NaCl和PEG胁迫对金露梅种子萌发及幼苗的影响

为探讨NaCl、PEG处理对金露梅种子萌发和幼苗的影响，分别以0、40、80、120、160、200 mmol·L^-1浓度的NaCl溶液和0、100、125、150 、175、200、225、250、300 g·L^-1浓度的PEG溶液处理金露梅种子。结果表明，高于120 mmol·L^-1 NaCl溶液处理，对金露梅种子的萌发有明显抑制作用；40 mmol·L^-1的NaCl溶液抑制了金露梅幼苗生长。100～175 g·L^-1的PEG溶液处理金露梅种子，能促进种子萌发和幼苗胚根生长，而高于175 g·L^-1的PEG溶液处理，则对金露梅种子的萌发和幼苗生长具有明显的抑制作用。

Effects of NaCl and PEG Stress on Seed Germination and Seedling Growth of Potentilla fruticosa

Effects of salt and drought stress on the germination of Potentilla fruticosa seeds and the growth of the seedlings were examined. The NaCl concentrations were designed as 0, 40, 80, 120, 160 and 200 mmol·L^-1, the PEG concentrations were 0, 100, 125, 150, 175, 200, 220, 250 and 300 g·L^-1, respectively, and distilled water was used as the control. The results showed the seed germination was significantly inhibited by NaCl solution with the concentration of 120 mmol·L^-1 or higher, and the seedling growth was inhibited at 40 mmol·L^-1 or higher. PEG solution with low concentrations (100-175 g·L^-1) could promote seed germination and the growth of seedlings radicle, however, they were significantly inhibited at high concentrations (above 175 g·L^-1).