Abstract
A physical shock such as UV irradiation when applied to barley coleoptiles prior to inoculation has been reported to allow the nonpathogen, Erysiphe pisi, to produce haustoria. Similarly, UV irradiation increases penetration efficiency of the pathogen, E. graminis. However, in spite of the fact that penetration efficiency of E. graminis is increased by UV irradiation of coleoptiles, the emergence of secondary hyphae after haustorium formation is inhibited after UV irradiation. This inhibition was reversed by treating barley coleoptiles with glucose or sucrose, and secondary hypha Formation was restored. The treatment of UV irradiated barley coleoptiles with these sugars decreased the penetration efficiency of the nonpathogen, E. pisi. Thus, certain sugars can reverse UV-induced accessibility of coleoptiles to the nonpathogen and restore inaccessibility to the host tissue. One of the reasons for induced cellular accessibility by UV irradiation may be the blocking of energy supplies necessary for expression of resistance.
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