不同钠盐对班克松种子萌发的影响

采用不同浓度的NaCl、Na2SO4和Na2CO3溶液处理班克松种子,测定发芽率、发芽势和发芽指数,研究钠盐胁迫对班克松种子发芽的影响。结果表明:低浓度(10、20 mmol·L-1)的NaCl、Na2SO4可以促进种子萌发,随着浓度增加,抑制作用加强,250 mmol·L-1的各项指标降到最低。Na2CO3溶液对种子萌发有较强的抑制作用,浓度相同时,Na2CO3胁迫下的各指标值均小于NaCl、Na2SO4。250 mmol·L-1时各项指标为0。由此可以得出,班克松种子具有耐盐性,但对不同钠盐的敏感性不同,对NaCl、Na2SO4的耐受性要高于Na2CO3。

Effects of different sodium salt stresses on seed germination of Pinus banksiana

In the study, the effects of different sodium salt stresses on seed germination of Pinus banksiana were detected. The germi-nation energy,germination rate and germination index were measured after the seed was treated with NaCl, Na2SO4 and Na2CO3 solu-tions of different concentrations. The results showed that low-concentration（10,20 mmol · L-1）NaCl and Na2SO4 could promote the germination,and with the concentration increasing,the inhibitory effects increased. All indexes about seed germination were zero and reached the lowest level when the concentration was 250 mmol · L-1. Na2CO3 solution showed the stronger inhibitory effects on germi-nation. Under the same concentration, all indexes treated by Na2CO3 were lower than that of treated by NaCl,Na2SO4. Above all,the seed of Pinus banksiana is salinity tolerant, but shows different tolerance to different sodium salts. The seed tolerance of Pinus banksi-ana to NaCl and Na2SO4 was higher than that of Na2CO3.