Question

why lower leaves show wilting earlier than the upper ones

Answer 1

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When the soil of a plant runs too low of available water, the water chains in the xylem become thinner and thinner due to less water. ... When this happens, the plant loses its turgidity and begins to wilt. Low soil moisture is often the reason this happens but other factors play a role.

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Answer 2

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Wilting is the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. Wilting also serves to reduce water loss, as it makes the leaves expose less surface area.