不同盐分与水分胁迫对灰绿藜种子萌发效应研究

Effects of salt and water stress on the seed germination of Che nopodium glaucum L.

不同盐分与水分胁迫对灰绿藜种子萌发试验研究结果表明,>0 0 5mol/ L(PEG 6 0 0 0溶液渗透势为- 0 .2MPa)浓度盐溶液对灰绿藜种子萌发有明显抑制效应,而较低浓度盐溶液(较低渗透势PEG 6 0 0 0溶液)对种子萌发有促进作用。不同盐溶液对种子萌发抑制程度依次为MgCl2 >Na2 SO4>Na2 CO3 >NaCl>复合盐溶液>MgSO4。PEG 6 0 0 0溶液渗透势≤- 0 .5MPa时对种子萌发抑制作用小于等渗NaCl溶液。未萌发种子复水试验结果表明一定程度盐分与水分胁迫不影响种子萌发潜力,其萌发恢复率随原处理溶液抑制程度的增加而增加;

The effects of different salts and water stresses on the seed germination of Chenopodium glaucum L. were studied. The results sh ow that th e seed germination percentage decreases significantly with salinity or os motic po tential increase when salt solution concentration is higher than 0 05 m ol/L or the osmotic potential of PEG solutions is lower than -0.2MPa.Germin ation of seed s treated by MgSO 4 is less affected and then the order is those by mixed salt, NaCl,Na 2CO 3, Na 2SO 4 and MgCl 2. In solutions with the osmotic potential of less tha n -0.5MPa,the seed germination percentage is lower in NaCl than that in is o osm otic PEG.After the non germinated seeds from all the treatments are transferred to distilled water, the finial germination percentage indicates that a certain d egrees of salt and water stress have no much effects on the seed germinati on pot ential ability.Basically the germination recovery percentage increases w ith an i ncrease of pre transfer salinity.The osmotic stress in wh ich seed germina tion ability is not hurtful varies with the kind of solutions.