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OALib Journal期刊
ISSN: 2333-9721
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转osepsps抗草甘膦水稻不同生境适合度及对稻田杂草的影响
DOI: 10.3724/SP.J.1145.2015.02027, PP. 897-903
Keywords: 转基因水稻,抗草甘膦,生态适合度,稻田杂草
Abstract:
携带适合度优势基因的转基因作物如果长期存活于栽培系统之外，抗性基因可能转移到野生近缘种并带来生态问题.以转osepsps基因水稻ep为材料，以非转基因受体“明恢86”为对照，通过田间定位试验，研究半野生生境下转osepsps基因水稻的营养生长、繁殖能力以及稻田杂草的种类、频度和密度等指标变化，分析转osepsps基因在半野生生境中的生态适合度以及对稻田杂草群落的影响.连续2年试验的结果显示：在常规栽培和半野生生境下，转基因稻与非转基因稻的株高、分蘖数、单株穗数、单株总粒数、单株实粒重和千粒重等指标没有显著差异；但结实率显著受环境影响，半野生生境下转基因水稻2年结实率为50.33%和17.72%，相比对照的68.82%和30.27%均显著下降（p<0.05）；2012年转基因稻单株实粒数为335粒，显著少于非转基因对照的548粒（p<0.05）.转基因稻与非转基因稻稻田的杂草种类均为9科9属9种；栽培稻田杂草密度和频度显著低于半野生稻田；相同生境下转基因稻与非转基因稻稻田杂草频度、密度总体上没有差异.本研究表明，与非转基因对照相比，转epsps基因稻生态适合度没有显著提高，在半野生生境下有所下降，其生态风险不高于栽培稻.
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