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- W1522358664 abstract "The inaccessibility enhanced by a nonpathogen, Erysiphe pisi, in coleoptile cells of barley at the prepenetration stage was related to the time of appressorium maturation. Within 4–5 h after inoculation a unique circular to semicircular structure became visible by light microscopy in one of the lobes of the polymorphic appressorium. Micromanipulation at the SEM level revealed that this structure represented the bottom of the lobe appressed to the host surface. This structure was used as an indicator for maturation of the appressorium. To relate the time of appressorial maturation to induction of inaccessibility, germlings of E. pisi were removed from coleoptile cell surfaces with a micromanipulator and germlings of E. graminis were transferred from another coleoptile to the surface of the same cell. Penetration efficiency (the rate of haustorium formation) of E. graminis was suppressed to about 50% of that of controls when E. pisi had been removed at or 2 h after maturation of its appressorium, while it was not affected when E. pisi had been removed before maturation of its appressorium. These results suggest that E. pisi germlings release signal(s) at the time of maturation of their appressorium which is associated with the enhancement of inaccessibility. A further experiment demonstrated that the inaccessibility enhanced at the time of appressorial maturation persisted in the cells for at least 12 h. Based on these results, it was concluded that recognition of E. pisi by host cells occurred no later than the time of maturation of its appressorium, leading to temporary enhancement of inaccessibility." @default.
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- W1522358664 date "1990-11-01" @default.
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- W1522358664 title "Induced accessibility and enhanced inaccessibility at the cellular level in barley coleoptiles. VII. Enhancement of inaccessibility at the prepenetration stage of a nonpathogen" @default.
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- W1522358664 doi "https://doi.org/10.1016/0885-5765(90)90122-e" @default.
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