Relationships between lipid peroxidation and anoxia tolerance in a range of species during post-anoxic reaeration

Peroxidation was studied in anoxically treated plant tissues and quantified as conjugated dienes/trienes in the total lipid fraction and as the production of thiobarbituric acid reactive substances (TBARS), Oxidative stress caused by re-exposure of plants to oxygen led to an increase of conjugated diene/ triene formation in rhizomes of Iris germanica and roots of wheat (Triticum aestivum L,) and oats (Avena sativa L,), and after a long anoxic exposure (45 days) in the rhizomes of the, very anoxia tolerant Iris pseudacorus. Second derivative (SD) spectrophotometry of the UV spectrum of lipid extracts confirmed the formation of dienes, However, determination of TBARS in Iris spp, showed no lipid peroxidation in the anoxia tolerant I. pseudacorus. In the rhizomes of the anoxia intolerant I, germanica, elevated levels of TEARS correlated positively with conjugated diene/triene formation. The results suggest that anoxic stress may induce qualitative changes in membrane lipids, as indicated by lipid peroxidation after restoration of aerobic conditions. The rate of lipid peroxidation correlated negatively with anoxic stress tolerance.