复水后根系功能逐渐得到修复，进而产生补偿效应。

When re-watering, roots activity and function get repaired as well as bring out compensation.

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因为叶片功能上开始衰老的时期约在出苗后10多天，而根系功能衰老始期则为出苗后45天左右。

The morphological senescence of leave began only more than 10 days after the seedling emergence, but the senescence of the roots began at about 45 days after seedling emergence.

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在比较根系比较老旧的部分，一种变性的海绵状表皮称为根被有吸收潮气的功能。

In the older parts of the roots, a modified spongy epidermis called velamen has the function to absorb humidity.

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