Abstract
Bollwarm has been a serious problem in cotton production in China since the 1990th. To breed transgenic pest-resistant cotton variety is one of the most economic measures. Bivalent insect-resistant Bt + CpTI gene transgenic cotton variety possesses stronger pest resistance compared with Bt cotton. CCRI 41 is an insect-resistant gene transgenic cotton variety bred by Cotton Research Institute, Chinese Academy of Agricultural Sciences. A bivalent insect-resistant Bt+CpTI gene was transformed into a high-performance conventional cotton variety, and stable and high-performance transgenic lines were selected using stress-resistance screening and molecular assistant selection strategies. It was the first national released bivalent insect-resistant transgenic cotton variety in China. The cumulative extension acreage of CCRI 41 has reached 3 million ha extensive popularization of CCRI 41 since 2002 in 6 provinces in Yellow River Valley and has reaped economic benefits of 4.5 billion RMB yuan in total. These scientific achievements won the 2009 State Science and Technology Awards of China (2nd prize).
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