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Joseph W. Kloepper - One of the best experts on this subject based on the ideXlab platform.

  • influence of Plant growth promoting Rhizobacteria on corn growth under different fertility sources
    Communications in Soil Science and Plant Analysis, 2018
    Co-Authors: Dexter B Watts, Joseph W. Kloepper, Allen H Torbert
    Abstract:

    ABSTRACTA greenhouse study was conducted to evaluate the effects of Plant Growth-Promoting Rhizobacteria (PGPR) on root establishment and biomass production of corn (Zea mays L.) using three fertility sources (poultry litter (PL), biosolids, and urea). Applying PL significantly improved root morphological parameters and increased Plant biomass at the V4, V6, and VT growth stages when compared to the other fertility sources. At the V4 stage, PGPR stimulated root growth and enhanced aboveground biomass with urea and PL, while no differences were observed with biosolids. At the V6 stage, PL, biosolids, and urea with PGPR significantly increased some growth parameters (e.g., Plant height, leaf area, and root morphology). However, at the VT stage, PGPR’s influence on Plant growth was minimal regardless of fertility source. Applying the fertility sources at 135 kg N ha−1 may have masked PGPR’s influence on corn growth as the Plants reached their later vegetative growth stages.

  • selection and assessment of Plant growth promoting Rhizobacteria for biological control of multiple Plant diseases
    Phytopathology, 2017
    Co-Authors: Ke Liu, John A Mcinroy, Molli M Newman, Joseph W. Kloepper
    Abstract:

    A study was designed to screen individual strains of Plant Growth-Promoting Rhizobacteria (PGPR) for broad-spectrum disease suppression in vitro and in Planta. In a preliminary screen, 28 of 196 strains inhibited eight different tested pathogens in vitro. In a secondary screen, these 28 strains showed broad spectrum antagonistic activity to six different genera of pathogens, and 24 of the 28 strains produced five traits reported to be related to Plant growth promotion, including nitrogen fixation, phosphate solubilization, indole-3-acetic acid production, siderophore production, and biofilm formation. In advanced screens, the 28 PGPR strains selected in vitro were tested in Planta for biological control of multiple Plant diseases including bacterial spot of tomato caused by Xanthomonas axonopodis pv. vesicatoria, bacterial speck of tomato caused by Pseudomonas syringae pv. tomato, damping-off of pepper caused by Rhizoctonia solani, and damping-off of cucumber caused by Pythium ultimum. In all, 5 of the 28...

  • biological control of meloidogyne incognita by spore forming Plant growth promoting Rhizobacteria on cotton
    Plant Disease, 2017
    Co-Authors: Ni Xiang, Joseph W. Kloepper, John A Mcinroy, Kathy S Lawrence, Patricia A Donald, Gary W Lawrence
    Abstract:

    In the past decade, increased attention has been placed on biological control of Plant-parasitic nematodes using various fungi and bacteria. The objectives of this study were to evaluate the potential of 662 Plant Growth-Promoting Rhizobacteria (PGPR) strains for mortality to Meloidogyne incognita J2 in vitro and for nematode management in greenhouse, microplot, and field trials. Results indicated that the mortality of M. incognita J2 by the PGPR strains ranged from 0 to 100% with an average of 39%. Among the PGPR strains examined, 212 of 662 strains (or 33%) caused significantly greater mortality percent of M. incognita J2 than the untreated control. Bacillus was the major genus initiating a greater mortality percentage when compared with the other genera. In subsequent trials, B. velezensis strain Bve2 reduced M. incognita eggs per gram of cotton root in the greenhouse trials at 45 days after Planting (DAP) similarly to the commercial standards Abamectin and Clothianidin plus B. firmus I-1582. Bacillus ...

  • Plant Growth-Promoting Rhizobacteria Stimulate Vegetative Growth and Asexual Reproduction of Kalanchoe daigremontiana
    The Plant Pathology Journal, 2015
    Co-Authors: Yong-soon Park, Kyungseok Park, Joseph W. Kloepper, Choong-min Ryu
    Abstract:

    Certain bacterial species associate with Plant roots in soil. The Plant Growth-Promoting Rhizobacteria (PGPR) stimulate Plant growth and yield in greenhouse and field. Here, we examined whether application of known bacilli PGPR strains stimulated growth and asexual reproduction in the succulent Plant Kalanchoe daigremontiana. Four PGPR strains B. amyloliquefaciens IN937a, B. cereus BS107, B. pumilus INR7, and B. subtilis GB03 were applied to young Plantlets by soil-drenching, and Plant growth and development was monitored for three months. Aerial growth was significantly stimulated in PGPR-inoculated Plants, which was observed as increases in Plant height, shoot weight, and stem width. The stimulated growth influenced Plant development by increasing the total number of leaves per Plant. Treatment with bacilli also increased the total root biomass compared with that of control Plants, and led to a 2-fold increase in asexual reproduction and Plantlet formation on the leaf. Collectively, our results firstly demonstrate that Bacillus spp. promote vegetative development of K. daigremontiana, and the enhanced growth stimulates asexual reproduction and Plantlet formation.

  • Plant growth promoting Rhizobacteria allow reduced application rates of chemical fertilizers
    Microbial Ecology, 2009
    Co-Authors: Anthony O Adesemoye, H A Torbert, Joseph W. Kloepper
    Abstract:

    The search for microorganisms that improve soil fertility and enhance Plant nutrition has continued to attract attention due to the increasing cost of fertilizers and some of their negative environmental impacts. The objectives of this greenhouse study with tomato were to determine (1) if reduced rates of inorganic fertilizer coupled with microbial inoculants will produce Plant growth, yield, and nutrient uptake levels equivalent to those with full rates of the fertilizer and (2) the minimum level to which fertilizer could be reduced when inoculants were used. The microbial inoculants used in the study were a mixture of Plant Growth-Promoting Rhizobacteria (PGPR) strains Bacillus amyloliquefaciens IN937a and Bacillus pumilus T4, a formulated PGPR product, and the arbuscular mycorrhiza fungus (AMF), Glomus intraradices. Results showed that supplementing 75% of the recommended fertilizer rate with inoculants produced Plant growth, yield, and nutrient (nitrogen and phosphorus) uptake that were statistically equivalent to the full fertilizer rate without inoculants. When inoculants were used with rates of fertilizer below 75% of the recommended rate, the beneficial effects were usually not consistent; however, inoculation with the mixture of PGPR and AMF at 70% fertility consistently produced the same yield as the full fertility rate without inoculants. Without inoculants, use of fertilizer rates lower than the recommended resulted in significantly less Plant growth, yield, and nutrient uptake or inconsistent impacts. The results suggest that PGPR-based inoculants can be used and should be further evaluated as components of integrated nutrient management strategies.

Habsah Hassan - One of the best experts on this subject based on the ideXlab platform.

  • Isolation and Identification of Plant Growth Promoting Rhizobacteria from Sago Palm (Metroxylon sagu Rottb.)
    'Penerbit Universiti Sains Malaysia', 2021
    Co-Authors: Samuel Lihan, Flonia Benet, Awang Ahmad Sallehin, Awang Husaini, Kasing Apun, Hairul Azman Roslan, Habsah Hassan
    Abstract:

    Plant growth promoting Rhizobacteria (PGPR) are strains of naturally occurring soil bacteria that live in close vicinity to the Plant’s rhizosphere region which possess the capability to augment host growth. This study was conducted to isolate and identify potential PGPR isolates indigenous to Metroxylon sagu, Rottb. rhizosphere. These potential isolates were characterised based on their beneficial Plant growth promoting (PGP) properties and identified by molecular analysis via 16S rDNA sequencing. A total of 18 isolates were successfully isolated, out of which five isolates were tested, and designated as (S1A, S2B, S3A, S3C and S42). Among the five isolates, two isolates (S2B and S3C) were found to produce high levels of indole-3-acetic acid (2.96 μg/mL and 10.31 μg/mL), able to fix nitrogen and show significant activity in phosphate solubilisation. The analysis of their sequences via National Center for Biotechnology Information (NCBI) suggested their close identity towards Lysinibacillus sphaericus and Bacillus thuringiensis. It can be concluded that the isolated PGPR possesses beneficial PGP attributes. It can be implied that the isolated PGPR are potential to be used as inoculant biofertilisers, beneficial for Metroxylon sagu, Rottb. growth. Hence, further studies need to be done to evaluate the effectiveness of the beneficial microbes towards sago seedlings growth, under pot experiment. Keywords: Plant Growth Promoting Rhizobacteria, Metroxylon sagu, Rottb., IAA, Phosphate Solubilisation, Biofertiliser

  • Isolation and Identification of Plant Growth Promoting Rhizobacteria from Sago Palm (Metroxylon sagu Rottb.)
    'Penerbit Universiti Sains Malaysia', 2021
    Co-Authors: Samuel Lihan, Flonia Benet, Awang Ahmad Sallehin, Awang Husaini, Kasing Apun, Hairul Azman Roslan, Habsah Hassan
    Abstract:

    Plant growth promoting Rhizobacteria (PGPR) are strains of naturally occurring soil bacteria that live in close vicinity to the Plant’s rhizosphere region which possess the capability to augment host growth. This study was conducted to isolate and identify potential PGPR isolates indigenous to Metroxylon sagu, Rottb. rhizosphere. These potential isolates were characterized based on their beneficial PGP properties and identified by molecular analysis via 16S rDNA sequencing. A total of 18 isolates were successfully isolated, out of which five isolates were tested, and designated as (S1A, S2B, S3A, S3C, and S42). Among the five isolates, two isolates (S2B and S3C) were found to produce high levels of indole-3-acetic acid (2.96 μg ml-1 and 10.31 μg ml-1), able to fix nitrogen and show significant activity in phosphate solubilization. The analysis of their sequences via NCBI suggested their close identity towards Lysinibacillus sphaericus and Bacillus thuringiensis. It can be concluded that the isolated PGPR possesses beneficial PGP attributes. It can be implied that the isolated PGPR are potential to be used as inoculant bio fertilizers, beneficial for Metroxylon sagu, Rottb. growth. Hence, further studies need to be done to evaluate the effectiveness of the beneficial microbes towards sago seedlings growth, under pot experiment

  • Isolation and Identification of Plant Growth Promoting Rhizobacteria from Sago Palm (Metroxylon sagu, Rottb.)
    'Penerbit Universiti Sains Malaysia', 2021
    Co-Authors: Lihan Samuel, Awang Ahmad Sallehin, Awang Husaini, Kasing Apun, Hairul Azman Roslan, Benet Flonia, Habsah Hassan
    Abstract:

    Plant growth promoting Rhizobacteria (PGPR) are strains of naturally occurring soil bacteria that live in close vicinity to the Plant’s rhizosphere region which possess the capability to augment host growth. This study was conducted to isolate and identify potential PGPR isolates indigenous to Metroxylon sagu, Rottb. rhizosphere. These potential isolates were characterised based on their beneficial Plant growth promoting (PGP) properties and identified by molecular analysis via 16S rDNA sequencing. A total of 18 isolates were successfully isolated, out of which five isolates were tested, and designated as (S1A, S2B, S3A, S3C and S42). Among the five isolates, two isolates (S2B and S3C) were found to produce high levels of indole-3-acetic acid (2.96 μg/mL and 10.31 μg/mL), able to fix nitrogen and show significant activity in phosphate solubilisation. The analysis of their sequences via National Center for Biotechnology Information (NCBI) suggested their close identity towards Lysinibacillus sphaericus and Bacillus thuringiensis. It can be concluded that the isolated PGPR possesses beneficial PGP attributes. It can be implied that the isolated PGPR are potential to be used as inoculant biofertilisers, beneficial for Metroxylon sagu, Rottb. growth. Hence, further studies need to be done to evaluate the effectiveness of the beneficial microbes towards sago seedlings growth, under pot experiment

Ahmad Saeed Bhatti - One of the best experts on this subject based on the ideXlab platform.

  • Perspective of Plant growth promoting Rhizobacteria (PGPR) containing ACC deaminase in stress agriculture
    Journal of Industrial Microbiology & Biotechnology, 2007
    Co-Authors: Muhammad Saleem, Sarfraz Hussain, Muhammad Arshad, Ahmad Saeed Bhatti
    Abstract:

    Ethylene is a gaseous Plant growth hormone produced endogenously by almost all Plants. It is also produced in soil through a variety of biotic and abiotic mechanisms, and plays a key role in inducing multifarious physiological changes in Plants at molecular level. Apart from being a Plant growth regulator, ethylene has also been established as a stress hormone. Under stress conditions like those generated by salinity, drought, waterlogging, heavy metals and pathogenicity, the endogenous production of ethylene is accelerated substantially which adversely affects the root growth and consequently the growth of the Plant as a whole. Certain Plant growth promoting Rhizobacteria (PGPR) contain a vital enzyme, 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which regulates ethylene production by metabolizing ACC (an immediate precursor of ethylene biosynthesis in higher Plants) into α-ketobutyrate and ammonia. Inoculation with PGPR containing ACC deaminase activity could be helpful in sustaining Plant growth and development under stress conditions by reducing stress-induced ethylene production. Lately, efforts have been made to introduce ACC deaminase genes into Plants to regulate ethylene level in the Plants for optimum growth, particularly under stressed conditions. In this review, the primary focus is on giving account of all aspects of PGPR containing ACC deaminase regarding alleviation of impact of both biotic and abiotic stresses onto Plants and of recent trends in terms of introduction of ACC deaminase genes into Plant and microbial species.

Osama A Abdalla - One of the best experts on this subject based on the ideXlab platform.

  • integration of chitosan and Plant growth promoting Rhizobacteria to control papaya ringspot virus and tomato chlorotic spot virus
    Archives of Phytopathology and Plant Protection, 2017
    Co-Authors: Osama A Abdalla, Shagufta Bibi, Shouan Zhang
    Abstract:

    AbstractPapaya ringspot virus-W (PRSV-W) and Tomato chlorotic spot virus (TCSV) are common viruses infecting vegetables in south Florida. Application of Plant Growth-Promoting Rhizobacteria (PGPR) ...

  • application of Plant growth promoting Rhizobacteria to control papaya ringspot virus and tomato chlorotic spot virus
    Archives of Phytopathology and Plant Protection, 2017
    Co-Authors: Osama A Abdalla, Shagufta Bibi, Shouan Zhang
    Abstract:

    AbstractPapaya ringspot virus (PRSV-W) and Tomato chlorotic spot virus (TCSV) are responsible for severe losses in cucurbits and tomato production in south Florida and other regions in the USA. Traditional chemicals are not effective to control these viruses. Using Plant Growth-Promoting Rhizobacteria (PGPR) may present an alternative to control these viruses. Results from this study demonstrated that applying mixtures of PGPR strains is more efficient to control PRSV-W and TCSV compared to individual PGPR strain only. The application method significantly affected the efficiency of PGPR to control PRSV-W and TCSV. The highest reduction in disease severity of both PRSV-W and TCSV occurred in case of soil drenching with PGPR, followed by root dipping and seed coating treatments. Application of PGPR mixtures of (IN937a & SE34) or (IN937a &, SE34 & T4) were the most efficient methods to control these viral diseases.

Shouan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • integration of chitosan and Plant growth promoting Rhizobacteria to control papaya ringspot virus and tomato chlorotic spot virus
    Archives of Phytopathology and Plant Protection, 2017
    Co-Authors: Osama A Abdalla, Shagufta Bibi, Shouan Zhang
    Abstract:

    AbstractPapaya ringspot virus-W (PRSV-W) and Tomato chlorotic spot virus (TCSV) are common viruses infecting vegetables in south Florida. Application of Plant Growth-Promoting Rhizobacteria (PGPR) ...

  • application of Plant growth promoting Rhizobacteria to control papaya ringspot virus and tomato chlorotic spot virus
    Archives of Phytopathology and Plant Protection, 2017
    Co-Authors: Osama A Abdalla, Shagufta Bibi, Shouan Zhang
    Abstract:

    AbstractPapaya ringspot virus (PRSV-W) and Tomato chlorotic spot virus (TCSV) are responsible for severe losses in cucurbits and tomato production in south Florida and other regions in the USA. Traditional chemicals are not effective to control these viruses. Using Plant Growth-Promoting Rhizobacteria (PGPR) may present an alternative to control these viruses. Results from this study demonstrated that applying mixtures of PGPR strains is more efficient to control PRSV-W and TCSV compared to individual PGPR strain only. The application method significantly affected the efficiency of PGPR to control PRSV-W and TCSV. The highest reduction in disease severity of both PRSV-W and TCSV occurred in case of soil drenching with PGPR, followed by root dipping and seed coating treatments. Application of PGPR mixtures of (IN937a & SE34) or (IN937a &, SE34 & T4) were the most efficient methods to control these viral diseases.