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Effects of nitrogen oxides on nitrate assimilation in bryophytes
Author(s) -
MORGAN S. M.,
LEE J. A.,
ASHENDEN T. W.
Publication year - 1992
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1992.tb01061.x
Subject(s) - nitrate reductase , nitrogen assimilation , nitrate , assimilation (phonology) , photosynthesis , fumigation , nitrogen , environmental chemistry , chemistry , botany , nitrogen cycle , horticulture , biology , philosophy , linguistics , organic chemistry
summary Nitrate assimilation and photosynthetic responses of Ctentdium mulluscum (Hedw.) Mitt. Homalothecium sericeum (Hedw.) Br.Eur. Pleurusium schreberi (Brid.) Mitt. Hylocomium splendens (Hedw.) Br.Eur. were studied during and after controlled exposures to 35 nl 1 −1 NO 2 and 35 nl 1 −1 NO. NO 2 induced nitrate reductase activity in all species 24 hours after the start of fumigation. The magnitude of the inductions varied between 23 and 89%. In contrast, exposure to NO caused a rapid decline in activity within 24 hours. After 21 days continuous exposure to each of the gases, the plants were supplied with a single application of 10 mM, NaNO 3 . Nitrate reductase activity was induced only in plants exposed to clean air. NO 8 exposure caused a loss of nitrate inducibility of NR. There were no marked effects on rates of oxygen evolution. After a three‐week pollution‐free period, the bryophytes regained the capacity for nitrate assimilation.