GMO

Herbicide-resistant "superweeds" change their mating strategies over time, an evolutionary shift that helps them hold onto valuable genes and outcompete other plants, including herbicide-resistant genetically modified (GM) crops, according to a new study from University of Michigan.The study examined the relationships between plant mating systems and herbicide resistance in the common agricultural weed morning glory.The researchers found that morning glory populations that have evolved resistance to the herbicide Roundup rely on self-fertilization more than susceptible populations do.

There is a wave of revolt in the kingdom of GMOs. Driven by lower cereal prices, some US farmers are wondering if they still have an interest in growing genetically modified crops, which cost them up to twice as much to plant than conventional seeds. The debate on GMOs that is emerging in the United States is far removed from European concerns about public health and biodiversity. It’s about a completely different aspect: the return on investment.

A study of GMO cotton varieties shows they disrupt an important beneficial soil fungus, writes Eva Sirinathsinghji, apparently due to the Bt insecticide they are engineered to express. Disruption caused by the transgenic cotton to mycorrhizal fungi, and the wider soil ecosystem, may underlie the low yields and poor pest resistance now endemic among Bt GM crops.