抗性品种对预防水稻条纹叶枯病发生和流行的研究

Effects of Varietal Resistance in Preventing the Occurrence and Epidemic of Rice Stripe Disease:

：２８～３０℃条件下，用相同数量、带毒率为５０～５１％的灰飞虱经卵毒虫，分别接种于抗水稻条纹叶枯病品种与感病品种上，表明品种间的抗性由种质决定；抗性品种的发病潜育期为１０～１３天，起始发病率为２５～３５％，最终发病率为２４～３５％，卷叶症状０～２５％；感病品种发病潜育期为５～６天，起始发病率为１７５～３３０％，最终发病率为８７～１００％，卷叶症状７０～９０％；介体昆虫在感病品种上的繁殖率分别为抗病品种盐粳２０、中国９１的１６５和１６１。

At 28～30℃, rice stripe viruses (RSV) were inoculated into grain buds of resistant and susceptible varieties respectively with equal Laodelphax striatella, 50～51% of which are viruliferous. It is showed that the varietal resistance is decided by its plasma germ; the disese latent periods of resistant varieties are 10～13 days; the initial and the final disese incidences are 2.5～3.5% and 25～35%, respectively. These susceptible varieties are only 5～6 days for disease latent period, and their initial and final disease incidences are 17.5～33% and 87～100%, respectively. The ratio of vector number propagated in susceptible varieties to propagated in resistant ones is about 1.65.