Scientists at the King Abdullah University of Science and Technology in Saudi Arabia have found that treating crop seeds with a microbe derived from desert plant roots can increase crop tolerance to drought. Through the DARWIN21 program, the researchers have isolated over 10,000 strains of desert microbes and tested hundreds of them to find those that significantly increase plant drought tolerance. The microbe, known as SA190, alters the epigenetic status of drought stress genes, activates them only when needed, and increases the plant's water use efficiency.