Effect of Exogenous Gibberellin on Wheat Seed Germination under Salt Stress

[Objectives] In this experiment, wheat seeds were treated with different concentrations of gibberellin and different concentrations of salt solution to study the change of germination index of wheat seeds. [Methods] The germination rate, germination potential and germination index of wheat seeds were measured by routine methods, and the effect of exogenous gibberellin on germination of wheat seeds under salt stress was observed. [Results] The germination rate, germination potential and germination index of wheat seeds under salt stress were significantly increased after exogenous treatment of 0.25 and 0.50 g/L gibberellin within the range of salt concentration gradient. However, when the concentration of gibberellin was too high, it would inhibit the germination of seeds. [Conclusions] Appropriate concentration of gibberellin can effectively alleviate the stress caused by salt on wheat seed germination. In this experiment, the best concentration of gibberellin to alleviate salt stress was 0.25 g/L.

[目的] 本实验通过不同浓度赤霉素与不同浓度盐溶液处理小麦种子，探究其萌发指数的变化规律。[方法] 采用常规方法测定小麦种子的发芽率、发芽势及萌发指数，观察盐胁迫下外源赤霉素对小麦种子萌发的影响。[结果] 在盐浓度梯度范围内，经0.25 g/L和0.50 g/L外源赤霉素处理后，盐胁迫下小麦种子的发芽率、发芽势及萌发指数均显著提升；但当赤霉素浓度过高时，则会抑制种子萌发。[结论] 适宜浓度的赤霉素可有效缓解盐胁迫对小麦种子萌发的抑制作用，本实验中缓解盐胁迫的最佳赤霉素浓度为0.25 g/L。