Isolation and Characterization of Three Plant Growth-Promoting Rhizobacteria for Growth Enhancement of Rice Seedling

Liu, Zeping; Zhang, Xiaolong; Li, Leibing; Xu, Ning; Hu, Yong; Wang, Chao; Shi, Yong; Li, Dongsheng

doi:10.1007/s00344-021-10393-4

Cited by 15 publications

(7 citation statements)

References 43 publications

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“…The rhizospheric isolates were also found to have tryptophan-dependent as well as independent pathways for indole-3-acetic acid production ( Figure 3 ). The presence of phytohormone-producing bacteria in the rice rhizosphere has been reported by earlier workers ( Liu et al., 2021a ). However, in the present study, bacteria with the tryptophan-dependent pathway were predominant.…”

Section: Discussionsupporting

confidence: 72%

“…The five isolates from this study belong to three genera: Brevibacterium, Klebsiella , and Bacillus ( Figure 1 ). Bacillus is one of the very promising growth-promoting and salt stress alleviating bacterial agents reported in different host plants ( Liu et al., 2021a ; Sahu et al., 2021b ). Brevibacterium frigoritolerance is reported as a salt stress alleviating bacteria from the wheat rhizosphere ( Huang et al., 2022 ).…”

Section: Discussionmentioning

confidence: 99%

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Salinity alleviator bacteria in rice (Oryza sativa L.), their colonization efficacy, and synergism with melatonin

Gupta

Tiwari²,

Shukla³

et al. 2023

Front. Plant Sci.

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In this study, rhizospheric and endophytic bacteria were tested for the alleviation of salinity stress in rice. Endophytic isolates were taken from previous studies based on their salt stress-alleviating traits. The rhizospheric bacteria were isolated from rice and screened based on salt tolerance and plant growth-promoting traits. Molecular identification indicated the presence of class Gammaproteobacteria, Bacillota, and Actinomycetia. Two-two most potential isolates each from rhizospheric and endophytic bacteria were selected for in planta trials. Results showed that microbial inoculation significantly improved germination and seedling vigor under elevated salinity. The confocal scanning laser microscopy showed higher bacterial colonization in inoculated rice roots than in control. Based on this experiment, rhizospheric bacteria Brevibacterium frigoritolerans W19 and endophytic Bacillus safensis BTL5 were selected for pot trial along with a growth-inducing compound melatonin 20 ppm. Inoculation of these two bacteria improved the levels of chlorophyll, proline, phenylalanine ammonia-lyase, catalase, superoxide dismutase, polyphenol oxidase, root-shoot length, and dry weight under elevated salt concentration. The gene expression studies showed modulation of SOD1, CATa, NHX1, and PAL1 genes by the bacterial strains and melatonin application. The inoculation was found to have additive effects with 20 ppm melatonin. This enhancement in dry matter accumulation, compatible solute production, and oxidative stress regulation could help plants in mitigating the ill effects of high salinity. Exploring such a combination of microbes and inducer molecules could be potentially useful in developing stress-alleviating bioformulations.

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Section: Discussionsupporting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Salinity alleviator bacteria in rice (Oryza sativa L.), their colonization efficacy, and synergism with melatonin

Gupta

Tiwari²,

Shukla³

et al. 2023

Front. Plant Sci.

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“…The growth promotion capacity of P. megaterium in various crops, such as rice, is better known [ 21 ]. Among the main growth promotion mechanisms described, the solubilization of phosphates by organic acids is reported [ 22 ], the production of auxins and cytokinins [ 23 ], as well as the control of phytopathogens, from the production of antifungals, volatile compounds, and inactivation of acyl-homoserine lactones (quorum quenching) [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Co-Inoculation of Endophytes Bacillus siamensis TUR07-02b and Priestia megaterium SMBH14-02 Promotes Growth in Rice with Low Doses of Nitrogen Fertilizer

Ríos-Ruiz

Tuanama-Reátegui

Huamán-Córdova

et al. 2023

Plants

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Multiple biotic and abiotic factors influence rice cultivation. These factors limit productivity and yield, as well as an irrational use of agrochemicals in rice cultivation. A sustainable alternative is using selected growth-promoting microorganisms to increase nutritional efficiency. In the present study, the direct mechanisms of growth promotion in two strains of Bacillus, three strains of Priestia, and two strains of Burkholderia endophytes of rice were characterized. Bacillus siamensis TUR07-02b and Priestia megaterium SMBH14-02 were selected to promote Oryza sativa var’s growth. “Bellavista” was used at different doses (50, 75, and 100%) of mineral nitrogen (N) using a randomized block design by quintuplicate. Both strains, SMBH14-02 and TUR07-02b, presented outstanding promoter characteristics, including auxin production (123.17 and 335.65 μg mL−1, respectively) and biological nitrogen fixation capacity. Similarly, B. siamensis TUR07-02b could solubilize phosphate-Ca (20.94 μg mL−1), cellulases, and pectinases. Under greenhouse conditions, co-inoculated plants receiving 75% of the total dose of mineral nitrogen showed increased agronomic parameters in relation to panicle length, grains per panicle, grain yield, and harvest index by 25.0, 30.7, 39.5, and 12.5%, respectively, compared to the 75% fertilized treatment without inoculation. The strains of B. siamensis TUR07-02b and P. megaterium SMBH14-02 are potential microbial resources in the formulation of new inoculants to reduce the use of nitrogenous fertilizers. Thus, agronomic validation of the inoculant consortium at the field level will be an essential step in providing an alternative for the sustainable management of rice cultivation and increased productivity of rice farmers in the San Martín region.

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“…They include Azospirillum lipoferum strain CRT1 (NCBI Accession number DQ438997.1), Azotobactor chroococcum strain AAU1013 (NCBI Accession number KF494188.1), Bacillus megaterium strain SZN4 (NCBI Accession number EU256396.1), and Bacillus sporothermodurans strain CB281428 (NCBI Accession number JX840987.1) ( Gopi et al., 2020 ). The PGPR isolates have been used as efficient plant growth promoters in many crops, including rice ( Bal et al., 2013 ; Liu et al., 2022 ). Our aim was to investigate whether they could also perform well under elevated CO 2 and at higher temperatures, and if so, how would they influence iron homeostasis and grain quality in rice.…”

Section: Methodsmentioning

confidence: 99%

Impact of biofertilisers on iron homeostasis and grain quality in the rice variety Uma under Elevated CO2

et al. 2023

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The diminishing nutritional quality of rice with increasing concentrations of atmospheric CO2 is currently a major global concern. The present study was designed with the objective of assessing the impact of biofertilisers on grain quality and iron homeostasis in rice under elevated CO2. A completely randomised design with four treatments ([KAU, POP (control), POP+Azolla, POP+PGPR, and POP+AMF]), each replicated three times under ambient and elevated CO2 conditions, was followed. The analysed data revealed that yield, grain quality, and iron uptake and translocation were modified in an unfavourable manner under elevated CO2, which was reflected in the lower quality and iron content of the grains. The response of iron homeostasis in the experimental plants to the application of biofertilisers, especially plant-growth-promoting rhizobacteria (PGPR), under elevated CO2 strongly suggests the possibility of utilising them for designing iron management strategies for achieving higher quality in rice.

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Isolation and Characterization of Three Plant Growth-Promoting Rhizobacteria for Growth Enhancement of Rice Seedling

Cited by 15 publications

References 43 publications

Salinity alleviator bacteria in rice (Oryza sativa L.), their colonization efficacy, and synergism with melatonin

Salinity alleviator bacteria in rice (Oryza sativa L.), their colonization efficacy, and synergism with melatonin

Co-Inoculation of Endophytes Bacillus siamensis TUR07-02b and Priestia megaterium SMBH14-02 Promotes Growth in Rice with Low Doses of Nitrogen Fertilizer

Impact of biofertilisers on iron homeostasis and grain quality in the rice variety Uma under Elevated CO2

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