Impact of silicon dioxide nanoparticles on growth, photosynthetic pigments, proline, activities of defense enzymes and some bacterial and fungal pathogens of tomato


Research Articles | Published:

Print ISSN : 0970-4078.
Online ISSN : 2229-4473.
Pub Email:
Doi: 10.1007/s42535-021-00280-4
First Page: 83
Last Page: 93
Views: 1121

Keywords: Disease index, Disease management, Scanning electron microscopy, SiO2 NPs, Solanum lycopersicum


The effects of silicon dioxide nanoparticles (SiO2 NPs) in two concentrations (0.10 and 0.20 gL− 1) as foliar spray and seed priming was observed on plant growth attributes, chlorophyll, carotenoid, proline, activities of defense enzymes of tomato and on bacterial pathogens i.e. Pseudomonas syringae pv. tomato (Pst), Xanthomonas campestris pv. vesicatoria (Xcv), Pectobacterium carotovorum subsp. carotovorum (Pcc) and Ralstonia solanacearum (Rs), and fungal pathogens i.e. Fusarium oxysporum f. sp. lycopersici (Fol) and Alternaria solani (As) under in vitro and greenhouse conditions. Disease suppression and increase in plant growth was dependent on concentration of NPs and mode of application. Foliar spray was more effective than seed priming in increasing plant growth, chlorophyll, carotenoid, proline and activities of defense enzymes i.e. superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and phenylalanine ammonia lyase (PAL) in the presence and absence of pathogens. Foliar spray of 0.20 gL− 1SiO2 NPs caused highest increase in plant growth parameters, chlorophyll, carotenoid, proline and activities of defense enzymes in tomato plants and caused maximum reduction in disease indices. In vitro tests and scanning electron microscopy revealed antimicrobial effects of SiO2 NPs with varied adverse effects on pathogens under study. Plants subjected to foliar spray with 0.20 gL− 1SiO2 NPs had more plant growth attributes, chlorophyll, carotenoid, proline and defense enzymes against pathogens under study.

Disease index, Disease management, Scanning electron microscopy, SiO2 NPs, 

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First author is thankful to Aligarh Muslim University, Aligarh, UP, India and University Grants Commission, New Delhi, India for the award of University Fellowship to carry out this work.

Author Information

Parveen Aiman
Section of Plant Pathology and Nematology, Department of Botany, Aligarh Muslim University, Aligarh, India
Siddiqui Zaki Anwar
Section of Plant Pathology and Nematology, Department of Botany, Aligarh Muslim University, Aligarh, India