussionmentioning

confidence: 99%

Root colonization by heavy metal resistant Enterobacter and its influence on metal induced oxidative stress on Cajanus cajan

2019

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BACKGROUND: Heavy metal resistant bacterium Enterobacter sp. C1D was evaluated for cadmium (Cd) mediated exopolysaccharide production, biofilm formation and legume root colonization ability under Cd stress to alleviate metal induced stress. RESULTS:The plant was sensitive to Cd (IC 50 3-4 g mL −1 ), whereas the bacterium showed high Cd tolerance (MIC 99 120 g mL −1 ). Confocal laser scanning microscopy of the Cajanus cajan roots showed heavy loads of green fluorescence protein labelled Enterobacter sp. C1D on the surface of plant root, specifically at the point of root hair/lateral root formation along with cortex, even under metal stress. The root colonizing ability of Enterobacter sp. C1D was not affected by the presence of Rhizobium and the bacteria could be observed after 30 days of incubation in soil. Various plant growth parameters, antioxidant metabolites and oxidative stress indicator were significantly influenced by bacterial treatment, which, overall, reduced the adverse effect of Cd. CONCLUSION: Heavy metal tolerant bacteria may be a good choice for the development of biofertilizers and may work well with the native soil microbes such as Rhizobium under the metal polluted soil. Soil experimentsSterilized soil was amended with 0 or 50 or 100 mg kg −1 of Cd and/or inoculated and incubated in a greenhouse for 30 days. Root length, shoot length, fresh weight, number of pods, number of seeds, dry weight of pods, chlorophyll, H 2 O 2 and malondialdehyde (MDA) content, cellular glutathione, and non-protein thiol, protein and antioxidant enzyme from leaf extract were estimated.

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“…So NaHCO 3 stress has become one of the major constraints to crop yield and agricultural sustainability [13]. Under the stress of NaHCO 3 , inoculation of Enterobacter aerogenes LJL-5 and Pseudomonas aeruginosa LJL-13 increases alfalfa yield and quality [14]. Application of Trichoderma asperellum decreases the infection incidence of pathogenic fungi and alleviates NaHCO 3 stress in poplar [15].…”

Section: Introductionmentioning

confidence: 99%

“…Among these, 669 enriched and 1296 depleted species were identified. The top 10 NaHCO 3 -responsive genera with highest number of species were Streptomyces (81), Pseudomonas (70), Bacillus(22), Rhizobium(22), Rhodococcus(19), Bradyrhizobium(17), Mycobacterium(17), Micromonospora(15), Pseudoalteromonas(14), and Sphingomonas(14). Based on the 16S rRNA amplicon sequencing, the genera Pseudomonas, Rhizobium, Bradyrhizobium, Mycobacterium, and Sphingomonas were still in response to NaHCO 3 tress (Additional file 4:Table S5).…”

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confidence: 99%

Metagenomic analysis of cucumber rhizospheric microbiome provides insights into NaHCO3 stress mitigation by Rheinheimera pacifica NYJ

et al. 2020

Preprint

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Background: NaHCO3 in soil leads to alkalinization and causes stress in plants, thus hindering agricultural sustainability. A strain NYJ was identified as Rheinheimera pacifica and applied into cucumber-planted soil to mitigate NaHCO3 stress in this study. We aimed to detect the taxonomy and functional potential of rhizospheric microbiome affected by NaHCO3 stress and NYJ application, obtaining NaHCO3-tolerant microbes and exploring one mechanism underlining NaHCO3 stress mitigation by NYJ application.Results: The strain NYJ grew well under 0.01-0.06 g L-1 NaHCO3 and had plant growth-promoting capacity. Application of NYJ into NaHCO3-contaminated and cucumber-planted soil improved plant growth, increased relative water contents and osmotic potential of leaves, and decreased malonaldehyde and hydrogen peroxide contents in seedlings, mitigating NaHCO3 stress in cucumber. In cucumber rhizospheric soil, Proteobacteria, Actinobacteria, and Bacteroidetes of microbes were dominant phyla with 69, 17, and 6% of total abundance. To respond to NaHCO3 stress, 669 species and 208 genera of microbes were enriched in rhizospheric soil, while 190 sodium ion-related genes, 1242 osmotic stress-related genes, and 121 other stress-related genes from microbial genera including Pseudomonas showed the increased abundances. Under NaHCO3 stress, 26 microbial genera were distributed in connectors, the interaction network of rhizospheric microbes was changed, and soil enzyme activities were decreased. When NYJ being applied into the NaHCO3-contaminated soil, 1327 species and 487 genera of microbes were enriched than those under NaHCO3 stress alone. Meantime, soil enzyme activities were increased, while 2238 symbiont- and immune-related genes and 2434 plant growth-promoting genes including 16 genes encoding chitinase had the elevated abundances in microbial genera. Moreover, NYJ negatively interacted with one bacterial genus and positively interacted with 3 microbial genera under NaHCO3 stress. As a result, 25 bacterial genera were distributed in connectors, and microbial interaction network in rhizospheric soil was different from the one caused by NaHCO3 stress alone.Conclusions: 669 NaHCO3-tolerant species and 208 NaHCO3-tolerant genera of microbes were identified. NYJ application affected microbial community structure and interaction network in rhizospheric soil, increased the abundances of genes related to symbiont, immune, and plant growth-promoting traits in microbes, and activated soil enzymes, thereby mitigating NaHCO3 stress in cucumber.1 These authors contributed equally to this work.

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Enhancement of alfalfa yield and quality by plant growth‐promoting rhizobacteria under saline‐alkali conditions

Cited by 68 publications

References 38 publications

Salt-tolerant plant growth-promoting bacteria enhanced salinity tolerance of salt-tolerant alfalfa (Medicago sativa L.) cultivars at high salinity

Salt-tolerant plant growth-promoting bacteria enhanced salinity tolerance of salt-tolerant alfalfa (Medicago sativa L.) cultivars at high salinity

Root colonization by heavy metal resistant Enterobacter and its influence on metal induced oxidative stress on Cajanus cajan

Metagenomic analysis of cucumber rhizospheric microbiome provides insights into NaHCO3 stress mitigation by Rheinheimera pacifica NYJ

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