不同盐分对黄花苜蓿早期幼苗生长及离子积累的影响

Effects of Different Salinity on Growth and Ion Accumulation of Early Medicago falcata Seedlings

为探讨盐胁迫对黄花苜蓿早期幼苗生长及离子积累的影响,选用两种中性盐(NaCl、Na2SO4)和两种碱性盐(Na2CO3、NaHCO3)对黄花苜蓿进行处理,测定黄花苜蓿早期幼苗的胚根、胚轴长度和体内Na+、K+含量。结果表明:随着盐胁迫浓度的升高,幼苗胚根和胚轴的长度显著降低。盐胁迫对黄花苜蓿幼苗胚根生长的抑制作用要高于对胚轴的。与中性盐相比,碱性盐对黄花苜蓿幼苗生长的抑制作用更强。盐胁迫显著增加黄花苜蓿早期幼苗体内Na+的积累,胁迫条件下幼苗体内K+含量与对照之间没有显著差异。黄花苜蓿幼苗能够通过离子调节适应较低浓度的中性盐和碱性盐胁迫。

Two neutral salts(NaCl、Na2SO4)and two alkaline salts(Na2CO3、NaHCO3)were used to evaluate the effects of salt stress on growth and ion accumulation of early Medicago falcata seedlings.The length of radice and hypocotyl,and the contents of Na+and K+content were determined.The results showed that the length of radicle and hypocotyl decreased significantly with the increase of salt concentration.The inhibition of salt stress on radicle growth of M.falcata seedlings was stronger than that on the hypocotyl growth.The inhibition of alkaline salt on the growth of M.falcata seedlings was stronger than that of neutral salt with the same Na+concentration.Salt stress significantly increased the accumulation of Na+in early seedlings,and there was no significant difference in K+content between stress and control treatment.The seedlings of M.falcata can adapt to low concentration of neutral and alkaline salt stress through ion regulation.