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Sporulation potentials of rice blast lesions on rice cultivars differing in field resistance to blast



Sporulation potentials of rice blast lesions on rice cultivars differing in field resistance to blast



Annals of the Phytopathological Society of Japan 45(5): 695-698



Sporulation potentials were compared by counting the number of spores produced per unit area in unit time, 10 days, after inoculation. Two isolates of blast fungus which are pathogenic to all the 22 cultivars were used. The topmost leaves of the main stem and the primary tiller were inoculated. Lesion areas of resistant (R) cultivars were always larger than those on susceptible (S) ones at the 10-leaf stage, and the difference in the sporulation potentials of lesions among the cultivars became distinct 10 days after inoculation. Sporulations of larger lesions were more abundant than those of smaller ones. Sporulation potentials per 30 mm2 of lesion areas differed among the cultivars, i.e., lower in R cultivars, 'Todorokiwase' and 'Yoneshiro', than in S cultivars, 'Kusabue' and 'Aichi-asahi'. The potential was high on upland rice 'Norin 12', despite its smaller lesion area. Difference in the sporulation potential was not clear enough at the 5-leaf stage, became fairly distinct at 6-leaf stage and prominent at the 8-leaf stage.

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Accession: 000752612

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