Raceの異なるいもち病菌に対するイネ品種の細胞反応の差異

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This paper deals with the host-parasite interaction in the rice blast disease, using the following four combinations of two races and two rice varieties: isolate P2(race N)× Reishiko・・・・・・resistant isolate 53-33(race C)× Reishiko・・・susceptible 〃〃 ×Aichiasahi・・・・・・susceptible 〃〃 ×Aichiasahi・・・susceptible Inner surface of detached leaf-sheath was inoculated with dilute spore suspension and the reaction of invaded cells was examined under microscope, after 12 to 44 hour-incubation at 26℃. The infected tissue was soaked in O.8M KNO_3 solution prior to the examination in order to test for the plasmolytic activity of the invaded and the neighbouring cells. 1. Hyphae of P2 penetrate the cell wall of both varieties within 12 hours after inoculation. All the invaded cells are alive until this time (Plate I). After 18 hours, however, most of the primarily invaded cells of the resistant variety (Reishiko) appear to have died, whereas, most of those of the susceptible variety (Aichiasahi) remain alive. A similar tendency was traced during the later period, from 24 to 44 hours after inoculation (Plate I). In the resistant variety, the hyphae enclosed in most of the invaded cells die within 24 hours after inoculation, whereas, in the susceptible variety, they remain alive in most of the invaded cells for much longer period (PlateII). Cells adjoining the primarily invaded cell appear to have died more abundantly in the resistant variety than in the susceptible variety within 24 hours after inoculation, but the number of dead cells around the invaded cell tend to increase rapidly in the susceptible variety during the later period until about 44 hours. 2. When the variety Reishiko is inoculated with the isolate 53-33, which is highly virulent to both varieties, the death of primarily invaded cells is markedly delayed. This result is quite similar to that with Aichiasahi inoculated with P2. Simllarities are also observed between Reishiko-53-33 and Aichiasahi-P2 combinations in color reactions of the invaded tissues to triphenyltetrazolium chloride, nadi-reagent, and ph10roglucine-HCl. 3. From these results it is concluded that, although Piricularia oryzae is not an obligate, there must be a symbiotic phase in the early stage of infection, in case the host is susceptible, or that the hypersensitive reaction of the host is a main cause of resistance.
日本植物病理学会の論文
1963-01-30

Raceの異なるいもち病菌に対するイネ品種の細胞反応の差異

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