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They measured how long it took for two varieties of corn plants to move water from their roots to their lower leaves,and then to their upper leaves.For one plant,it took 80 minutes,c on aver- age,to move water from its fourth to its ninth leaf.The other plant did this in only 28 minutes. Elizabeth Lee,a plant scientist in Canada says as plants take up water from the soil,water vapor escapes from tiny holes in their leaves.Some varieties of corn close their leaves'hole faster than others when the soil is dry.This helps them conserve water and better survive drought.The new sensor is "a nice way to easily identify which varieties are better at conserving water,' observes Lee. Dong says the next step in his research is to use the sensor