Genetic Diversity Among Cold-Tolerant Fluorescent Pseudomonas Isolates from Indian Himalayas and Their Characterization for Biocontrol and Plant Growth-Promoting Activities

Negi, Yogesh Kumar; Prabha, Deepti; Garg, Shweta; Kumar, J.

doi:10.1007/s00344-010-9175-7

Cited by 29 publications

(17 citation statements)

References 26 publications

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“…Higher P . fluorescens group recovery in spring and winter is consistent with this species being psychrophilic, as a number of strains of this species have been found to be [ 15 , 26 , 42 , 43 ]. While the driver of the substantial decrease in P .…”

Section: Discussionsupporting

confidence: 59%

“…fluorescens groups [ 12 ]. Representatives from these groups have been isolated from a variety of habitats such as: soils and rhizospheres [ 13 – 15 ], drains[ 14 ], fresh and salt water [ 16 – 20 ], plants [ 21 , 22 ], and in clinical settings [ 23 – 25 ]. Nevertheless, despite substantial overlap in the environments from which they have been isolated, they differ in the resources they are able to use [ 26 , 27 ], in their temperature tolerances [ 26 , 28 ], and they have been found to differ in their relative abundances in some types of environments.…”

Section: Introductionmentioning

confidence: 99%

“…putida than P . fluorescens in their freshwater and wastewater samplings; and Negi et al [ 15 ] isolated substantially more P . fluorescens than P .…”

Section: Introductionmentioning

confidence: 99%

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Pseudomonas putida and Pseudomonas fluorescens Species Group Recovery from Human Homes Varies Seasonally and by Environment

2015

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By shedding light on variation in time as well as in space, long-term biogeographic studies can help us define organisms’ distribution patterns and understand their underlying drivers. Here we examine distributions of Pseudomonas in and around 15 human homes, focusing on the P. putida and P. fluorescens species groups. We describe recovery from 10,941 samples collected during up to 8 visits per home, occurring on average 2.6 times per year. We collected a mean of 141 samples per visit, from sites in most rooms of the house, from the surrounding yards, and from human and pet occupants. We recovered Pseudomonas in 9.7% of samples, with the majority of isolates being from the P. putida and P. fluorescens species groups (approximately 62% and 23% of Pseudomonas samples recovered respectively). Although representatives of both groups were recovered from every season, every house, and every type of environment sampled, recovery was highly variable across houses and samplings. Whereas recovery of P. putida group was higher in summer and fall than in winter and spring, P. fluorescens group isolates were most often recovered in spring. P. putida group recovery from soils was substantially higher than its recovery from all other environment types, while higher P. fluorescens group recovery from soils than from other sites was much less pronounced. Both species groups were recovered from skin and upper respiratory tract samples from healthy humans and pets, although this occurred infrequently. This study indicates that even species that are able to survive under a broad range of conditions can be rare and variable in their distributions in space and in time. For such groups, determining patterns and causes of stochastic and seasonal variability may be more important for understanding the processes driving their biogeography than the identity of the types of environments in which they can be found.

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Section: Discussionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Pseudomonas putida and Pseudomonas fluorescens Species Group Recovery from Human Homes Varies Seasonally and by Environment

2015

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“…However, before this smoke biotechnology can be used in agriculture, a number of questions need to be addressed including the impact it has on the soil microbial population ( Light et al, 2009) to ensure “healthy” soil. Diverse populations of PGPR provide a better resource for improving plant growth and disease management as each strain has a different mode of action and survival in changing environmental conditions ( Negi et al, 2011). Thus, the aim of the present study was to investigate the interactive effects of smoke‐derived compounds (smoke–water, KAR 1 , and TMB) and one selected PGPR ( Bacillus licheniformis ) by monitoring various aspects of plant growth.…”

Section: Introductionmentioning

confidence: 99%

Interactions between a plant growth‐promoting rhizobacterium and smoke‐derived compounds and their effect on okra growth

Papenfus

Kulkarni

Stirk

et al. 2015

J. Plant Nutr. Soil Sci.

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Plant growth‐promoting rhizobacteria (PGPR) are used in agriculture to improve crop yield. Crude smoke–water (made by bubbling plant‐derived smoke through water) stimulates germination and improves seedling growth. Some active compounds have been isolated from smoke with karrikinolide (KAR1) stimulating plant growth and trimethylbutenolide (TMB) being inhibitory. These smoke compounds have great potential in agriculture but their interaction with PGPR is unknown. In the present study, a two‐factorial pot trial with three replicates per treatment was designed to investigate the interactions between Bacillus licheniformis and two concentrations each of smoke–water, KAR1, and TMB on okra (Abelmoschus esculentus). Growth and physiological parameters (chlorophyll, carotenoid, protein, sugar and α‐amylase) of okra as well as bacterial abundance in the rhizosphere were measured after 5 weeks. Application of B. licheniformis and 10−7 M KAR1 significantly improved the shoot biomass and 10−7 M KAR1 also significantly improved leaf area of okra. However, when 10−7 M KAR1 was applied in combination with B. licheniformis, there was an antagonistic effect on plant growth. While TMB had a negative effect on plant growth, a combination treatment of TMB and B. licheniformis overcame the inhibitory effect of TMB resulting in plant growth similar to the control plants. All treatments had no effect on chlorophyll, carotenoid, protein and sugar concentrations, while α‐amylase activity was significantly elevated in okra root treated with 1:500 (v/v) smoke–water. Determining the rhizobacteria populations at harvest showed that all treatments had no significant effect on the rhizosphere microbial abundance. The modes of interaction between PGPR and smoke‐derived compounds need to be further elucidated.

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“…The combination of the fi ve isolates proved to be the best, with maximum disease reduction (93.33 %) and enhancement of various plant growth parameters. Among individual isolates, Pf-551 had the best performance for most of the parameters assessed (Negi et al 2011 ). Wahyudi et al ( 2011 ) examined 14 isolates from the soybean rhizosphere as pseudomonads spp.…”

Section: Pseudomonads As Potential Pgpr By Direct Mechanisms Under Fimentioning

confidence: 99%

Antifungal Compounds from Pseudomonads and the Study of Their Molecular Features for Disease Suppression Against Soil Borne Pathogens

Pandya

Saraf

2014

Plant Microbes Symbiosis: Applied Facets

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The identifi cation and biological and molecular characterization of Pseudomonas , a very versatile microbe with biocontrol potential, is of great interest for the modern and eco-compatible agriculture. The mechanisms of biocontrol by Pseudomonas include antibiotic production, siderophore production, and production of fungal cell wall-lysing enzymes and induced systemic resistance. Current genome analyses of biocontrol traits will likely lead to the development of novel tools for effective management of indigenous and inoculated pseudomonads as biocontrol agents and a better exploitation of their properties for sustainable agriculture. The chapter summarizes and discusses various studies of pseudomonads from the plant rhizosphere and their use for exploring disease management in integrated disease management (IDM) and the study of genome sequences of Pseudomonas spp.

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Genetic Diversity Among Cold-Tolerant Fluorescent Pseudomonas Isolates from Indian Himalayas and Their Characterization for Biocontrol and Plant Growth-Promoting Activities

Cited by 29 publications

References 26 publications

Pseudomonas putida and Pseudomonas fluorescens Species Group Recovery from Human Homes Varies Seasonally and by Environment

Pseudomonas putida and Pseudomonas fluorescens Species Group Recovery from Human Homes Varies Seasonally and by Environment

Interactions between a plant growth‐promoting rhizobacterium and smoke‐derived compounds and their effect on okra growth

Antifungal Compounds from Pseudomonads and the Study of Their Molecular Features for Disease Suppression Against Soil Borne Pathogens

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