Biological control of three phytopathogenic fungi by Pseudomonas fluorescens isolated from rhizosphere.

10.5580/c13 ◽  
2009 ◽  
Vol 7 (2) ◽  
Keyword(s):  
Biological Control ◽  
Pseudomonas Fluorescens ◽  
Phytopathogenic Fungi

scholarly journals In vitro and in vivo Assay for Assessment of the Biological Control Potential of Streptomyces sp. KT

2017 ◽  
Vol 7 (1) ◽  
pp. 10
Author(s):  
Tatsuya Ohike ◽  
Minori Maeda ◽  
Tetsuya Matsukawa ◽  
Masahiro Okanami ◽  
Shin’ichiro Kajiyama ◽  
...  
Keyword(s):  
Biological Control ◽  
Suppressive Effect ◽  
Phytopathogenic Fungi ◽  
Dual Culture ◽  
Biological Control Agents ◽  
Bipolaris Oryzae ◽  
Biological Control Potential ◽  
Dual Culture Assay

Rhizoctonia solani is fungal plant pathogen that infects many different host plants. Recently, biological control agents that are friendly to the environment and ecosystems have attracted much attention as an alternative to the use of chemical fungicide which have been used worldwide to control soil borne pathogens including R. solani. In this study, 53 strains of actinomycetes isolated from environmental soils, and antifungal activities of them were assessed by the dual culture assay. Strain KT showed strong inhibitory activities against 8 phytopathogenic fungi. A great suppressive effect on R. solani growth was observed in the inoculation test of plants using cucumber and chin-geng-sai. In addition, infection of Bipolaris oryzae also could be suppressed in the detached leaf assay using oats. As a result of genetic analysis, it was shown that KT was a species closely related to Streptomyces lavenduligriseus NRRL B-3173T. However, as far as we know, there is no report for biological control agents using S. lavenduligriseus. This study suggests that the strain KT may useful as biological control agents to suppress various crop diseases.

Achieving biological control of phytopathogenic fungi using ß-methoxyacrylates

1994 ◽  
Vol 22 (1) ◽  
pp. 66S-66S ◽  
Author(s):  
IAN C. RICHARDS ◽  
RICHARD J. MILLING ◽  
JANICE E. PITTIS
Keyword(s):  
Biological Control ◽  
Phytopathogenic Fungi

scholarly journals Prospects for using Ganoderma lucidum (Curtis) P. Karst. for biological control of phytopathogenic fungi

2021 ◽  
Vol 848 (1) ◽  
pp. 012162
Author(s):  
I N Pavlov ◽  
Y A Litovka ◽  
P V Makolova ◽  
A A Timofeev ◽  
E A Litvinova ◽  
...  
Keyword(s):  
Biological Control ◽  
Ganoderma Lucidum ◽  
Phytopathogenic Fungi

scholarly journals Biological Control Activity of Two Isolates of Pseudomonas fluorescens against Rice Sheath Blight

2006 ◽  
Vol 22 (3) ◽  
pp. 289-294 ◽  
Author(s):  
Gyung-Ja Choi ◽  
Jin-Cheol Kim ◽  
Eun-Jin Park ◽  
Yong-Ho Choi ◽  
Kyoung-Soo Jang ◽  
...  
Keyword(s):  
Biological Control ◽  
Pseudomonas Fluorescens ◽  
Sheath Blight ◽  
Rice Sheath Blight ◽  
Control Activity

Secondary Metabolite- and Endochitinase-Dependent Antagonism toward Plant-Pathogenic Microfungi of Pseudomonas fluorescens Isolates from Sugar Beet Rhizosphere

1998 ◽  
Vol 64 (10) ◽  
pp. 3563-3569 ◽  
Author(s):  
Mette Neiendam Nielsen ◽  
Jan Sørensen ◽  
Johannes Fels ◽  
Hans Christian Pedersen
Keyword(s):  
Biological Control ◽  
Cell Wall ◽  
Sugar Beet ◽  
Pseudomonas Fluorescens ◽  
Secondary Metabolite ◽  
Pythium Ultimum ◽  
Medium Composition ◽  
Fungal Antagonism ◽  
Lipopeptide Antibiotic

ABSTRACT Forty-seven isolates representing all biovars of Pseudomonas fluorescens (biovars I to VI) were collected from the rhizosphere of field-grown sugar beet plants to select candidate strains for biological control of preemergence damping-off disease. The isolates were tested for in vitro antagonism toward the plant-pathogenic microfungi Pythium ultimum and Rhizoctonia solani in three different plate test media. Mechanisms of fungal inhibition were elucidated by tracing secondary-metabolite production and cell wall-degrading enzyme activity in the same media. Most biovars expressed a specific mechanism of antagonism, as represented by a unique antibiotic or enzyme production in the media. A lipopeptide antibiotic, viscosinamide, was produced independently of medium composition by P. fluorescens bv. I, whereas the antibiotic 2,4-diacetylphloroglucinol was observed only in glucose-rich medium and only in P. fluorescens bv. II/IV. Both pathogens were inhibited by the two antibiotics. Finally, in low-glucose medium, a cell wall-degrading endochitinase activity in P. fluorescens bv. I, III, and VI was the apparent mechanism of antagonism toward R. solani. The viscosinamide-producing DR54 isolate (bv. I) was shown to be an effective candidate for biological control, as tested in a pot experiment with sugar beet seedlings infested with Pythium ultimum. The assignment of different patterns of fungal antagonism to the biovars of P. fluorescens is discussed in relation to an improved selection protocol for candidate strains to be used in biological control.

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