Performance of Hybrids between Weedy Rice and Insect-resistant Transgenic Rice under Field Experiments: Implication for Environmental Biosafety Assessment
Performance of Hybrids between Weedy Rice and Insect-resistant Transgenic Rice under Field Experiments: Implication for Environmental Biosafety Assessment
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杂草稻与抗虫转基因稻杂交稻的田间试验表现：对环境生物安全评价的启示
DOI：
10.1111/j.1744-7909.2009.00877.x
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发表时间：
2009-12-01
影响因子：
11.4
通讯作者：
Lu, Bao-Rong
中科院分区：
文献类型：
--
作者：
Cao, Qian-Jin;Xia, Hui;Lu, Bao-Rong
转基因水稻通过基因流从转基因水稻逃逸到杂草水稻中，可能会造成不良的环境后果。评估杂草杂交种的田间表现将有助于我们了解作物基因(包括转基因)潜在地导入杂草水稻种群，从而进行有效的生物安全评估。对3个杂草水稻品系及其与2个转不同抗虫基因转基因水稻品系(CpTI或Bt/CpTI)的比较研究表明，杂草杂交种的相对表现比杂草杂交稻亲本高，单株分蘖、穗数和小穗数多，千粒重高，尽管杂草杂交稻的单株籽粒产量低于杂草亲本。杂交种F-1种子发芽率和出苗率均高于杂草亲本，且与千粒重呈正相关。在我们的田间试验中，杂草杂交种表现出比杂草水稻亲本更好的相对表现。这些发现表明，转基因水稻的转基因可以在F-1杂交种的相对适合度略有增加的情况下，通过反复的作物到杂草的基因流动，持续进入杂草水稻种群。
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.