外源维生素对高NaCl胁迫下紫花苜蓿种子萌发及恢复性的影响

为给改进紫花苜蓿在盐碱地区的生产提供依据，笔者研究了14610 mg/L高浓度NaCl胁迫下，外源水溶性维生素（VB₁、VB₂、VPP、VB₆、VH、VB₁₂与VC）对紫花苜蓿种子萌发及恢复萌发性状的影响。结果表明：62.5 mg/L VPP显著提高了恢复萌发后的芽鲜重，1000 mg/L VB₆、500 mg/L VB₁₂和1000 mg/L VC促进了紫花苜蓿高盐胁迫下的萌发，但对胁迫减轻后的恢复萌发没有显著影响。250 mg/L VB₁₂对高盐胁迫下紫花苜蓿的萌发及恢复萌发均有显著性改进，使高NaCl的致死性从19.667%降低到4.667%。VB₁、VB₂和VH未能有效改进高NaCl胁迫对萌发的抑制效应。试验显示外源VB₆、VB₁₂、VC对高NaCl胁迫下紫花苜蓿种子的萌发特性有一定程度的调节作用。

Effects of Exogenous Vitamins on Seed Germination and Recovery of Medicago sativa L. Under High NaCl Stress

In order to provide basis for the production of Medicago sativa L. in saline-alkali soil, the author assessed the effect of exogenous water-soluble vitamins (VB₁, VB₂, VPP, VB₆, VH, VB₁₂ and VC) on the seed germination and recovery of M. sativa under 14610 mg/L NaCl stress. The results showed that 62.5 mg/L VPP significantly increased the shoot fresh weight after the recovery germination. 1000 mg/L VB₆, 500 mg/L VB₁₂ and 1000 mg/L VC substantially promoted the germination under high salinity stress, but had no significant impact on the recovery germination after the stress was relieved. 250 mg/L VB₁₂ significantly improved both the germination under high NaCl stress and the recovery germination, reduced the mortality rate under high NaCl stress from 19.667% to 4.667%. VB₁, VB₂ and VH failed to effectively alleviate the inhibitory effect of high NaCl stress on seed germination. The experiment showed that exogenous VB₆, VB₁₂ and VC could play a role in regulating the seed germination characteristic of M. sativa under high NaCl stress.