Effect of SiO2 Nanoparticles on the Interaction of Pseudomonas fluorescens and Meloidogyne incognita in Trachyspermum ammi under Greenhouse Conditions
Mohammad Danish: Section of Plant Pathology and Nematology, Dept of Botany, Aligarh Muslim University,
<div>Root-knot nematodes, <em>Meloidogyne</em> spp. are a major threat to all the agriculture crops. Chemical control is very effective for nematode management, but it leaves several non-specific effects on beneficial organisms along with the pathogen. For alleviation of such problems an eco-friendly method is to be explored that could control nematode population effectively and efficiently. A greenhouse experiment was carried out with the aim to provide an insight into the effects of SiO<sub>2</sub> nanopaticle induced changes in <em>Trachyspermum ammi, </em>an important medicinal plant, inoculated with <em>Meloidogyne incognita</em> and <em>Pseudomonas fluorescens</em>. The results revealed that application of 200 ppm concentration of SiO<sub>2</sub> nanaoparticles in the plants infected with <em>M. incognita</em> and <em>P. fluorescens</em> caused significant increase in both the plant growth as well as physiological parameters, in comparison to nematode inoculated plant and the values were found to be at par with the control plants. Higher concentrations, however, produced inhibitory effects in a concentration dependent manner. The plant inoculated with <em>M. incognita</em> and <em>P. fluorescens</em>, and treated with low concentration of SiO<sub>2</sub> nanoparticles exhibited increase in colonization of <em>P. fluorescens</em> in the rhizospheric environment and reduction in nematode infestation and gall number. Hence, it was concluded that low concentration of SiO<sub>2</sub> nanoparticles along with <em>P. fluorescens</em> could be used as an effective measure for managing the disease caused by <em>M. incognita</em>.</div>
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