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D Liang Dong,an electrical engineer at lowa State University and his team have created a stick-on,tape-based sensor(传感器 for plant leaves.It measures how much water a plant drinks up from the soil.With this information,plant breeders will know which individuals to choose as parent stock for crops that can survive droughts by making the most of the available water. When taped to a plant's leaf,the sensor can be attached to small wires.These connect to a battery and a device that can measure an electrical current ()That current will change depending on how fast water moves up the plant.This will reveal how quickly the plant drinks from the soil. The researchers tried out the plant sensor with corn plants.