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Resistance of cotton bollworm to Bt cotton plants involves more diverse genetic changes than expected, a research team led by Prof.Wu Yidong in Nanjing Agricultural University reports in the journal PNAS(109:10275—10280,June 26 of 2012).This work was funded by an NSFC project(grant no.31071983). To reduce reliance on insecticide sprays,cotton and corn have been genetically engineered to produce insect-killing proteins derived from the bacterium Bacillus thuringiensis(Bt).In 2011,farmers worldwide grew 160 million acres of Bt cotton and Bt corn.The percentage of cotton acreage planted with Bt cotton has exceeded 90%since 2004 in northern China.Although Bt cotton has helped to suppress pests,de-
Resistance of cotton bollworm to Bt cotton plants involves more diverse genetic changes than expected, a research team led by Prof. Wu Yidong in Nanjing Agricultural University reports in the journal PNAS (109: 10275-10280, June 26 of 2012). This work was funded by an NSFC project (grant no. 31071983). To reduce reliance on insecticide sprays, cotton and corn have been genetically engineered to produce insect-killing proteins derived from the bacterium Bacillus thuringiensis (Bt) .In 2011, farmers worldwide grew 160 million acres of Bt cotton and Bt corn. The percentage of cotton acreage planted with Bt cotton has exceeded 90% since 2004 in northern China. Although Bt cotton has helped to suppress pests, de-