复合钠盐胁迫对沙棘种子萌发的影响

Stress effects of Complex Sodium Salt on the Germination of Hippophae rhamnoide Seeds

研究了沙棘(Hippophae rhamnoides)种子萌发对不同浓度(0、20、50、80、100、150、200mmol/L)复合钠盐(NaCl、Na2CO3和Na2SO4)胁迫的响应。结果表明,盐胁迫显著抑制沙棘种子的萌发,20、50、80、100和150mmol/L等不同浓度盐胁迫下的萌发率分别为84.44%、55.56%、32.22%、20.00%和4.44%,均极显著低于对照(100%,P<0.01),而且萌发进程减慢,200mmol/L盐胁迫处理的种子全部不能萌发。未经盐胁迫处理种子具有较高的萌发指数(11.43)和活力指数(291.32),二者均随盐胁迫浓度的提高而减小,而且不同盐浓度间均差异显著(P<0.05)。

The stress effects of different concentrations（0,20,50,100,200 mmol/L） of complex sodium salt （NaCl, Na2CO3 and Na2SO4） on the germination of Hippophae rhamnoide seeds were investigated. The results demonstrated that the seed germination was significantly inhibited by the salt stress. Germination percentages of seeds stressed at the concentration of 20,50,80,100 and 150 mmol/L complex sodium salt were 84.44%, 55.56%, 32.22%, 20.00% and 4.44% respectively and they were significant lower than that of control （P〈0.01）. A delay of germination course was observed for all stressed seeds compared with that of control and all the seeds did not germinate under 200 mmol/L salt stress The germination index （11.43） and vigor index （291.32） under control were higher significantly than those of all salt stress treatments. With the increase of salt concentrations, both germination index and vigor index reduced, and significance were observed among different treatments of salt concentration （P〈0.05）.