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Induced systemic resistance to wheat take-all disease by probiotic bacteria

100%

Jasem A. M., Sharifi R., Abbasi S.

Journal of Plant Protection Research

2018

tom 58

nr 3

In this study, the effect of six commercial biocontrol strains, Bacillus pumilus INR7, B. megaterium P2, B. subtilis GB03, B. subtilis S, B. subtilis AS and B. subtilis BS and four indigenous strains Achromobacter sp. B124, Pseudomonas geniculate B19, Serratia marcescens B29 and B. simplex B21 and two plant defense inducers, methyl salicylate (Me-SA) and methyl jasmonate (Me-JA) were assessed on suppression of wheat take-all disease. Treatments were applied either as soil drench or sprayed on shoots. In the soil drench method, the highest disease suppression was achieved in treatment with strains INR7, GB03, B19 and AS along with two chemical inducers. Bacillus subtilis S, as the worst treatment, suppressed take-all severity up to 56%. Both chemical inducers and bacterial strains AS and P2 exhibited the highest effect on suppression of take-all disease in the shoot spray method. Bacillus subtilis S suppressed the disease severity up to 49% and was again the worst strain. The efficacy of strains GB03 and B19 decreased significantly in the shoot spray method compared to the soil drench application method. Our results showed that most treatments had the same effect on take-all disease when they were applied as soil drench or sprayed on aerial parts. This means that induction of plant defense was the main mechanism in suppressing take-all disease by the given rhizobacteria. It also revealed that plant growth was reduced when it was treated with chemical inducers. In contrast, rhizobacteria not only suppressed the disease, but also increased plant growth.

Pyoverdine production in Pseudomonas fluorescens UTPF5 and its association with suppression of common bean damping off caused by Rhizoctonia solani [Kuhn]

100%

Sharifi R., Ahmadzadeh M., Sharifi-Tehrani A., Talebi-Jahromi K.

Journal of Plant Protection Research

2010

tom 50

nr 1

72-78

Siderophore production is an important mechanism of biological control by a number of strains of plant growth-promoting rhizobacteria. Pseudomonas fluorescens UTPF5 was originally obtained from onion field. Biochemical and physiological characteristics of this strain refer to biovar 3 of P. fluorescens. Strain UTPF5 is an effective bacterium against several phytopathogenic fungi. Pyoverdine type siderophore of this strain was isolated using XAD amberlite column. The plant growth promotion and antifungal properties of bacteria were demonstrated under greenhouse conditions in combination with Fe-EDTA, Fe-EDDHA and Zn as modulators of pyoverdine production. Amendment with zinc, Fe-EDTA and Fe-EDDHA suppressed the disease inhibition when partially used with UTPF5. 7NSK2 and its pyoverdine mutant, MPFM1, were used as reference strains the inhibition percent of which was not affect by soil amendment. Iron chelates, especially Fe-EDDHA, increased growth and chlorophyll production by plants. This effect was improved in the presence of bacterial strains. The siderophore mutant MPFM1 did not exhibit satisfactory disease inhibition and growth promotion activity. In vitro experiments showed that purified pyoverdine could decrease the fungal growth to the same extent as pyoverdine-producing strain.

Ograniczanie wyników

2 Journal of Plant Protection Research

2 Sharifi R.

1 Abbasi S.

1 Ahmadzadeh M.

1 Jasem A. M.

1 Sharifi-Tehrani A.

1 Talebi-Jahromi K.

1 2018

1 2010

Wyniki wyszukiwania

Induced systemic resistance to wheat take-all disease by probiotic bacteria

Pyoverdine production in Pseudomonas fluorescens UTPF5 and its association with suppression of common bean damping off caused by Rhizoctonia solani [Kuhn]