摘要： 植物细胞壁在遭遇逆境后会出现增厚现象，以抵御不良环境。有研究认为这是由于细胞壁内的木质素沉积形成的。目前认为木质素的合成途径不只一条，但苯丙氨酸解氨酶(PAL)和肉桂酸4-羟基化酶(C₄H)等酶在合成中起到了十分重要的作用。因此，本试验以野生蒙古扁桃为试验材料，研究干旱胁迫对其在不同生态环境条件下体内PAL和C₄H酶活性影响的变化。结果表明：在遭受干旱胁迫时，蒙古扁桃叶内PAL和C₄H活性随干旱胁迫程度的增加而逐渐增强，且干旱地区的蒙古扁桃叶内PAL和C₄H活性要强于相对不干旱地区。PAL和C₄H活性与植物的抗旱性呈正相关关系。

关键词: 蒙古扁桃, 干旱胁迫, PAL, C₄H, 木质素

Abstract: Plant cell wall in the face of adversity will appear thicker,to withstand the adverse environment.It was a preliminary identification of the cell wall due to the formation of the lignin deposition.At present,the synthesis of lignin that is not only a means,but Phenylalanine Ammonia-Lyase (PAL) and Cinnamic acid 4-Hydroxylase (C₄H),such as enzyme in the synthesis played a very important role.As a result,this experiment with wild Prunus mongolia Maxim used to study drought stress in different ecological conditions,the impact of the body of its PAL and C₄H activity.The results showed that:when subjected to drought stress,Prunus mongolia Maxim almond leaves with the activity of PAL and C₄H drought stress increased gradually increased,and in arid regions in Prunus mongolia Maxim almond leaf PAL and C₄H activity than the relatively arid region.PAL and C₄H activity and plant drought resistance was positive correlation between.

Key words: Prunus mongolia Maxim, Drought stress, PAL, C₄H, Lignin

中图分类号: 

• S662.9