Brassica species are sources of bioactive compounds with several biological properties including biocidal activity against various soil borne pathogens and pests such as parasitic nematodes. Isothiocyanates derived from corresponding glucosinolates are major bioactive compounds responsible for this activity. In this study, glucosinolate content of red and white radish (Raphanus sativus L.), oilseed rape (Brassica napus L.), turnip (Brassica rapa L.) and Arugula (Eruca sativa L.) that were previously assessed for their host suitability level of root-knot nematodes (Meloidogyne arenaria and Meloidogyne incognita) were determined to understand the relationship between glucosinolate content and host-suitability level of these crops. The highest glucosinolate content was in radish. Turnip revealed lower levels compared to radish. However, the lowest glucosinolate content was determined in arugula and oilseed rape. Together with previous findings demonstrating host-suitability levels, the effect of glucosinolates on biocidal potential of Brassicaceae plants to fight against root-knot nematodes were evaluated.Copy Right, IJAR, 2017,. All rights reserved.
…………………………………………………………………………………………………….... Introduction:-The incorporation of plants containing specific biologically active compounds into soil against soil-borne pests is a natural plant protection approach. The Brassicaceae plants synthesize glucosinolates (GSL) that are sources of bioactive compounds such as isothiocyanates with several biological properties including biocidal activity. They are classified as aliphatics, aromatics or indoles having different properties and functions. Genetic factors determine the glucosinolate profile of plants, therefore the glucosinolates produced by a plant may vary. Glucosinolate content, however, is under the influence of environmental factors as well as stress factors during the growth period as reviewed by Sarıkamış 2009. Although present in the entire plant, the amount of glucosinolates is variable at different plant parts and plant growth stages (Brown et al., 2003).Glucosinolates are hydrolyzed by endogenous myrosinases to produce an array of compounds including isothiocyanates, nitriles and indoles. Among these compounds isothiocyanates are associated with several biological activities including the suppression of soil borne pests (Lin et al., 2000). Benzyl isothiocyanate derived from the Corresponding Author:-G. Sarıkamıs. Address:-Ankara University, Faculty of Agriculture, Department of Horticulture, Ankara, Turkey.
ISSN: 2320-5407Int. J. Adv. Res. 5(10), 271-278 272 hydrolysis of glucotropaeolin and 2-phenylethyl isothiocyanate has been shown to have high levels of antibacterial activity (Jang et al., 2010) and toxicity to several soil pathogens including nematodes and fungi (Jensen et al., 2010). Root-knot nematodes are plant parasitic nematodes that cause high losses in plants by reducing its quality and quantity. Chemical nematicides including soil fumigants have effectively controlled nematodes (Nyczepir and Thoma...