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盐胁迫对葛仙米生理生化特性的影响 被引量:23

THE EFFECT OF SALT STRESS ON SOME PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF NOSTOC SPHAEROIDE 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.
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参考文献12

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二级参考文献2

  • 1陆宝树,蒋福兴.在盐渍环境下大米草中游离脯氨酸的积累[J]南京大学学报(自然科学版),1982(04).
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