APPLICATION OF BAR-TRANSGENIC RICE IN BREEDING FOR HETEROSIS

Abstract:

Three bar-transgenic rices，Bengal Hu-10，Cypress PB-6，and Gulfmont as male parents，were crossed with 6 male sterile lines：Zhenshan 97A, Bo A，Pei-ai 64S，Nan xiang 95S，Xi 217S and GD 1-S. Eight restorers emasculated were crossed with the three herbicide-resistant sources．Forty-eight F₁ hybrids were obtained totally The results indicated that heterosis in these F₁ hybrids were not obvious By transferring herbicide (Liberty)-resistant bar gene into conventiona1 restorer 1ines, 3 restorer 1ines (Minghui 63-B，Ce 64一B．and Teqing-B)were developed via crossing，and 5 resistant combinations，i.e Zhenshan 97A／Minghui 63-B (B₂F₁-B), Zhenshan 97A／Ce64一B(B₂F₂-G)．Zhenshan 97A／Ce 64-B(B₃F₁-C)，Pei-ai 64S／Teqing-B(B₁F₂-C)．and Pei-ai 64S／Teqing-B(B₂F₁-B)，had been bred，which retained the same yielding level oftheir original combinations．The problems ofheterosis application，and the prospect of bar-transgenic rice parents in breeding for heterosis are discussed.