干旱胁迫下多效唑对羊柴生长特性调控效应研究

Effect of Paclobutrazol on Growth Characteristics of Hedysarum mongolicum Under Drought Stress

以内蒙古鄂尔多斯市乌审旗1年生羊柴幼苗为试验材料,研究重度干旱胁迫下不同浓度多效唑对羊柴地上部分生长特性和根系特性的影响。结果表明:重度干旱胁迫下,150~600 mg/L浓度的多效唑能抑制羊柴幼苗株高的生长,促进分蘖及基径增粗,150 mg/L多效唑处理下羊柴根系长度、根系体积及根系表面积均较对照(CK)低,300 mg/L浓度以上的多效唑则会促进羊柴根系的生长;在提高根系长度上,多效唑对细根的作用效果优于小根和中根;经相关分析和隶属函数分析发现,重度干旱条件下,多效唑处理后羊柴地上部分与根系生长状况关系不明显,根系特性间关系较密切,450 mg/L的多效唑对羊柴抗旱性的提高效果最佳。

Taken annual seedlings of Hedysarum mongolicum in Uxin Banner of Erdos as study material. The effect of different concentrations of paclobutrazol on the characteristics of aboveground growth and root of H. mongolicum was investigated under the severe drought condition. The results showed that plant growth was inhibited, while the branch diameter and tillering were enhanced at the paclobutrazol concentration changing from 150 mg/L to 600 mg/L under the severe drought condition. The root length, root volume and root superficial area were smaller than CK at the concentration of 150 mg/L, the root characteristics was promoted at the concentration above 300 mg/L. In the aspect of improving root length, radicel was most sensitive to paclobutrazol. Through correlation analysis and membership function analysis, the correlation between aboveground growth and root was not obvious, but the correlation among root characteristics was close. Paclobutrazol with a concentration of 450 mg/L has the best effect on improving drought resistance for H. mongolicum.