Association of coumestanss with tee hypersensitivity of Lima bean roots to Pratylenchus scribneri

Influence of nitrogen on accumulation of isosojagol (a newly detected coumestan in soybean) and associated isoflavonoids in roots and nodules of mycorrhizal and non‐mycorrhizal soybean

“…These findings lead us to focus our attention on this newly detected coumestan in soybean, for which no information about biological properties has been reported since it's first identification in Phaseolus coccineus L. (O'Neill et al, 1984). The most studied coumestan is coumestrol: it possesses oestrogenic (Lookhart, 1980), nematostatic (Rich, Keen & Thomason, 1977) and some antibacterial activities (Fett & Osman, 1982). It is also able to promote B. japonicum growth in vitro (D'Arcy-Lameta, 1984) and to induce the expression of nodulation genes in some Rhizobium species (Firmin et al, 1986).…”

Natural Toxicants in Foods

“…An abbreviated list of phytoalexins found in some common food plants is presented in Table 1. Induction of phytoalexin synthesis can result from a plant's exposure to many kinds of stimuli, e.g., bacterial ar viral infection (Lord et al, 1988;Ryan, 1973), exposure to cell wall fragments (Tietjen and Matern, 1984;Ryan, 1988;Ryan et al, 1986), cold, UV light, heavy metal salts (Beier and Oertli, 1983), antibioties, fungicides (Grisebach and Ebel, 1978), herbicides (Kömives and Casida, 1983), at feeding sites of nematodes (Kaplan et al, 1980;Rieh et al, 1977;Veech, 1979), and acidie fog can stimulate the phytoalexin response in celery . A single stimulus like the herbicide acifluorfen can increase the production of phytoalexins and stress metabolites in crops as diverse as bean, celery, cotton, pea, soybean, and spinach (Kömives and Casida, 1983).…”

“…Lima bean pro duces various phytoalexins to external stimulus (Rieh et al, 1977) that are listed with relative concentrations in Table 15 (Harborne, 1986b). Most of these chemieals have measurable fungitoxicities (ü'Neill et al, 1983).…”

Secondary Metabolites with Antinematodal Activity from Higher Plants

“…Immersion of tomato roots in solutions of five phenolics namely pyrocatechol (124), hydroquinone (129), phloroglucinol (130), pyrogallol (131), and orcinol (132) inhibited the infection by R. reniformis [104].…”