旱生植物在正常的土壤环境条件下,脯氨酸含量并不高,为100—300μg/g(干重);当受到土壤水分胁迫时,脯氨酸大量迅速地累积,一般相对含量可达50%以上,绝对含量达每克干重数千微克。旱生植物体内脯氨酸的累积量和累积速度都远远高于中生植物。因此,认为旱生植物的抗旱特性与脯氨酸累积有关。 Under normal soil environmental conditions, the content of proline in the xerophytes is not high, which is 100-300μg / g (dry weight). When subjected to soil water stress, the proline rapidly accumulates in large quantities and the relative content is generally up to 50% or more, the absolute content of thousands of grams per gram dry weight. The accumulation and accumulation rate of proline in xerophytes are much higher than those in mesophytes. Therefore, it is considered that the drought resistance of xerophytes is related to the accumulation of proline.