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Effects of insect-resistance transgenes on fecundity in rice (Oryza sativa, Poaceae): A test for underlying costs

文献类型： 外文期刊

作者： Chen, LY 1 ; Snow, AA 2 ; Wang, F 2 ; Lu, BR 2 ;

作者机构： 1.Fudan Univ, Inst Biodivers Sci, Minist Educ Key Lab Biodivers & Ecol Engn, Shanghai 200433, Peoples R China

2.Fudan Univ, Inst Biodivers Sci, Minist Educ Key Lab Biodivers & Ecol Engn, Shanghai 200433, Peoples R China; Ohio State Univ, Dept Evolut Ecol & Organ Biol, Columbus, OH 43210 USA; Fujian Acad Agr Sci, Fujian Prov Key Lab Genet Engn Agr, Fuzhou 350003, Peoples R China

关键词： fecundity;fitness;gene flow;genetically modified;insect resistant;Oryza sativa;transgene;yield cost

期刊名称：AMERICAN JOURNAL OF BOTANY （ 影响因子：3.844； 五年影响因子：3.657 ）

ISSN： 0002-9122

年卷期： 2006 年 93 卷 1 期

页码：

收录情况： SCI

摘要： Understanding the balance between yield benefits and possible underlying yield costs that are associated with transgenic cultivars is useful for evaluating crop performance and the fitness of crop-wild hybrid progeny, but few researchers have tested for such costs under rigorous experimental conditions. We examined shifts in net costs and benefits of in sect-resistance transgenes in cultivated rice (Oryza sativa) using two levels of insect pressure (low vs. moderate) and two types of competition (pure vs. mixed lines). We compared the growth and fecundity of potted rice plants from three transgenic lines, Bt, CpTI, and Bt/CpTI, relative to isogenic control plants at outdoor locations in Fuzhou, China. Net yield costs were detected, but only in Bt/CpTI plants in mixed-line competition with low insect pressure. These plants produced 16% fewer tillers, 6% smaller seeds, and 30% fewer seeds than competing control plants. Under moderate insect pressure, Bt and Bt/CpTI plants produced 36-65% more seeds than controls, but the net benefit for Bt/CpTI plants disappeared in mixed-line competition pots. To our knowledge, this is the first report of yield costs in cultivars with transgenic insect resistance. Our results suggest that these costs may be negligible in monotypic rice fields, especially when target insects are abundant.

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