Role of Fluorescent Pseudomonads in Plant Growth Promotion and Biological Control of Late Leaf Spot of Groundnut

Meena, B. L.; Marimuthu, T.; Velazhahan, R.

doi:10.1556/aphyt.41.2006.3-4.3

Cited by 12 publications

(11 citation statements)

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“…The bioactivity of P. fluorescens might be due to produces different types of antibiotics including active 2, 4 diacetylphloroglucinole (2, 4 DAPB), which control diseases and/or due to that P. fluorescens has several methods to control the disease such as production of antifungal compounds including siderophre production, nutrient competition and the induction of systemic resistance [25]. Also, [20] reported that the reduction in the infection by plant pathogens and the increase in the plant length and fresh weight of the treated plants might be due to P. fluorescens produces of indole acetic acid as a growth regulator as well as some antibiotic, i.e. pyrrolnitrin, pyoluterin and 2, 4 diacetyl phloroglucino.…”

Section: Discussionmentioning

confidence: 99%

“…Bacterial culture filtrate was sterilized using 0.25 µm syringe filter. The culture filtrate of the bioagents was added to PDA medium just before solidifycation in different proportions (20,30,40 and 60 %), shake well and poured into the Petri-dishes (20 ml/plate). After solidification the Petri-plates were inoculated with 5 mm.…”

Section: Effect Of the Culture Filtrate Of Bacterial Bioagents On Thementioning

confidence: 99%

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Bacterial Bioagents and Compost as Two Tools for Management of Eggplant Fusarium Wilt

Abada¹,

Attia²,

El-Fiki³

2018

FEM

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Isolation trials from the roots of wilted eggplant plants grown at five governorates yielded many fungal isolates.The isolates of the fungus F. oxysporum were selected to test their pathogenicity and Kalubia isolate was the most virulent one. The fungus was virulent to eggplant and no apparent infection was found in case of the other seven tested plants. Therefore, the fungus F. oxysporum named Fusarium oxysporum Schlecht. f. sp. melongenae Fomg. All the tested bioagents and compost tea caused significant reduction to the linear growth of F.o.f.sp. melongenae and the germinated conidiospores compared with control treatment. Adding the two tested bioagents, i.e. B. subtilis and P. fluorescens each alone or in combination to the infested soil with the causal pathogen resulted in significant reduction to eggplant wilt with significant increase to plant height as well as the number of fruits and their weight / plant compared with control treatment. Moreover, amending the soil with compost increased the efficiency of the two bioagents in reducing the disease and increasing the produced fruit yield compared with the clay soil only. In addition, the fungicide Topsin M-70 was the superior treatment in reducing the severity of the disease and increasing plant height and the produced fruit yield followed by the combination of B. subtilis and P. fluorescens. The total phenol compounds were greatly increased in the bacterial treated plants and compost as compared to the control (untreated plants with the bioagents) and those infested with the pathogen only.

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Section: Discussionmentioning

confidence: 99%

Section: Effect Of the Culture Filtrate Of Bacterial Bioagents On Thementioning

confidence: 99%

Bacterial Bioagents and Compost as Two Tools for Management of Eggplant Fusarium Wilt

Abada¹,

Attia²,

El-Fiki³

2018

FEM

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“…Ramamoorthy et al (2001) reported that the bioactivity of P. fluorescens might be due to produces different types of antibiotics including active 2, 4 diacetyl-phloroglucinole (2, 4 DAPB), which control diseases and/or due to that P. fluorescens has several methods to control the disease such as production of antifungal compounds including siderophre production, nutrient competition and the induction of systemic resistance. Sarnigute et al (1995) and Meena et al (2006) mentioned that the reduction in the infection by that plant pathogens and the increase in the plant length and fresh weight of the treated plants might be due to P. fluorescens produces indole acetic acid as a growth regulator as well as some antibiotic, i.e. pyrrolnitrin, pyoluterin and 2, 4 diacetyl phloroglucino.…”

Section: Discussionmentioning

confidence: 99%

Potentiality of Inducer Resistance Chemicals and Bioagents in Managing Lettuce Downy Mildew

Abada¹,

Attia²

2017

AJBIO

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Abstract:The tested inducer resistance chemicals (IRCs) bion (BTH), chitosan and salicylic acid as well as the bacterial bioagents Bacillus pumilus B. subtilis, B. thuringiensis and Pseudomonas fluorescens and the fungal bioagents Trichoderma album, T. harzianum and T. viride resulted in significant reduction to the germinated sporangia (conidia) of the fungus like Bremia lactucae Regel, the causal of lettuce downy mildew. This reduction was gradually increased by increasing the used concentration. The role of the tested IRCs and bioagents on management of the disease under greenhouse was evaluated. Under greenhouse conditions, spraying of lettuce plants artificially inoculted with the causal fungus like resulted in significant reduction to the severity of the disease compared with control treatment. Moreover, the IRC bion as well as P. fluorescens and T. harzianum were the most efficient treatments in this regard. Two field experiments were carried out during 2016/ 2017 growing season under natural infection by the disease to evaluate the efficacy of spraying of lettuce plants with any of the IRC bion and the bioagents P. fluorescens and T. harzianum on plants previously soaked or not in bion just before transplanting on the severity of the disease and weight of the grown plants. Data revealed that there was significant reduction to the severity of the disease with considerable increase to the average weight of each plant compared with control treatment due to sprying of these treatments. However, the fungicide Ridomil Gold MZ was the superior treatment in reducing the disease and increasing the weight of the foliage growth of lettuce plants. In addition, spraying of the IRC bion on plants soaked in bion just before transplanting ranked the second in this regarad followed by spraying of any of the two bioagents. Considerable increase in the activity of the oxidative reductive enzymes, i.e phenylalanine ammonia lyase (PAL), peroxidase (PO) and polyphenol oxidase (PPO), due to spraying of lettuce plants with bion, the bioagents P. fluorescens and T. harzianum as well as the fungicide Ridomil Gold MZ compared with unsprayed plants (control).

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“…Ramamoorthy et al(2001) mentioned that the treatment with biopreparation induce systemic resistance as the main mechanism of activity on a plant or might be due to P. fluorescens produce different types of antibiotics including active 2, 4 diacetyl-phloroglucinole (2,4 DAPB), which control diseases and/or due to that P. fluorescens has several methods to control the disease such as production of antifungal compounds including siderophre production, nutrient competition and the induction of systemic resistance. Moreover, Meena et al (2006) mentioned that the reduction in the infection by the plant pathogens and the increase in the plant length and fresh weight of the treated plants might be due to that P. fluorescens produces of indole acetic acid as a growth regulator as well as some antibiotic, i.e. pyrrolnitrin, pyoluterin and 2, 4 diacetyl phloroglucino.…”

Section: Discussionmentioning

confidence: 99%

Effect of Combination among Bioagents, Compost and Soil Solarization on Management of Strawberry Fusarium Wilt

Abada¹

2014

AJLS

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Sterilized aqueous filtrate of the tested compost resulted in significant reduction to the linear growth of the tested fungus compared with control treatment. This reduction was gradually increased by increasing it‫׳‬s concentration. The combination among the bioagents B.subtilis and P.flurescens, compost and soil solarization resulted in significant reduction to strawberry Fusarium wilt with significant increase to the produced fruits and their total soluble solids (T.S.S.) , either each of them was used alone or in their different combinations, compared with control treatment (infested with the causal fungus).On the other hand, compost was the most efficient in this regard compared with the other three items of disease management, i.e. soil solarization and the bioagents B.subtilis and P.flurescens when each of them was used alone. Moreover, no apparent infection was detected when the bioagents B.subtilis and P.flurescens ,compost and soil solarization were used together and produced fruit yield of T.S.S., to somewhat, similar to control treatment ( uninfested soil with the causal fungus).

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Role of Fluorescent Pseudomonads in Plant Growth Promotion and Biological Control of Late Leaf Spot of Groundnut

Cited by 12 publications

References 0 publications

Bacterial Bioagents and Compost as Two Tools for Management of Eggplant Fusarium Wilt

Bacterial Bioagents and Compost as Two Tools for Management of Eggplant Fusarium Wilt

Potentiality of Inducer Resistance Chemicals and Bioagents in Managing Lettuce Downy Mildew

Effect of Combination among Bioagents, Compost and Soil Solarization on Management of Strawberry Fusarium Wilt

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