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园艺学报 ›› 2007, Vol. 34 ›› Issue (3): 549-554.

• 果树 • 上一篇    下一篇

水分胁迫下湖北海棠根系线粒体及细胞死亡特性研究

马怀宇1;肖 静1;杨洪强1,2*   

  1. (1 山东农业大学园艺学院, 山东泰安271018; 2 作物生物学国家重点实验室, 山东泰安271018)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-06-25 发布日期:2007-06-25

Study on Root Mitochondrial Character istics and Root CellDeath o f Malus hupehensis Rehd. under Water Stress

MA Huai-yu1;XIAO Jing1;YANG Hong-qiang1,2*   

  1. (1College of Horticulture, Shandong Agricultural University, Taian, Shandong 271018, China; 2 State Key Laboratory of CropBiology, Taian, Shandong 271018, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-06-25 Published:2007-06-25

摘要: 用20% PEG6000处理湖北海棠(Malus hupehensis Rehd. ) 根系, 研究了水分胁迫条件下根系
线粒体膜电位(Δψm) 、线粒体H2O2含量、细胞程序性死亡关键酶类caspase23 /7活性的变化。结果显示,
在20% PEG6000处理前6 d, 根系线粒体Δψm缓慢降低, 第6天后急剧下降。线粒体H2O2含量在处理的第
1~6天里缓慢升高, 第6天后则快速上升。TUNEL原位检测显示, PEG6000处理能够使根系切片上出现清
晰的阳性反应斑点, 且随着处理时间的延长阳性反应斑点增多; 处理第3天和第6天, 根系中类caspase23 /
7活性较低, 而处理第9天和第12天时类caspase23 /7活性成倍升高, 这表明20% PEG6000能够诱导湖北海
棠根系细胞程序性死亡。

关键词: 湖北海棠, 根系, 水分胁迫, 线粒体, 细胞程序性死亡, Caspase

Abstract: The changes of rootmitochondrialmembrane potential (Δψm) , H2O2 concen
tration and the activity of caspase23 /7, the key enzyme of p rogrammed cell death were studied
under 20%-PEG6000 treatment. The results showed that root mitochondrial Δψm declined
slowly in the first six days of PEG treatment, then declined rap idly. The content of mitochon
drial H2O2 increased slowly in the first six days, then accumulated speedy inside of mitochon
dria. TUNEL assay was carried out and root paraffin slices disp layed distinct positive reaction
spots, which were more and more with the p rolonging treatment. The activity of caspase23 /7 in
root kep t at low level from the first day to the sixth day, and then rose sharp ly on the ninth and
twelfth day of PEG treatment. These indicate that 20% PEG6000 can induce p rogrammed cell
death inM alus hupehensis Rehd. roots at a certain treating2phase.

Key words: Malus hupehensis Rehd., Root, Water stress, Mitochondria, Programmedcell death, Caspase