Host-Pathogen Interactions

Publisher Website
Google Scholar
Abstract
A .beta.-glucan isolated from the mycelial walls of Phytophthora megasperma var. sojae and a glucan purified from yeast extract stimulate the accumulation of phytoalexins in red kidney bean, Phaseolus vulgaris, and stimulate the accumulation of the phytoalexin, rishitin, in potato tubers, Solanum tuberosum. These glucans are potent elicitors of glyceollin accumulation in soybean, Glycine max. Treatment of kidney bean cotyledons with the glucan elicitors resulted in the accumulation of at least 5 fungistatic compounds. These compounds migrate during TLC identically to the fungistatic compounds which accumulate in kidney beans which kidney beans. Potatoes accumulate as much as 29 .mu.g of rishitin/g fresh wt following exposure to the glucan from P. megasperma var. sojae and as much as 19.5 .mu.g of rishitin/g fresh wt following exposure to yeast glucan. Potatoes accumulated 28 .mu.g of rishitin/g fresh wt following inoculation with live P. megasperma var. sojae.