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  • 1 INSTITUTE OF CROP GERMPLASM RESOURCES, CHINESE ACADEMY OF AGRICULTURAL SCIENCES BEIJING, CHINA
  • 2 INSTITUTE OF CROP GERMPLASM RESOURCES, CHINESE ACADEMY OF AGRICULTURAL SCIENCES BEIJING, CHINA
  • 3 DEPARTMENT OF AGRONOMY, SHANXI AGRICULTURAL UNIVERSITY TAIGU, SHANXI PROVINCE, CHINA
  • 4 INSTITUTE OF CROP GERMPLASM RESOURCES, CHINESE ACADEMY OF AGRICULTURAL SCIENCES BEIJING, CHINA
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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 cultivatedvarieties (O. sativa), interspecific hybrids were produced and anther culture was used toaccelerate the procedure of resistance breeding. Anther culture efficiency depended onboth the medium and the genotype of the cultivated varieties and the wild species. Afterinoculation with a mixture of six strains with wide spectrum virulence, all the F1 hybridswere resistant to blast; the F2 plants segregated, from high resistance to susceptibility, anda similar result was obtained for the H1 and H2 plants. At the H3 stage, blast resistancetended to be stable and almost 100% of inoculated H5 plants were highly resistant to riceblast. For agronomic characteristics, the F2 and H1 showed segregation, but no significantdifferences were seen between the cultivated parents and the H2 to H5 generations. Theresults demonstrate that blast resistance genes can be transferred from wild rice speciesinto cultivated varieties through crossing and anther culture, and the H5 can be used asstable lines in future breeding programmes.

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