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1979和1980两年,我们先后对本所收藏的800多个水稻品种(系) 在田间进行了白叶枯病的抗性鉴定.由于接种叶位仅限于剑叶,而水稻品种生育期参差不齐,使接种时间自6月下旬一直延续到8月底.后期接种,温湿度均不能很好满足发病要求,因而潜育期延长(8—9) 天,病斑扩展速度减缓;尽管采取延长病情检查的期限试图弥补,但有时接种鉴定结果仍不能真实地反应品种的抗性类型.例如,我所两系杂交水稻恢复系的四个品系,在1979年9月上旬的抗性鉴定中表现为中抗类型、其中泾紫×24—5的抗性为2.2级(五级制,下同),科6选—7—(4) 为2.6级,科6选—17为2.1级,科6选—2—3为2.6t级;而它们的亲本在7月上旬的鉴定中均表现为感病类型,如
In 1979 and 1980, we identified the resistance of the more than 800 rice cultivars (lines) in the field to the bacterial blight in the field, and the inoculation position was limited to the flag leaf while the rice variety had a different growth period , So that the inoculation time from late June until the end of August. Late seeding, temperature and humidity can not meet the requirements of the disease well, so the latent period extended (8-9) days, the lesion spread slowed; despite the extension of the disease check Of the period of attempts to make up, but sometimes the results of inoculation tests still can not truly reflect the type of resistance of the cultivars.For example, four strains of two lines of rice restorer lines in our two lines, in the early September 1979 resistance identification as Anti-type, which Jing purple × 24-5 resistance to 2.2 (five-level system, the same below), Section 6 -7- (4) for the 2.6, Section 6 for -17 for 2.1, Section 6 -2-3 for the 2.6 t level; and their parents in early July identification showed the type of susceptibility, such as