摘要
受盐胁迫的葛仙米其光系统II(PSII)反应中心的激发捕获效率(Fv/Fm)随着盐度的升高而降低,盐度高时.藻体Fv/Fm随处理时间延长而迅速下降.外源脯氨酸对Fv/Fm由于盐胁迫而降低的缓解作用并不十分明显,内源脯氨酸含量并不因为盐度的上升而增加.受胁迫藻体的膜脂过氧化产物丙二醒则由于胁迫加重而上升.另外,随着外界盐度的上升,葛仙米SOD的活性却呈现出典型的“V”形变化,这可能与藻体在不同盐度时所承受的实际胁迫有关.
In the colonies of Nostoc sphaeroides kutz. which suffered salt stress, the efficiency of excitation capture by open photosystem II (PSII) reaction centers (expressed as Fv/Fm) decreased with increased salinity. When treated with high salinities, the algal colonies lowered the Fv/Fm after prolonged treatment. The exogenous proline had little function in preventing the lowering of Fv/Fm on the salt stressed colonies. Meanwhile, the endogenous proline contents of the colonies didn' t increase with the increased salinities, whereas malondialdehyde (MDA) increased when the salt stress became more serious. In addition, the graphes of the SOD activities in the colonies have a typical 'V' shape with treating salinities, presumably the changing was related to the real stresses that the colonies experienced .
出处
《水生生物学报》
CAS
CSCD
北大核心
1999年第5期414-419,共6页
Acta Hydrobiologica Sinica
基金
国家自然科学基金!39670071
中国科学院重点项目!k-952-J1-104
关键词
葛仙米
叶绿素荧光盐胁迫
FV/FM
丙二醛
脯氨酸
过氧化物歧化酶
Nostoc sphaeroides Kutz, Salt stress, Chlorophyll fluorescence Fv/Fm, Malondialdehyde, Proline, Superoxide dismutase.