Survival Competitiveness Between Common Wild Rice and the F₁ Hybrids of Its Cross with bar Transgenic Rice

Key words: 
• transgenic rice /
• bar /
• common wild rice /
• F₁ hybrids /
• survival competitiveness

Abstract: Yacheng,Wanning and Dongfang populations of common wild rice （Oryza rufipogon Griff） were crossed with bar transgenic rice B2 （male parent） to produce F1 hybrids （"Bar-wild hybrids"）. The growth competition between the common wild rice and the Bar-wild hybrids was analyzed by comparing their performance in seed viability,growth characteristics,seed set,regeneration ability and other key agronomic traits under field conditions. The Bar-wild hybrids generally had a higher germination rate than the common wild rice. The Bar-wild hybrids were not much different in flag leaf area and tiller number from the common wild rice in monoculture but had higher relative competitiveness ability than the common wild rice in mixed culture. The Bar-wild hybrids generally had a high seed set percentage but had a lower ratooning rate （regeneration of the stubbles） than the common wild rice.