Have you ever wondered just how much water plants need to grow, or indeed why they need it? Plants lose a lot of water when they take in carbon dioxide from the atmosphere, so they need up to 300 grams of water to make each gram of dry plant matter.
, we report on a natural secret that could ultimately be used to help plants thrive while using less water.Plants are mostly made up of water – about 80 percent by weight. So we might expect plants would need around four grams of water for each gram of dry mass to achieve their ideal level of hydration.
Because almost all the water plants take up from the soil through their roots soon rises out into the atmosphere through their leaves. This is because we assumed the air in small pockets inside the leaves was fully saturated with water vapor . But we also made this assumption because we had no method of directly measuring the relative humidity of the air inside leaves. over the past 15 years, we have accumulated evidence that this assumption is not correct.
This means the rate of water loss from the leaves stayed constant, even as the air outside increased its"evaporative demand" . Our next experiments will test whether aquaporins are indeed the mechanism behind the behavior that we observed.
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