High rates of extracellular superoxide production by lichens in the suborder Peltigerineae correlate with indices of high metabolic activity

被引:37
作者
Beckett, RP
Minibayeva, FV
Vylegzhanina, NN
Tolpysheva, T
机构
[1] Univ KwaZulu Natal, Sch Bot & Zool, ZA-3209 Pietermaritzburg, Scottsville, South Africa
[2] Russian Acad Sci, Inst Biochem & Biophys, Kazan 420503, Russia
[3] Moscow MV Lomonosov State Univ, Fac Biol, Dept Mycol & Algol, Moscow 119899, Russia
关键词
desiccation; lichens; oxidative burst; superoxide;
D O I
10.1046/j.1365-3040.2003.01099.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Rates of extracellular superoxide radical (O-2(.-)) formation were measured in 34 species of lichens from different taxonomic groupings and contrasting habitats before and after desiccation stress. All 21 species from the suborder Peltigerineae produce O-2(.-) extracellularly at high rates, even when they are not stressed. In addition, some species show a burst of O-2(.-) production during rehydration following desiccation. Extracellular production of O-2(.-) is almost absent in the species from other lichen groups. In general, production of high levels of O-2(.-) and the existence of an inducible oxidative burst are best developed in species growing in wet microhabitats. Rates of O-2(.-) production are also positively correlated to previously published indices of lichen metabolic activity. Preliminary studies on the identity of the O-2(.-) producing enzymes suggest that they do not possess the classical characteristics of those suggested to produce reactive oxygen species in higher plants. Patterns of O-2(.-) production are discussed in terms of the strategies used by different lichens groups in their defence against pathogenic fungi and bacteria.
引用
收藏
页码:1827 / 1837
页数:11
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