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OALib Journal期刊
ISSN: 2333-9721
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不同虫压下转bt基因水稻与非转基因水稻生态适合度差异
DOI: DOI: 10.3724/SP.J.1145.2012.00035, PP. 35-41
张富丽, 刘勇, 佟洪金, 尹全, 陶李, 王东, 周西全, 常丽娟, 宋君, 刘文娟, 雷绍荣, 郭灵安
Keywords: 生态适合度,抗虫性,转基因水稻,虫压,基因扩散,生态风险
Abstract:
为了解转基因水稻的基因扩散效率和潜在生态风险，以转bt抗虫水稻bt63、r1、r2和非转基因常规水稻ⅱ优838为试材，采用高、低两个不同虫害胁迫水平和转基因与非转基因水稻相间种植方式，通过观察水稻植株营养生长、结实以及对螟虫危害的抗性表现等差异，研究比较了bt外源基因插入后对水稻植株适合度的影响.结果表明：在低虫害胁迫条件下，转bt基因水稻在植株分蘖数、生物量鲜重等营养生长指标方面与非转基因对照品系间无明显差异，但株高、穗长、穗重等指标不及对照，且r2和bt63与对照间差异显著；在高虫害胁迫条件下，3个转bt基因水稻品系的分蘖数、穗长、穗重等指标明显高于对照.而不同转基因品系株高适合度效应不同，这可能与受体本身的特性相关.3种转基因水稻的单株结实粒数、千粒重与对照在两种虫害胁迫条件下均无显著性差异，bt基因对受体植株的结实影响不明显.在高虫害胁迫条件下，3种转bt基因水稻的抗虫能力均显著优于非转基因水稻，表明bt基因对受体植株的抗虫性影响显著.同时，本研究结果还表明转bt基因水稻的适合度代价较小，预示了抗虫转基因水稻外源bt基因在一定环境条件下具有逃逸的可能，但这种风险比较小.图3表2参27
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