In Vitro Inhibition of <i>Rhizoctonia oryzae</i>-<i>sativae</i> Using Bacterial Strains as a Sustainable Alternative for Controlling Sheath Blight in Rice

In Vitro Inhibition of <i>Rhizoctonia oryzae</i>-<i>sativae</i> Using Bacterial Strains as a Sustainable Alternative for Controlling Sheath Blight in Rice

The control of ‘sheath blight’ in rice (<i>Oryza sativa</i> L.), which is caused by the fungus <i>Rhizoctonia oryzae</i>-<i>sativae</i>, has become problematic due to the excessive application of fungicides and their consequent harmful effects. Hence, the search f...

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Main Authors: Liz Cheril Quiñones-Pezo, Winston Franz Ríos-Ruiz, Danny Fran Pompa-Vásquez, Franz Rios-Reategui, Angel David Hernández-Amasifuen, Mike Anderson Corazón-Guivin
Format: Article
Language:English
Published: MDPI AG 2024-10-01
Series:International Journal of Plant Biology
Subjects:
biological control
biocides
antibiosis
soluble secondary metabolites
Online Access:https://www.mdpi.com/2037-0164/15/4/70
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Summary:The control of ‘sheath blight’ in rice (<i>Oryza sativa</i> L.), which is caused by the fungus <i>Rhizoctonia oryzae</i>-<i>sativae</i>, has become problematic due to the excessive application of fungicides and their consequent harmful effects. Hence, the search for less contaminating alternatives to conventional chemical products is necessary. This study evaluated the in vitro inhibitory activity of four bacterial strains on the growth of <i>R. oryzae-sativae</i> in both tryptone soy broth (TSB) and mineral medium (MM). The results demonstrated that all evaluated strains (<i>Bacillus tequilensis</i> SMNCT17-02, <i>Priestia aryabhattai</i> SMNCH17-07, <i>Burkholderia vietnamiensis</i> TUR04-01, and <i>Burkholderia vietnamiensis</i> TUR04-03) inhibited the growth of <i>R. oryzae-sativae</i>. Specifically, the activity of <i>B. tequilensis</i> SMNCT17-02 resulted in the smallest area of <i>R. oryzae-sativae</i> growth in both TSB medium (8.54 cm<sup>2</sup>) and MM (5.53 cm<sup>2</sup>), suggesting a notable antifungal effect. When evaluating the action of supernatants generated by the growth of the four bacterial strains in TSB and MM culture media, significant inhibition of <i>R. oryzae-sativae</i> growth was only observed for supernatants produced in MM. This inhibition was attributed to the presence of soluble secondary metabolites. These results offer new perspectives in biotechnology, suggesting the possibility of developing effective products based on easily extractable soluble secondary metabolites, thus promoting sustainable agriculture.
ISSN:2037-0164

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