THE SULFITOLYSIS OF THIOREDOXINS - A KEY REACTION FOR THE PHYTOTOXIC ACTION OF SULFUR-DIOXIDE IN PLANTS

被引：6

作者：

HABERLEIN, I

FOLLMANN, H

机构：

[1] Fachbereich Biologie-Chemie der Universität, Kassel

来源：

NATURWISSENSCHAFTEN | 1991年 / 78卷 / 06期

关键词：

D O I：

10.1007/BF01134352

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ample evidence exists that the phytotoxic action of sulfur dioxide in plants is initiated and propagated by impairment of their thioredoxin systems, which by their redox status control the light-dark regulation and productivity of chloroplast metabolism. We have shown that oxidized thioredoxin reacts readily with sulfite ions under sulfitolysis of its exposed disulfide bond and formation of an inactive S-sulfonyl thioredoxin. Accumulation of such modified proteins is suggested to mark the specific threshold concentration of SO2 toxicity in a plant. The adverse effects are potentiated intracellularly by an induction of excess H2O2 synthesis which will oxidize additional SH groups and make them susceptible to further sulfitolysis and incapacitation.

引用

页码：259 / 265

页数：7

共 58 条

[1] LIGHT AND THE MAINTENANCE OF PHOTOSYNTHETIC COMPETENCE IN LEAVES OF POPULUS-BALSAMIFERA L DURING SHORT-TERM EXPOSURES TO HIGH-CONCENTRATIONS OF SULFUR-DIOXIDE [J].