摘要
采用开顶式熏气装置 ,以浓度为 0 85 71mg·m-3 的SO2 对二三年生的油桐 (Verniciafordii)幼苗进行 118d熏气试验。结果表明长期低浓度SO2 熏气处理引起光化学猝灭、非光化学猝灭、表观光合电子传递速率 (ETR)下降 ,荧光产量 (Ft)增加 ,光系统Ⅱ (PSⅡ )的光能转换效率和潜在活性下降 ;光系统Ⅰ (PSⅠ )的潜在活性和光能转换效率也下降。因此认为 :长期低浓度SO2 熏气处理引起PSⅠ和PSⅡ结构破坏 ,导致光系统光能转换效率和系统潜在活性的下降。
Structure and function of the photosystem of tungoiltree(Vernicia fordii)saplings were determined after the saplings had been subjected to long-term(118 d)fumigation with low concentration(0.857 1 mg·m(-3))SO_2.The results show that the fumigation led to decrease in photochemical quenching,non-photochemical quenching and apparent photosynthetic electron transport rate(ETR),but to increase in fluorescence output.The results also show that the light conversion efficiency and potential activity of the photosystem Ⅱ(PSⅡ)and photosystem Ⅰ(PSⅠ)decreased with SO_2 fumigation.It can,therefore,be concluded that the long fumigation with low concentration SO_2 resulted in destruction of the structure of PSⅠ and PSⅡ,thus causing decrease in total light conservation efficiency and potential activity of the photosystem.
出处
《农村生态环境》
CSSCI
CSCD
北大核心
2004年第1期60-64,共5页
Rural Eco-Environment
基金
国家自然科学基金资助项目 ( 3 96 70 5 99)
关键词
SO2
光系统
功能
油桐
SO_2
photosystem
function
Vernicia fordii
