华北景天叶片有机渗透调节物质对水分胁迫的响应

The Response of Organic Osmoregulatory Substance of Sedum tatarinowii Leaves to Water Stress

试验以华北景天为试材,采用人工控水方法,研究了不同水分胁迫强度对华北景天叶片有机渗透调节物质的影响。结果表明:在水分胁迫下,华北景天叶片中游离脯氨酸和可溶性糖含量变化不明显,可溶性蛋白含量变化显著。华北景天可通过可溶性蛋白的渗透调节作用,降低细胞的渗透势,维持细胞膨压,从而保证干旱条件下细胞的正常生长与代谢。所以,可溶性蛋白是水分胁迫条件下华北景天叶片细胞内重要的渗透调节剂。

The response of organic osmoregulatory substance of Sedum tatarinowii leaves to water stress was studied under manual controlling soil water environments.The results showed that the contents of free proline and soluble sugar appeared unremarkable changed,but the content of soluble protein appeared remarkable increasing trend under water stress.The cell osmotic potential was reduced and the cell turgor was maintained through the osmoregulatory of soluble protein in the leaves of Sedum tatarinowii.Thus normal growth and metabolism of cell were kept under water stress.The soluble protein was an important organic osmoregulatory substance of Sedum tatarinowii leaves under water stress.