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J Integr Plant Biol, 51 (12): 1138-1148, Research Article
Performance of Hybrids between Weedy Rice and Insect-resistant Transgenic Rice under Field Experiments: Implication for Environmental Biosafety Assessment
Qian-Jin Cao, Hui Xia , Xiao Yang and Bao-Rong Lu**
Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, China
**Author for correspondence Tel(Fax): +86 21 6564 3668; E-mail: and

Transgene escape from genetically modified (GM) rice into weedy rice via gene flow may cause undesired environmental consequences. Estimating the field performance of crop-weed hybrids will facilitate our understanding of potential introgression of crop genes (including transgenes) into weedy rice populations, allowing for effective biosafety assessment. Comparative studies of three weedy rice strains and their hybrids with two GM rice lines containing different insectresistance transgenes (CpTI or Bt/CpTI) indicated an enhanced relative performance of the crop-weed hybrids, with taller plants, more tillers, panicles, and spikelets per plant, as well as higher 1 000-seed weight, compared with the weedy rice parents, although the hybrids produced less filled seeds per plant than their weedy parents. Seeds from the F1 hybrids had higher germination rates and produced more seedlings than the weedy parents, which correlated positively with 1 000-seed weight. The crop-weed hybrids demonstrated a generally enhanced relative performance than their weedy rice parents in our field experiments. These findings indicate that transgenes from GM rice can persist to and introgress into weedy rice
populations through recurrent crop-to-weed gene flow with the aid of slightly increased relative fitness in F1 hybrids.

Cao QJ, Xia H, Yang X, Lu B-R (2009). Performance of hybrids between weedy rice and insect-resistant transgenic rice under field experiments: Implication for environmental biosafety assessment. J. Integr. Plant Biol. 51(12), 1138–1148.

Received: 02 July 2009      Published: 26 November 2009
© 2009 Institute of Botany, Chinese Academy of Sciences
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