NaCl胁迫对紫花苜蓿种子萌发,幼苗生长及生理特性的影响

Effects of NaCl stress on seed germination and thephysiological characteristics of alfalfa seedling

摘要:

以紫花苜蓿种子为材料,利用培养皿开展种子发芽试验,研究不同浓度NaCl胁迫下种子的萌发及幼苗生长情况。结果表明:NaCl胁迫显著抑制紫花苜蓿种子萌发及幼苗的生长,对根的生长抑制性大于苗和全株;NaCl胁迫下,苜蓿幼苗体内保护性物质(超氧化歧化酶、脯氨酸和可溶性蛋白等)降低了丙二醛的水平。因此,苜蓿可通过自身生理调节作用,减轻NaCl胁迫对其的伤害。

Abstract:

Alfalfa seeds were germinated in the petri dishes.Seed germination and seedling growth were observed in response to different NaCl concentrations.The results showed that NaCl stress significantly inhibited seed germination and the seedling growth of alfalfa,with the inhibitory effects on roots were more severe than shoots.Under NaCl stress,the protective substances(i.e.SOD,proline and soluble protein)could be used to reduce the level of MDA.Therefore,alfalfa can reduce t NaCl stress by auto-physiological regulation,and grow in saline-alkali soil.