EFFECT OF BACTERIAL BIOCONTROL AGENTS ON COMMON BEAN BLIGHT CAUSED BY XANTHOMONAS AXONOPODIS PV. PHASEOLI

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DRIKVAND FATEMEH; BAZGIR EYIDI; DARVISHNIA MOSTAFA

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Journal: JOURNAL OF AGROECOLOGY (کشاورزی بوم شناختی) Year:2017 | Volume:7 | Issue:1 Page(s): 124-138

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Title

EFFECT OF BACTERIAL BIOCONTROL AGENTS ON COMMON BEAN BLIGHT CAUSED BY XANTHOMONAS AXONOPODIS PV. PHASEOLI

Author(s)

DRIKVAND FATEMEH | BAZGIR EYIDI | DARVISHNIA MOSTAFA | Issue Writer Certificate

Keywords

BEANQ3

BIOLOGICAL CONTROLQ2

BACILLUS SPP.Q2

PSEUDOMONA SPP.Q3

XANTHOMONAS SPPQ2

Abstract

Introduction: Common bacterial BEAN blight with the casual agent of Xanthomonas axonopodis pv. phaseoli (Xap) causes severe damage to the crop in the west of the country. The disease is prevalent in areas with warm weather, causing up to 80% yield reduction (Lak and Dorri, 2009). One of the ways to control the plant disease is to use bacterial biological agents such as Pseudomonas fluorescens and Bacillus subtillis. The aim of this study is to investigate the biological agents that control common bacterial BEAN blight disease.Materials and methods: First, the growth inhibitory effect of bacterial biocontrol agents against Xap was investigated in vitro on the Nutrient Agar (NA) medium for 24 hours. Then the effect of biological agents (P. fluorescens, B. subtilis, and the combination of them) against Xanthomonas axonopodis pv. phaseoli were evaluated in a completely randomized design in addition to four replications under greenhouse conditions. After about three weeks, indices such as fresh root and shoot weight, dry root and shoot weight, root and stem height, plant resistance, and the percentage of plant disease (according to the coding system ICTA and the method of Webster et al., 1983) were measured and used to analyse the control power of the biological agents.Results and Discussion: The results showed the biological agents prevented the growth of Xanthomonas axonopodis pv. phaseoli by creating a zone inhibitor in the NA medium. The diameter of zone inhibition for P. fluorescens and B. subtilis were respectively 32.75 and 20.75 mm. Zone inhibition indicated that the biological agents P. fluorescens and B. subtilis reduced by 20% and 30% Xanthomonas axonopodis pv. Phaseoli’s growth in the culture medium. The severity of Xanthomonas axonopodis pv. phaseoli symptoms on BEAN plants under greenhouse conditions were more than 63%, but the biological treatments reduced the symptoms and increased the plant’s strength. In this study, the combination of these two biological factors’ treatment )P. fluorescens + B. subtillis) had the greatest biocontrol effects on the disease and reduced BEAN common bacterial blight symptoms up to 51% compared to the control. They converted the plant from susceptible to moderately resistant. Singular treatments of P. fluorescens and B. subtilis reduced symptoms up to 21.74% and 15.22% respectively. These changes in the weight and height of the plants infected by the biological agents Xanthomonas axonopodis pv. phaseoli had a significant effect on the one-percent significance level. It has been found that these biological agents can prevent the growth of plant pathogenic bacteria such as Xanthomonas axonopodis pv. phaseoli by the production of antibiotics, secondary metabolite (Raijmakers and Mazzola, 2012), direct impact on plant growth, production of auxin and cytokinin, and stimulation of plant resistance (Nejad et al., 2000; Kilian et al., 2000). Conclusion: These biological agents, such as P. fluorescens and B. subtilis, had a significant impact in preventing the growth of Xanthomonas axonopodis pv. phaseoli. Thus, we could use these biological agents and their materials production to control common BEAN blight disease.

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APA: Copy

DRIKVAND, FATEMEH, BAZGIR, EYIDI, & DARVISHNIA, MOSTAFA. (2017). EFFECT OF BACTERIAL BIOCONTROL AGENTS ON COMMON BEAN BLIGHT CAUSED BY XANTHOMONAS AXONOPODIS PV. PHASEOLI. JOURNAL OF AGROECOLOGY (کشاورزی بوم شناختی), 7(1 ), 124-138. SID. https://sid.ir/paper/254785/en

Vancouver: Copy

DRIKVAND FATEMEH, BAZGIR EYIDI, DARVISHNIA MOSTAFA. EFFECT OF BACTERIAL BIOCONTROL AGENTS ON COMMON BEAN BLIGHT CAUSED BY XANTHOMONAS AXONOPODIS PV. PHASEOLI. JOURNAL OF AGROECOLOGY (کشاورزی بوم شناختی)[Internet]. 2017;7(1 ):124-138. Available from: https://sid.ir/paper/254785/en

IEEE: Copy

FATEMEH DRIKVAND, EYIDI BAZGIR, and MOSTAFA DARVISHNIA, “EFFECT OF BACTERIAL BIOCONTROL AGENTS ON COMMON BEAN BLIGHT CAUSED BY XANTHOMONAS AXONOPODIS PV. PHASEOLI,” JOURNAL OF AGROECOLOGY (کشاورزی بوم شناختی), vol. 7, no. 1 , pp. 124–138, 2017, [Online]. Available: https://sid.ir/paper/254785/en

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