The factors associated with race nonspecific resistance of Seomjinbyeo to rice blast (Pyricularia oryzae CAV.)
1990
Ryu, J.D. | Lee, E.J. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Institute) | Oh, J.H. (Dankook Univ., Univ., Cheonan (Korea R.). Coll. of Agriculture)
The factors such as lesion number, sporulation, degree of hyphal growth and dwarfing index associated with race nonspecific resistance of six rice varieties inoculated with four races of Pyricularia oryzae were compared and tested at blast nursery and in lowland during the period of vegetative stage of rice plant. Seomjinbyeo and Sangpungbyeo showed very slow disease progress curve at blast nursery compared with the other varieties, while Jinjubyeo and Nagdongbyeo showed rapid disease progress curve. Degree of dwarfing index was varied with test varieties inouclated by one time of punch inoculation at the 4th leaf stage of rice plant. Jinjubyeo showed high correlation coefficient (r=0.906) between dwarfing index and lesion length while Seomjinbyeo showed low correlation coefficient (r=0.467). Seomjinbyeo exhibited low degree of hyphal growth to all races whereas Jinjubyeo and the other varieties varied with test races. Number of lesion produced on test varieties by spray inoculation varied with races of P. oryzae. Accordingly moer number of spores were produced on Jinjubyeo, Sangpungbyeo and Fukuhikari by inoculation with specific races, while Seomjinbyeo showed less sporulation than the other varieties. There was a high correlation in the incidence of blast disease between blast nursery and lowland. It was assumed that Seomjinbyeo known as race nonspecific resistant variety showed fewer number of lesions and less sporulation and lower degree of hyphal growth in the host than those of the rest varieties
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