NaCl对绿色与紫红色表型盐地碱蓬种子萌发的影响

bstract Suaeda salsa is a succulent halophyte. S. salsa plants are green (green phenotype: G) when they grows in saline soil far from the intertidal area and those are red-violet (red-violet phenotype: R) when they grow in intertidal area. In this paper, effects of NaCl treatment on seed germination of two S. salsa phenotypes were examined. The results showed that there were no significant differences in seed germination rate between two phenotypes compared to the control at low concentrations of NaCl (50, 100 mmol/L), and in the recovery percentage of red-violet phenotype S. salsa seeds and the green ones after the seeds which did not germinated at high concentrations of NaCl were transferred to distilled water for 4 days. However, the seed germination rates of both phenotypes were much lower at high concentrations of NaCl (400, 500 mmol/L）than those of the control. Red-violet phenotype seeds had higher germination potential and lower mean germination time than green ones. The contents of Na+ and K+ were not significantly different between two phenotype seeds and the seeds germinated in 200 mmol/L NaCl for 4d. In contrast, the contents of soluble sugar and soluble protein of both red-violet phenotype seeds and the seeds germinated in 200 mmol/L NaCl for 4d were significantly higher than those of the green ones. On other hand, Red-violet phenotype seeds were much heavier (per 1000 grains) and bigger than green ones. These results suggest that the red-violet phenotype seeds from the plants which grow in intertidal saline soil are able to germinate under salt stress, hypoxia and low temperature via accumulating more organic substances, especially organic compatible solutes during seed maturation and germination.