Rhynchosporoside, a host-selective toxin produced by Rhynchosporium secalis , the causal agent of scald disease of barley

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Abstract
Rhynchosporoside, a phytotoxic compound, was isolated from cultures of R. secalis, the causal agent of scald disease of barley. The toxin is a cellobioside of 1,2-propanediol. The compound may play some role in symptom expression because it was isolated from diseased plants in concentrations similar to those that could cause symptoms in toxin-treated plants. The toxin causes leaf tip and marginal necrosis and subsequent chlorosis of the entire leaf. The toxin affects only certain cultivars and lines of barley and rye; however, it also affects certain nonhosts of R. secalis. The genetic factor controlling host resistance to the fungus is not identical to that controlling insensitivity to the toxin.