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plants in the water deficit is serious, cells lose puffing pressure, stems, leaves sagging phenomenon. If the wilting plant after the steaming effect is reduced, it can reduce or eliminate the water deficit and restore the original condition, called temporary wilt, due to the lack of available water in the soil, the steaming effect is reduced, the plant still maintains a wilting state, called permanent wilt. At this time, the root hair withered, if in a short period of time water supply, root hair can also be re-generated, otherwise the root system can not restore the water absorption function, so that the plant due to lack of water and death.