期刊
NEW PHYTOLOGIST
卷 152, 期 2, 页码 333-341出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.0028-646X.2001.00256.x
关键词
bryophytes; lichens; superoxide; oxidative burst; desiccation
. The mechanism of extracellular superoxide radical (O-2(.-),) formation and the role of the oxidative burst in response to desiccation stress is reported here in bryophytes and lichens from habitats of contrasting water availability. . . Rates of extracellular production of O-2(.-) radicals were measured, before and after desiccation stress, by the oxidation of epinephrine to adrenochrome, determined spectrophotometrically. . Several desiccation-sensitive lichens and bryophytes that grow in very wet microhabitats produced O-2(.-) extracellularly at high rates, even when they were not stressed. In addition, some species showed a powerful burst of O-2(.-) production during rehydration following desiccation. Production of high levels of O-2(.-) and the existence of an inducible oxidative burst was best developed in cyanobacterial lichens, a hornwort and the two thalloid liverworts tested. Extracellular production of O-2(.-) was almost absent from all mosses tested, a leafy liverwort, a filmy fern and from desiccation-tolerant lichens. . Patterns of O-2(.-) production are discussed in terms of their possible role as a defence against pathogenic fungi and bacteria.
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