Biocontrol of downy mildew disease of pearl millet using Pseudomonas fluorescens

Umesha, S.; Dharmesh, Shylaja M.; Shetty, Sudheer A.; Krishnappa, M. R.; Shetty, H. S.

doi:10.1016/s0261-2194(98)00014-3

Cited by 54 publications

(25 citation statements)

References 16 publications

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“…Yet another important result was the significant increase in 1000 seed weight and consequent increase in yield, particularly the isolates UOM SAR 14 and UOM SAR 80 which recorded 22 and 16% more yield in comparison with the control. Our results are in line with previous studies where seed treatment with Pseudomonas fluorescens has resulted in enhanced yield in cereals such as pearl millet, wheat, and rice (Umesha et al, 1998, Luz, 2001, Nandakumar et al, 2001. Though the mechanism was not studied, enhanced plant productivity can be attributed to suppression of deleterious microorganisms and pathogens, production of plant growth regulators such as gibberellins, cytokinins and indole acetic acid, increased availability of minerals and other ions, extensive rooting which facilitates water and nutrient uptake (van Loon et al, 1998, Ramamoorthy et al, 2001.…”

Section: Discussionsupporting

confidence: 91%

“…The isolate UOM SAR 14 recorded the greatest increase in growth parameters like height, leaf area, tillering capacity and reproductive parameters such as number, length and girth of earhead and 1000 seed weight. Similar results were reported for other crops where seed treatments with Pseudomonas fluorescens have increased growth of host plants (Suslow and Schroth, 1982, Schippers et al, 1987, Wei et al, 1996, Umesha et al, 1998, Lazarovitz and Nowak, 1997, Barka et al, 2000, Niranjan et al, 2003a.…”

Section: Discussionsupporting

confidence: 80%

“…Effectiveness of bio-priming with Pseudomonas fluorescens in improvement of growth was evident from the initial stages itself wherein seed germination, seedling vigour, seedling emergence and seedling stand were improved over the control. Similar improvement of seed quality by rhizobacteria has been reported earlier in pearl millet (Umesha et al, 1998, Niranjan et al, 2003a and also in other cereals such as sorghum and rice (Raju et al, 1999, Praveen Kumar et al, 2000.…”

Section: Discussionsupporting

confidence: 79%

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Seed bio-priming withPseudomonas fluorescensisolates enhances growth of pearl millet plants and induces resistance against downy mildew

Raj¹,

Shetty²,

Shetty³

2004

International Journal of Pest Management

124

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Abstract. Biopriming pearl millet seeds with Pseudomonas fluorescens isolates resulted in improved growth of the plants and also induction of resistance against downy mildew disease caused by the fungus Sclerospora graminicola. Although all of the test isolates reduced disease severity and promoted growth both under greenhouse and field conditions, high variability was observed in their efficiency. Treatment due to Pseudomonas fluorescens resulted in enhancement of: germination, seedling vigour, plant height, leaf area, tillering capacity, seed weight (measured for 1000 seeds) and yield. The time required for flowering was advanced by 5 days. Isolate UOM SAR 14 registered higher levels of vegetative and reproductive growth; most importantly there was a 22% increase in grain yield. The isolates also effectively induced resistances against downy mildew disease both under greenhouse and field conditions. The isolates offered protection ranging from 20 to 75%. However, the level of disease control was less than that achieved by the systemic fungicide Apron. UOM SAR 14 offered 71 and 75% and remained consistent under all test conditions. Further studies showed that the resistance induced was systemic, required a minimum of 3 days to build up, and was sustained throughout the plant's life.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 80%

Section: Discussionsupporting

confidence: 79%

See 1 more Smart Citation

Seed bio-priming withPseudomonas fluorescensisolates enhances growth of pearl millet plants and induces resistance against downy mildew

Raj¹,

Shetty²,

Shetty³

2004

International Journal of Pest Management

124

View full text Add to dashboard Cite

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“…The fresh culture and formulations (Talc and Sodium alginate) of P.fluorescens isolate 2, significantly increased seed germination and seedling vigor over the control. Such plant growth promotion activities of P.fluorescens was reported in crops such as, rice, wheat, sorghum pearl millet, tomato, brinjal, chilli, redgram, cucumber and sunflower [25,37,38,39,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The fresh cultures of the biocontrol agent were found to be best in reducing fusarium wilt under green house conditions.…”

Section: Resultsmentioning

confidence: 94%

BIOLOGICAL CONTROL OF F. OXYSPORUM f. sp. LYCOPERSICI CAUSING WILT OF TOMATO BY PSEUDOMONAS FLUORESCENS

BB¹,

S²,

AC³

et al. 2011

Int J of Micr Res

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Abstract-Pseudomonas fluorescens is one of the major fungal biocontrol agents found in the soil and the rhizosphere of various crop systems. Ten isolates of P.fluorescens were isolated from rhizosphere soil samples collected from various tomato-growing fields and evaluated for their efficacy in increasing seed quality variables of tomato and in inhibiting the mycelial growth of Fusarium oxysporum. Pseudomonas isolate 2 produced effective results and was selected and mass multiplied. Talc and sodium alginate formulations of mass multiplied using different agents were prepared and evaluated for their effects against fusarium wilt under greenhouse conditions. Fresh cultures of Pf2 isolate was found to increase seedling emergence and reduce fusarium wilt disease incidence when compared to the control and the formulations.

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“…Pseudomonas fluorescens is one of the most important antagonists of certain fungi and bacteria, and numerous greeenhouse studies have been conducted to show its efficacy in the control of several plant diseases (Parke et al, 1991;Kraus and Loper, 1992;Umesha et al, 1998). Results of a novel study of Umesha (2006) showed that biological seed treatment with the antagonistic P. fluorescens strain drastically reduced bacterial canker incidence in the field.…”

Section: Introductionmentioning

confidence: 99%

Effects of copper-based compounds, antibiotics and a plant activator on population sizes and spread of Clavibacter michiganensis subsp. michiganensis in greenhouse tomato seedlings

et al. 2009

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SUMMARYThree copper-based compounds (copper hydroxide, copper oxychloride, copper sulphate), two antibiotics (streptomycin and kasugamycin) and a plant activator (ASM) significantly reduced population sizes and spread of C. michiganensis subsp. michiganensis among tomato seedlings in the greenhouse. Streptomycin had the best effect in reducing pathogen population size in all sampling regions. Moreover, this antibiotic completely stopped the spread of C. michiganensis subsp. michiganensis in the region most distant from the inoculum focus. Copper hydroxide mixed with streptomycin significantly limited the pathogen population, compared with copper hydroxide alone, the other copper-based compounds, ASM and kasugamycin. However, combining streptomycin with copper hydroxide did not contribute to its greater efficacy against the pathogen population. Copper-based compounds, in general, were less effective in limiting pathogen population sizes than the other treatments in all three sampling regions, primarily copper oxychloride and the combination of copper hydroxide and mancozeb. Among copper compounds, copper hydroxide was the most prominent in reducing the bacterial population, especially in the region closest to the inoculum focus, while its combination with mancozeb did not improve the effects. Kasugamycin significantly limited pathogen population size, compared to copper bactericides, but it was less effective than the other antibiotic compound, i.e. streptomycin. The plant activator ASM significantly reduced population density, and it was more effective when used three days prior to inoculation than six days before inoculation.

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Biocontrol of downy mildew disease of pearl millet using Pseudomonas fluorescens

Cited by 54 publications

References 16 publications

Seed bio-priming withPseudomonas fluorescensisolates enhances growth of pearl millet plants and induces resistance against downy mildew

Seed bio-priming withPseudomonas fluorescensisolates enhances growth of pearl millet plants and induces resistance against downy mildew

BIOLOGICAL CONTROL OF F. OXYSPORUM f. sp. LYCOPERSICI CAUSING WILT OF TOMATO BY PSEUDOMONAS FLUORESCENS

Effects of copper-based compounds, antibiotics and a plant activator on population sizes and spread of Clavibacter michiganensis subsp. michiganensis in greenhouse tomato seedlings

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