Index >> Rhizosphere and Phyllosphere >> Some of the Knowm Phytoalexins their Incitants and Specific Hosts

Plant

Incitants

Compounds produced (Phytoalexins)

Potato (Solanum
tuberosum)

Phytophthora infestans

Chlorogenic acid, Caffeic acid,
Scopolin, a-Solanine, a-Chaconine, Solanidine, Rishitin and Phytuberin

Pea (Pisum sativum)

Aschochyta pisi, Penicillium expansum

Pisatin

Green bean (Phaseolus vulgaris)

Monillia fruticola, Rhizoctonia solani, Colletotrichum lindemuthianum

Phaseolin

Carrot (Daucus carota)

Ceratocystis spp.

Chlorogenic acid and 6-Methoxy­mellein (MM)

Soybean (Glycine max)

Phytophthora sojae and other fungi

Hydroxyphaseolin

Sweet potato

Infection, injury and treatment to chemicals

Chlorogenic acid, Caffeic acid, Scopoletin, Esculenitin, Umbelliferone and Ipomeamarone

Cotton (Gossypium spp.)

Verticillium albo-atrum

Gossypol

Broad bean (Vicia
faba)

Botrytis spp.

Wyerone

Alfalfa (Medicago sativa)

Helmintlwsporium turcicum, Colletotrichum phomoides, Ascochyta imperfecta, Cylindrocladium scoparium, Colletotrichum trifolii, Uromyces striatus

As examples-Sativol, Medicagol, Coumesterol and other glycosides

Red clover (Trifolium subterraneum)

Sclerotinia trifoliorum

Formononetin, Biochanin A, Trifolirhizin, Medicarpin

Apple

Venturia inaequalis

Phloridzin and Phloretin oxidation products

Tobacco

Psudomonas solanacearum, Nectria galligena

Scopoletin, Scopolin Benzoic acid