PHOTOOXIDATIVE DAMAGE TO THE CYANOBACTERIUM SPIRULINA-PLATENSIS MEDIATED BY SINGLET OXYGEN

被引：24

作者：

SINGH, DP ^{[1
]}

SINGH, N ^{[1
]}

VERMA, K ^{[1
]}

机构：

[1] BARKATULLAH UNIV, DEPT MICROBIOL, BHOPAL 462026, INDIA

来源：

CURRENT MICROBIOLOGY | 1995年 / 31卷 / 01期

关键词：

D O I：

10.1007/BF00294633

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

Experiments on the specific growth rate, bleaching of pigments, O-2 evolution, lipid peroxidation, and loss of sulfhydryl (- SH) content in response to the varying light intensities (2-28 W/m(2)) suggested that photodamage to the Spirulina cells was maximum at or beyond the photosynthesis saturating light intensity (12 W/m(2)). However, photobleaching of the chlorophyll a was relatively higher than beta carotenoid. The results on the N,N-dimethyl-p-nitrosoaniline (RNO) bleaching in the presence of oxygen radical quenchers exhibited maximum effect of sodium azide and indicated about the generation of singlet oxygen. The chlorophyll a-sensitized production of singlet oxygen by a type II reaction cannot be ruled out because of maximum oxidative damage to the cells at or beyond the photosynthesis saturating light intensity, i.e., 12 W/m(2), when the availability of triplet chlorophyll is maximum.

引用

页码：44 / 48

页数：5

共 25 条

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