Effects of silicon dioxide nanoparticles (SiO2 NPs) and Rhizobium ciceri was observed alone and in combination on Rhizoctonia
solani/ Fusarium solani / Meloidogyne incognita on the growth, photosynthetic pigments (chlorophyll and carotenoid) and proline
contents of Cicer arietinum.
Inoculation of M. incognita resulted in a greater reduction in plant growth, photosynthetic pigments and higher increase in
proline contents than other test pathogens. Inoculation of R. ciceri or foliar spray of SiO2 NPs (0.10 mg ml-1) with pathogens under
study resulted in increased plant growth, photosynthetic pigments and proline contents than without R. ciceri / NPs. Combined
application of NPs with R. ciceri resulted in a greater increase in plant growth, photosynthetic pigments and proline contents in
plants with pathogens than with NPs or R. ciceri. Plants without R. ciceri had a very poor root nodulation but nodulation was high in
plants with R. ciceri. Pathogens under study and NPs had adverse effect on nodulation caused by R. ciceri. Wet rot and black root rot
indices were 4 when R. ciceri and F. solani were inoculated respectively. R. ciceri / NPs reduced wet root rot, black root rot indices,
galling and population of M. incognita. Disease indices, galling and population of M. incognita were reduced greatly by use of R. ciceri
plus SiO2 NPs.