盐胁迫对葛仙米生理生化特性的影响
THE EFFECT OF SALT STRESS ON SOME PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF NOSTOC SPHAEROIDES Kütz. (CYANOBACTERIUM)
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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醛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。Abstract: In the colonies of Nostoc sphaeroides kütz.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 .
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