水杨酸浸种对谷子萌发期抗旱性的影响

Effects of Soaking Seeds with Salicylic Acid on Drought Resistance of Millet at Germination Stage

为研究水杨酸对谷子萌发期抗干旱胁迫能力的影响,以衡谷15、衡谷13、冀谷19、衡饲1号谷子种子为材料,以18%的PEG模拟干旱环境,分别用7种浓度的水杨酸浸种24 h,测定发芽率、发芽指数、活力指数、根长、苗高、鲜重等,综合分析4种谷子的抗干旱胁迫能力。结果表明:在干旱胁迫下,水杨酸浸种后各品种表现不同,有些品种的抗旱能力没有明显变化。而冀谷19和衡谷15的发芽能力显著提高,衡谷15、冀谷19、衡谷13的活力指数显著增加,0.6 mmol/L水杨酸浸种是最适浓度。通过隶属函数的综合分析可知水杨酸浸种后4个品种谷子抗旱性的大小为:衡谷13>冀谷19>衡饲1号>衡谷15。

In order to study the effect of salicylic acid on drought resistance of foxtail millet during germination period, the seeds of Henggu 15, Henggu 13, Jigu 19 and Hengsi No.1 were soaked in salicylic acid for 24 h with 18%peg to simulate drought environment. The germination rate, germination index, vigor index, root length, seedling height and fresh weight of the four foxtail millet were determined. The results showed that under drought stress, all varieties showed different performance after soaking in salicylic acid, and the drought resistance of some varieties did not change significantly. The germination ability of Jigu 19 and Henggu 15 increased significantly, and the vigor index of Henggu 15, Jigu 19 and Henggu 13 increased significantly. 0.6 mmol/L salicylic acid was the optimal concentration for soaking seeds. According to the comprehensive analysis of membership function, the drought resistance of four millet varieties after soaking with salicylic acid was Henggu 13 > Jigu 19 > Hengsi No 1 > Henggu 15.