盐胁迫下超级稻新品种‘松粳15’发芽特性分析

Germination Characteristics of New Super Rice Variety‘Songjing 15'Under Salt Stress

为了探讨超级稻新品种‘松粳15’在盐胁迫条件下的种子发芽特性,采用Na Cl单盐胁迫,设置50、100、150、200 mmol/L 4个浓度梯度进行人工气候箱培养,调查分析了发芽势、发芽率、苗长、根长、主根数、苗鲜重、根鲜重、苗干重、根干重等发芽指标。结果表明:盐胁迫导致‘松粳15’发芽势、发芽率、发芽指数和活力指数下降,并且随着盐浓度的升高逐渐降低,苗长和主根数受到抑制,根长随着盐浓度增加呈先增后降的趋势,苗鲜重和苗干重低于对照,根鲜重和根干重高于对照,通过对盐浓度与发芽特性指标相关分析,盐浓度与根鲜重、根干重极显著正相关,与苗长、主根数、苗干重、发芽势、发芽率呈极显著负相关。

In order to analyze germination characteristics of new super rice variety‘Songjing 15＇under saltstress, a Na Cl stress experiment was conducted with 4 concentrations as 50, 100, 150 and 200 mmol/L inmanual climatic box, the indexes including germination vigor, germination rate, seedling length, root length,main root number, seedling fresh weight, root fresh weight, seedling dry weight, root dry weight wereinvestigated. The results showed that salt stress could lead to the reduction of germination vigor, germinationrate, germination index and vigor index of‘Songjing 15＇, and these indexes gradually decreased with theincrease of salt concentration. The seedling length and main root number were inhibited under salt stress, andthe root length increased and then decreased with salt concentration increase. Under salt stress, seedling freshweight and seedling dry weight were lower than that of control, and root fresh weight and root dry weight werehigher than that of control. The correlation analysis of salt concentration and germination characteristic indexesshowed that salt concentration was significantly and positively correlated with root fresh weight and root dryweight, and significantly and negatively correlated with seedling length, main root number, seedling dry weight,germination vigor and germination rate.