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1996 (1)
1994 (1)
1Author    ChristineM. Richter, Aloysius WildRequires cookie*
 Title    Phenolic Compounds in Needles of Norway Spruce Trees in Relation to Novel Forest Decline. II. Studies on Trees from Two Sites in Middle Western Germany  
 Abstract    The content of several phenolic compounds in needles of 20-to 30-year-old Norway spruce trees (Picea abies) was measured using HPLC. The results of two forestry sites in middle western Germany are reported in this paper. They are part of a research programme on novel forest decline which was carried out in various regions of Germany. Distinct amounts of picein, catechin, piceatannol glucoside, and other phenolic compounds were detected in the studied spruce needles. Additionally, their contents changed in relation to damage. Some compounds, especially catechin, showed increased levels in the needles of the damaged trees compared to the undamaged ones. Here, the values for the undamaged trees of the different sites were similar. Concerning the changes in picein contents, however, there was a great difference between the sites. p-Hydroxyacetophenone was detected in very low amounts only and did not correlate with damage. These results are compared with earlier findings from another site that shows severe dam­ age. The role of phenolic compounds as indicators of tree damage is discussed. 
  Reference    Z. Naturforsch. 49c, 619—627 (1994); received January 31/June 16 1994 
  Published    1994 
  Keywords    Phenolic Compounds, Picea abies, Novel Forest Decline, Picein, Catechin 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0619.pdf 
 Identifier    ZNC-1994-49c-0619 
 Volume    49 
2Author    C. Hristine, M. R. Ichter, U. Lrich Eis, A. Loysius WildRequires cookie*
 Title    Phenolic Compounds as a Tool of Bioindication for Novel Forest Decline at Numerous Spruce Tree Sites in Germany  
 Abstract    Within a project that applied biochemical criteria to the diagnosis of damage to Norway spruce, 43 sites in western and eastern Germany showing only moderate tree damage were screened for the amounts of methanol soluble phenolic compounds in spruce needles. The concentrations of most of the main compounds -especially catechin -positively correlated with needle loss and the altitude of the site. It was also found that it is necessary to differenti­ ate between trees younger and older than 60 years of age. The correlations between the increase of the phenolic compounds studied and the needle loss or the damage class are stronger in the younger trees, possibly implicating differences in metabolic state or distur­ bances in protectective mechanisms in the older trees. 
  Reference    Z. Naturforsch. 51c, 53—58 (1996); received September 20/0ctober 6 1995 
  Published    1996 
  Keywords    Phenolic Compounds, Catechin, Novel Forest Decline, Correlations, Picea abies 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0053.pdf 
 Identifier    ZNC-1996-51c-0053 
 Volume    51