Histopathology of Colletotrichum gloeosporioides on the susceptible and resistant local-varieties of Chinese matrimony vine.
1988
Park S.K. | Kim K.C.
Histopathological changes were investigated on the infection sites of fruits of Chinese matrimony vine (Lycium chinense Mill.) caused by Colletotrichum gloeosporioides. The epidermal cells of the resistant local-variety, Jindo I, were shorter in length and the outer epidermal cell walls of Jindo I were thicker than those of the susceptible local-variety, Chungyang I. Dentage projections on the epidermal cell wall of Jindo I were more densely distributed than those of Chungyang I. No differences, however, were found between Jindo I and Chungyang I in the conidial germination and appressorial formation on the surface of fruits. The infection hyphae penetrated Jindo I only through intercellular junctions of epidermal cells but in Chungyang I both way through intercellular junctions and across epidermal cell wall. Within 96 hours after inoculation, in Jindo I only one epidermal cell to which the infection hyphae penetrated, became necrotic, while in Chungyang I a number of necrotic and destroyed cells were seen around the penetration site as well as proliferation of mycelia. In both local-varieties, necrotic cells were accompanied with cell divisions. These results suggest that resistance of the fruit of Chinese matrimony vine to C. gloeosporioides are partially due to the thickness of epidermal cell wall and the necrosis-inducing principles of the cell.
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