Antifungal Activity of Stabilized Ortho Silicic Acid (OSA) against Foliar Plant Pathogens
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ORIGINAL PAPER
Antifungal Activity of Stabilized Ortho Silicic Acid (OSA) against Foliar Plant Pathogens Divya Sharma 1 & Sanyukta Sangwan 1 & Neeru Jain 1 Received: 21 March 2020 / Accepted: 29 July 2020 # Springer Nature B.V. 2020
Abstract Present study was aimed to evaluate antifungal activity of stabilized ortho silicic acid (OSA) against foliar pathogens under in vitro and in vivo conditions. Studies were conducted using a commercial formulation of stabilized ortho silicic acid (2.0%, Silixol™ OSA). Activity of OSA was evaluated on thirteen fungal pathogens (Alternaria alternata, Alternaria macrospora, Alternaria solani, Cercospora arachidicola, Colletotrichum gloeosporioides, Corynespora cassiicola, Curvularia lunata, Bipolaris sorokiniana, Mycosphaerella fragariae, Mycopshaerella musicola, Phoma obscurans, Phyllosticta arachidishypogaeae, and Pyricularia oryzae) using Poison Food Technique. Silixol OSA exhibited a differential activity against all test pathogens. Out of thirteen pathogens, eight exhibited more than 50% inhibition of mycelial growth. Silixol OSA had induced ultrastructure changes in both fungal mycelium and spores. Pathogens with more than 50% inhibition, based on Poison Food Technique, were tested further by in vivo studies. OSA sprayed plants had healthy leaves and exhibited less disease severity. Results of the present study elucidate potential application of stabilized OSA in Integrated Disease Management Program (IDMP) to avoid reliance on synthetic fungicides. Keywords Ortho silicic acid (OSA) . Silixol . Mycelial growth . Artificial inoculation
1 Introduction Silicon (Si) is the second most abundant element after oxygen in the earth’s crust [11, 30]. Importance of silicon for plant growth and development was not recognized initially due to its ubiquitous and abundance availability in nature. Plants belonging to poaceae and cyperaceae family are known as “silicon accumulators” with leaf silicon content exceeding 5% [11]. OSA is the bio available form of silicon, which is generated naturally from soil silicates due to microbial activity and weathering processes. OSA triggers metabolic processes and signalling pathways involved in stress management within plant cells. Absorbed OSA gradually deposits within cell wall to form a “protective layer” [29, 30, 37]. Silicon rich sources have been conventionally used in agriculture for optimizing of crop nutritional status, management of abiotic stress management as well as for the management of diseases caused by fungal pathogens * Neeru Jain [email protected] 1
Privi Life Sciences Pvt.Ltd, Navi Mumbai, India
[12]. Significant reduction in incidence of blue mold decay (63%) brown rot decay (87%) in sweet cherries [36], angular leaf spot (42%) in beans [39], black sigatoka (20%) in banana [21], scab (80%) on leaves and fruits of apple [32] had been reported following application of silicon rich sources. Application of silicon had reduced severity of powdery mildew in wheat (about 80%, [15]) and strawberry (over 70% reduction was recorded
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