长期土壤干旱对豫麦54扬花期生理特性的影响

Effect of Long-term Soil Drought on Physiological Characteristics of Yumai 54 during Flowering Stage

为揭示豫麦54扬花期对长期干旱胁迫的生理响应机制,采用盆栽试验对不同土壤干旱条件下豫麦54扬花期生理特性进行了研究。结果表明,长期干旱胁迫下,豫麦54扬花期叶水势、叶相对含水率、根系活力和根系可溶性糖含量均随土壤水分的减少而显著降低;叶饱和亏、叶片可溶性糖和脯氨酸含量、质膜透性、SOD和POD活性及根系脯氨酸含量均显著增加。这说明,在长期干旱胁迫下,豫麦54通过降低叶片相对含水率、根系活力,增加叶片渗透调节物质可溶性糖和脯氨酸含量、根系脯氨酸含量,增强SOD和POD活性等生理上的变化以提高抗旱性,从而使其适应长期干旱胁迫造成的伤害。

This paper studied the physiological characteristics of Yumai 54 during flowering stage under different long-term soil drought.The results showed that leaf water potential,RWC,root activity and soluble sugar content of root decreased with soil moisture decreasing,and leaf WSD,soluble sugar content,proline content,the permeability of plasma membrane,the activities of SOD and POD in leaf and root praline content increased with soil water decreasing.In conclusion,Yumai 54 increased drought-resistance by physiological changes,such as water potential,RWC,root activity and transpiration rate reduced,soluble sugar content and proline content increased,and POD activity enhanced,etc.On the basis of above physiological changes,Yumai 54 could adapt to long-term soil drought during flowering stage.