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The occurrence and amount of soluble and insoluble phenolics in mycorrhizal and non-mycorrhizal roots of Picea abies (L.) Karst, were investigated, p-Hydroxybenzoic acid glucoside, picein, piceatannol and its glucoside, isorhapontin, catechin and ferulic acid could be identified by high-performance liquid chromatography in mycorrhizas of Picea abies-Lactarius deterrimus and Picea abies-Laccaria amethystea. Both types were collected from axenic cultures and the latter also from a spruce stand. The same phenolics occurred in non-mycorrhizal short roots from sterile cultures. However, the amounts of p-hydroxybenzoic acid glucoside, picein, catechin and cell wall-bound ferulic acid were considerably reduced in mycorrhizas from axenic culture, whereas the hydroxystilbenes piceatannol, its glucoside and worhapontin were not significantly reduced. Pure mycelia of Laccaria amethystea (Bull.) Murr, and Lactarius deterrimus Gröger were also analysed for phenolic compounds. Both fungal species contained none of the identified phenolics. The results are discussed with respect to mycorrhization in different mycorrhizal types.

Insoluble phenolics have been isolated and identified from Norway spruce (Picea abies [L.] KARST.) needles as cell wall-bound astragalin (kaempferol 3-O-β-glucoside) and p-coumaric acid as major components, and ferulic acid as a minor one. They probably mainly occur as lignincarbohydrate complexes

(14)C-Labelled CO2 fed to young Norway spruce (Picea abies [L.] Karst.) twigs was rapidly incorporated into kaempferol 3-O-glucoside (astragalin) of the needles. The patterns of the time course of total (per needle weight) and specific radioactivity (per amount of compound) of soluble and insoluble (cell wall-bound) astragalin indicate its transport from a soluble pool within the protoplast to an extraprotoplastic cell wall-bound pool within the needle. This conclusion is supported by measurements of the distribution of radioactivity between the aglycone (kaempferol) and the sugar part (glucose) of the molecule after various chase periods as well as by control experiments to determine the localization of [(14)C]astragalin in the cell wall preparations.