Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, China.
J Integr Plant Biol. 2009 Dec;51(12):1138-48. doi: 10.1111/j.1744-7909.2009.00877.x.
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 insect-resistance 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 F(1) 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 F(1) hybrids.
通过基因流从转基因水稻向杂草稻的转移可能会带来意想不到的环境后果。评估作物-杂草杂种的田间表现将有助于我们了解作物基因（包括转基因）向杂草稻种群的潜在基因渗入，从而能够进行有效的生物安全评估。对三种杂草稻品系及其与两种含有不同抗虫转基因（CpTI 或 Bt/CpTI）的转基因水稻品系的杂种进行的比较研究表明，与杂草稻亲本相比，作物-杂草杂种具有更高的相对表现，植株更高，分蘖数、穗数和每株小穗数更多，千粒重也更高，尽管杂种每株的饱满种子数比杂草亲本少。F1 杂种的种子具有更高的发芽率，并产生比杂草亲本更多的幼苗，这与千粒重呈正相关。在我们的田间试验中，作物-杂草杂种的相对表现普遍优于其杂草稻亲本。这些发现表明，转基因水稻中的基因可以通过反复的作物向杂草的基因流，并借助 F1 杂种中相对适应性的略微增加，持续存在并渗入到杂草稻种群中。
