PuSH - Publication Server of Helmholtz Zentrum München: Biochemical response of Norway spruce (<em>Picea abies </em>(L.) Karst.) towards 14-month exposure to ozone and acid mist: Part I - effects on polyphenol and monoterpene metabolism.

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Heller, W.E. ; Rosemann, D. ; Oßwald, W.F. ; Benz, B. ; Schönwitz, R. ; Lohwasser, K. ; Kloos, M. ; Sandermann, H.J.

Biochemical response of Norway spruce (Picea abies (L.) Karst.) towards 14-month exposure to ozone and acid mist: Part I - effects on polyphenol and monoterpene metabolism.

Environ. Pollut. 64, 353-366 (1990)

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Three-year-old clonal Picea abies (L.) Karst. plants, grown either on a sandy (No. 1) or on a calcareous (No. 2) soil, were treated with ozone (100 μg m-3 and peaks of up to 360 μg m-3) and acid mist (pH 3.0) over two vegetation periods. Needles of the current (1987) and previous (1986) year were analysed at the end of the experiment for biosynthetic enzymes and in vivo activity of the phenylpropanoid pathway, for products of polyphenol metabolism (clones 11 and 14), and for mono- and sesquiterpenes (clones 14 and 16). 1. Polyphenol metabolism. The activity of cinnamyl alcohol dehydrogenase, an enzyme of the lignin pathway, was increased by the treatment by up to 83% in the needles of both age classes. Chalcone synthase was measured in mature tree material for the first time. This enzyme, as well as phenylalanine ammonia-lyase activities and the content of catechin, astringin, isorhapontin, picein and p-hydroxyacetophenone, exhibited no significant treatment-dependent differences. However, soil and age-class dependent differences occurred. Pulse-labelling experiments with L[U-14 C]phenylalanine and [2-14 C]acetate were carried out at four different stages of shoot development and showed label incorporation into (+)-catechin and proanthocyanidins. There was no effect of the ozone and acid mist treatment. 2. Monoterpenes. The content of needle terpenes was generally diminished by the ozone and acid mist treatment. Other factors tested, such as clone, needle age and soil, exerted a highly significant influence on the content of most of the needle monoterpenes.

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