Biodegradation of Cry1Ab Protein from Bt Transgenic Rice in Aerobic and Flooded Paddy Soils

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• 作者：Haiyan Wang ; Qingfu Ye ; Jay Gan ; Licheng Wu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：March 7, 2007
• 年：2007
• 卷：55
• 期：5
• 页码：1900 - 1904
• 全文大小：190K
• 年卷期：v.55,no.5(March 7, 2007)
• ISSN：1520-5118

文摘

Degradation of Cry1Ab protein from Bt transgenic rice was examined under both aerobic and floodedconditions in five paddy soils and in aqueous solutions. The hydrolysis rate of Cry1Ab protein inaqueous solutions was correlated inversely with the solution pH in the range of 4.0 to 8.0, and positivelywith the initial concentration of Cry1Ab protein. Rapid degradation of Cry1Ab protein occurred inpaddy soils under aerobic conditions, with half-lives ranging from 19.6 to 41.3 d. The degradationwas mostly biotic and not related to any specific soil property. Degradation of the Cry1Ab proteinwas significantly prolonged under flooded conditions compared with aerobic conditions, with half-lives extended to 45.9 to 141 d. These results suggest that the toxin protein, when introduced into apaddy field upon harvest, will probably undergo rapid removal after the field is drained and exposedto aerobic conditions.