Genetic Characteristics of Progeny of the Hybrids Between a Glufosinate Resistant Transgenic Rice and Weedy Rice (Oryza sativa L.)

Experiments were conducted for four consecutive yeary (2004~2007) in the greenhouse of Experiment and Practice Sation, Kyungpook National University to determine genetic characteristics of the hybrids in the succeeding generations. F₁ hybrids were obtained by crossing weedy rice with the glufosinate-ammonium resistant lines harboring ABC-promoter and ubiquitin promoter transegenic lines, respectively. F₁ hybrid obtained from crossing between weedy rice and ABC-promoter transgenic rice found to have greater chances of genetic integration because of its higher rate of spikelet fertility. The response to the recommended dose of glufosinate-ammonium at 30 DAS (days after seeding) in F₂ followed Mendelian pattern of segregation. This indicated that herbicide-resistant trait acquired from transgenic lines introgressed in the progeny generations. The days to heading and maturity in F₁ was delayed by as much as 30 days than the both parents. However, heading/flowering of F₂ was found highly variable, with approximately one fourth of the tillers maturing earlier like that of weedy rice parent. In this study, segregation to glufosinate response, heading dates, and shattering of seeds in F₁, F₂ and F₃ were acquired from weedy parent.