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KMID : 0379119770050010013
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Korean Journal of Mycology
1977 Volume.5 No. 1 p.13 ~ p.19
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An Histopathological Investigation on the Resistant Tong - Il Cultivar by Inoculating Rice Blast Fungus , Pyricularia oryzae Cav .
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Abstract
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In order to investigate histopathologically the nature of varietal resistance and infection process of the rice bast fungus, Pyricularia oryzae. this experiment was undertaken by using the resistant cultivar Tongil and susceptible cultivars Norin No.6 and Jinheung in 1973 to 1974.
1) It was found that appressorium of the fungus forms not only at 4 hours after incubation under the favor able conditions butalso peak of appressorial formation is at 48 hours treatment. Physical stimulus known to be a definite factor for appressorial formation. The optimum temperature range for appressorial infection was at 24℃ to 28℃, and pH was between 4.8 to 8.0 with 6.8 as the optimum.
2) Although percent of appressorial formation on the leaves of resistant Tongil and susceptiible Norin No.6 were only slightly different, there was a remarkable difference between resistant and susceptible cultivars with regard to percent of hyphal infection and index for hyphal extension. Index of hyphal extension was 1.6-2.7 in Tonyil. while in susceptible cultivar was 3.4-6.6. The rate of discoloration of infected cells, a indication of hypersensitivity, was greater in the resistant than in susceptible cultivar.
3) Therefore, it could be concluded that resistance of Tongil cultivar may be attributable to a higher degree of mechanical barriers as well as a higher level of antifungal substance accumulation.
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