Characterization of competitive interactions in the coexistence of Bt-transgenic and conventional rice.
Characterization of competitive interactions in the coexistence of Bt-transgenic and conventional rice.
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DOI：
10.1186/s12896-015-0141-0
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发表时间：
2015-04-26
影响因子：
3.5
通讯作者：
Li J
中科院分区：
文献类型：
--
作者：
Liu Y;Ge F;Liang Y;Wu G;Li J
通过花粉和种子的转基因流动导致自然界中的转基因志愿者和野生种群，消费者的选择和经济激励决定了转基因作物是否会在田间种植。转基因植物和非转基因植物很可能在田间和自然生境中共存，但它们之间的竞争相互作用尚不清楚。田间试验在喷洒杀虫剂的农业生态系统和自然生态系统中进行，使用Bt转基因水稻（Oryza sativa）和其非转基因对应物在纯林和混交林中具有替换系列。在转基因水稻与常规水稻共存的条件下，虫害和竞争显著降低了植株的生长和繁殖。无论在农业生态系统还是自然生态系统中，在不同密度下，无论是否有虫害，转基因抗虫水稻都没有竞争性上级优势。转Bt基因表达的适应性成本只发生在农业生态系统中，随着转基因水稻比例的增加，群体产量下降。在自然生态系统中，种群产量是波动的，在植物竞争或昆虫压力下，纯林和混交林的种群产量略有差异。二化螟感染的存在增加了非靶标昆虫的数量。转基因水稻和非转基因水稻在农业生态系统中可以共存，但在自然生境中，转基因水稻的竞争力可能高于非转基因水稻。
Transgene flow through pollen and seeds leads to transgenic volunteers and feral populations in the nature, and consumer choice and economic incentives determine whether transgenic crops will be cultivated in the field. Transgenic and non-transgenic plants are likely to coexist in the field and natural habitats, but their competitive interactions are not well understood. Field experiments were conducted in an agricultural ecosystem with insecticide spraying and a natural ecosystem, using Bt-transgenic rice (Oryza sativa) and its non-transgenic counterpart in pure and mixed stands with a replacement series. Insect damage and competition significantly decreased plant growth and reproduction under the coexistence of transgenic and conventional rice. Insect-resistant transgenic rice was not competitively superior to its counterpart under different densities in both agricultural and natural ecosystems, irrespective of insect infection. Fitness cost due to Bt-transgene expression occurred only in an agroecosystem, where the population yield decreased with increasing percentage of transgenic rice. The population yield fluctuated in a natural ecosystem, with slight differences among pure and mixed stands under plant competition or insect pressure. The presence of Chilo suppressalis infection increased the number of non-target insects. Plant growth and reproduction patterns, relative competition ability and population yield indicate that Bt-transgenic and non-transgenic rice can coexist in agroecosystems, whereas in more natural habitats, transgenic rice is likely to outcompete non-transgenic rice.
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Haag, JJ;Coupe, MD;Cahill, JF
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