Acta Agronomica Hungarica (2001) 49, 329-336

Q. Yang, H. Pang, Y. Song and X. Liu (2001)
Transfer of blast resistance from wild rice species into cultivated varieties (O. sativa) with anther culture
Acta Agronomica Hungarica 49 (4), 329-336
Abstract: Some wild species of the genus Oryza such as O. rufipogon and O. longistaminata show a high level of resistance to pests and diseases including rice blast (caused by Magnaporthe grisea). To transfer blast resistance from wild species into cultivated varieties (O. sativa), interspecific hybrids were produced and anther culture was used to accelerate the procedure of resistance breeding. Anther culture efficiency depended on both the medium and the genotype of the cultivated varieties and the wild species. After inoculation with a mixture of six strains with wide spectrum virulence, all the F₁ hybrids were resistant to blast; the F₂ plants segregated, from high resistance to susceptibility, and a similar result was obtained for the H, and H₂ plants. At the H₃ stage, blast resistance tended to be stable and almost 100% of inoculated HS plants were highly resistant to rice blast. For agronomic characteristics, the F₂ and H₁ showed segregation, but no significant differences were seen between the cultivated parents and the H₂ to H₅ generations. The results demonstrate that blast resistance genes can be transferred from wild rice species into cultivated varieties through crossing and anther culture, and the H₅ can be used as stable lines in future breeding programmes.
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Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pyricularia oryzae	Rice (Oryza)