Abstract
The use of agrochemical products to combat diseases in crops has adverse effects on the environment and human health. Plant growth promoting rhizobacterium (PGPR) has been increasingly proposed as an eco-friendly alternative in agriculture. PGPRs have beneficial effects not only in promoting plant growth but also have shown their potential as biological control agent, being able to inhibit plant pathogens. Here, we investigated the use of PGPR Paraburkholderia sp. strain SOS3 to provide disease protection in rice (Oryza sativa L.). The antagonistic activity of SOS3 against five fungal pathogens of rice was assessed by dual culture on plates and on rice seedlings. The results showed that on plate assay, SOS3 inhibits the growth of Curvularia lunata, Rhizoctonia solani, Pyricularia oryzae, Helminthosporium oryzae, and Fusarium moniliforme by 17.2%, 1.1%, 8.3%, 32.5%, and 35.4%, respectively. When inoculated on rice seeds, SOS3 promotes seed germination and significantly reduces disease symptoms in plants infected with R. solani. These results suggest that SOS3 has a great potential to be used in rice agriculture to combat the “Sheath Blight” disease.
Highlights
Protection of crop plants from pathogens and improvement of plant productivity is critical in the context of increasing demand for food to support the growing world population
The results showed that on plate assay, SOS3 inhibits the growth of Curvularia lunata, Rhizoctonia solani, Pyricularia oryzae, Helminthosporium oryzae, and Fusarium moniliforme by 17.2%, 1.1%, 8.3%, 32.5%, and 35.4%, respectively
Five fungal pathogens were tested, Curvularia lunata, Rhizoctonia solani, Pyricularia oryzae, Helminthosporium oryzae, and Fusarium moniliforme, all being responsible for plant diseases in various crop plants in the world, such as sheath blight, blast, rot, and bakanae diseases [2] [3] [10] (Table 1)
Summary
Protection of crop plants from pathogens and improvement of plant productivity is critical in the context of increasing demand for food to support the growing world population. Rice plants are attacked by various phytopathogens inducing diseases such as stem rot, blast, sheath blight, and bakanae, which result in low yield and quality of the crop [2] [3]. The use of synthetic chemicals has recently raised concerns due to their negative effects on the environment and human health, alternative and more sustainable strategies are required. Biological control is an environmentally friendly strategy for dealing with plant pathogens that shows potential for replacing or reducing the use of synthetic chemical compounds
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