摘要
运用开顶式气室(OTC-1)研究了O3胁迫对原位条件下冬小麦叶片的光合色素、脂质过氧化和抗氧化系统的影响.结果表明:随着O3浓度的升高,各个生育期小麦叶片中叶绿素含量下降,叶绿素组成发生改变,且在灌浆期变化明显;叶片相对电导率(REC)增大,丙二醛(M DA)含量增加;过氧化氢酶(CAT)、过氧化物酶(POD)活性和类胡萝卜素(C ar)含量降低,超氧化物歧化酶(SOD)活性在O3浓度低于1×10-7(φO3)时逐渐升高,而后急剧降低.可见O3促进了小麦叶片老化,加剧了膜脂过氧化,破坏了抗氧化系统功能,影响了叶片的正常生理代谢.
Effects of ozone on chlorophyll content and Lipid peroxidation and anti-oxidation system in the in situ leaves of winter wheat in an open-top chamber （OTC-1）. The results revealed that as the ozone concentration increased,the leaves of wheat increased their chlorophyll contents and changed their chlorophyll composition in various stages of wheat growth and this appeared remarkable at the seed-filling stage;the relative electric conductivity and MDA content of the leaves increased and the CAT and POD activities and the carotinoid content declined;the SOD activity increased where the ozone concentration was below 1×10^7（ψO3） and sharply declined where the ozone concentration rose above 1 ×10^7（ψO3）. Accordingly,it can be seen that ozone promotes wheat leaves to age,intensify the damage to their membrane lipid,and imparir the function of their anti-oxidation system,in such a way exerting influence on their regular physiological metabolism.
出处
《西北植物学报》
CAS
CSCD
北大核心
2005年第11期2240-2244,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划(2002CB410803)
关键词
臭氧
冬小麦
膜脂过氧化
抗氧化系统
ozone
winter wheat
membrane lipid peroxidation
anti-oxidation system
