水杨酸浸种对甜玉米种子萌发及生理特性的影响

Effects of Salicylic Acid Pretreatment on the Seeds Germination and Physiological Characteristics of Sweet Corn

用不同浓度(0.25、0.5、0.75、1.0、1.25、1.5 mmol/L)的水杨酸(SA)溶液浸泡处理甜玉米种子进行发芽试验,统计种子萌发情况,分析幼苗相关生理指标的变化。结果表明,较低浓度的水杨酸溶液(0.25～0.75 mmol/L)处理有利于甜玉米种子的萌发,能有效提高种子发芽率、发芽势及发芽指数,提高可溶性糖和脯氨酸含量,增强幼苗中过氧化物酶(POD)活性,降低淀粉酶活性;较高浓度的水杨酸溶液(1.25～1.5 mmol/L)抑制甜玉米的萌发,与对照相比降低幼苗可溶性糖含量,增强淀粉酶活性,1.5 mmol/L水杨酸溶液处理降低POD活性及脯氨酸含量。综合各指标,在生产中建议使用0.25～0.75 mmol/L水杨酸溶液处理种子,可促进种子萌发,调节酶活性,提高植物对逆境的抗性。

The sweet corn seeds were treated with different concentration solution（0.25,0.5,0.75,1.0,1.25,1.5 mmol/L） of salicylic acid（SA）,and seed germination experiments were tested.Some of physiological characters of sweet corn seedling were measured after treatment.The results showed that a low concentration of salicylic acid solution（0.25-0.75 mmol/L） could promote seed germination and enhance POD activity,increase soluble sugar and proline content,and reduce amylase activity of sweet corn.But higher levels concentration of salicylic acid solution（1.25-1.5 mmol/L） could suppress seeds germination rate of sweet corn,the POD activity decreased,amylase activity enhanced,proline and soluble sugar content are reduced.