摘要
用聚乙二醇-6000(PEG-6000)在室内模拟干旱条件,对1年生柚木苗进行渗透胁迫.在不同胁迫程度下,游离脯氨酸、可溶性糖、超氧化物岐化酶(SOD)、过氧化物酶(POD)的表现出明显变化:各处理脯氨酸与可溶性糖含量均随胁迫进程表现“低—高”的变化趋势,且以20%的PEG浓度处理增加最明显;活性氧清除酶(SOD、POD)活性随胁迫进程则表现出“低—高—低”的变化趋势.轻度胁迫随胁迫的进行2种酶活性上升缓慢;而重度胁迫虽上升较快,但下降也极快.由此说明,柚木在干旱胁迫下通过增加渗透调解物质含量,降低水势,加强保水力来提高其抗旱能力;并通过增强抗氧化酶活性,提高抗氧化能力,可减轻干旱胁迫伤害.
The seedlings of Tectona grandis were treated with polyethylene glycol 6000 （PEG-6000） at different concentration under drought stress. The results indicated that the contents of free proline and soluble sugars increased significantly with increasing of dealing time. The treatment of 20% PEG-6000 was the most effective. The activities of POD and SOD firstly increased and then decreased. The activities of POD and SOD increased slowly under the treatment of low concentration, but increased and decreased rapidly under strong osmotic stress. These indices showed that T. grand/s had an ability to adapt drought stress to some extents by adjusting osmotic substance, and improved antioxygenie ability to reduce damage from drought stress by improving protective enzymes activity.
出处
《福建林学院学报》
CSCD
北大核心
2006年第2期103-106,共4页
Journal of Fujian College of Forestry
基金
福建省科技厅重点基金资助项目(2001Z056)
关键词
柚木
PEG胁迫
生理指标
Tectona grandis
PEG stress
physiological indices
