0000000000462553
AUTHOR
G. M. Rothe
Effect of season and soil treatments on carbohydrate concentrations in Norway spruce (Picea abies) mycorrhizae
We studied effects of season and soil treatments (watering, acidification, liming and combinations of these treatments) on soluble carbohydrates of mycorrhizal roots of Norway spruce (Picea abies (L.) Karst.). Arabinose, arabitol, fructose, glucose, inositol, lactose, mannitol, pinite, quinate, raffinose, shikimate, stachyose and trehalose were identified by HPLC. Concentrations of inositol, lactose and pinite were constant throughout the year, whereas concentrations of raffinose, stachyose and trehalose were higher in winter than in summer, and concentrations of glucose, fructose and mannitol increased from February to September. Soil acidification and liming had no effect on the annual me…
Evidence for an intra- and extraplastidic pre-chorismate pathway.
Pea plants grown under different conditions of cultivation, and eight different plant species with variegated leaves were used to study the intracellular localization of shikimate oxidoreductase (EC 1.1.1.25), the marker enzyme of the pre-chorismate pathway. The two series of experiments indicated an intra-and an extraplastidic compartimentalization of the enzyme, and both enzyme activities are regulated differentially. While the extraplastidic activity is permanently demonstrable, the intraplastidic activity is subject to the plants' developmental state and also depends on both illumination and fertilization.
Die Wirkung von Säure und Aluminiumionen auf den Nährelementgehalt und den histologischen Zustand nichtmykorrhizierter Fichtenwurzeln (Picea abies [L.] Karst.)
Dreijahrige Fichten wurden 2 Jahre lang in einer Spruhhydrokultur gehalten und anschliesend 6 Monate lang mit Nahrlosungen behandelt, die den Lysimeterlosungen unter Fichte im Solling entsprachen, wobei die pH-Werte auf 5.0, 3.5 und 2.5 eingestellt wurden. Ein Teil der Nahrlosungen mit pH 3.5 bzw. 2.5 wurde mit 1 oder 2 mmol Aluminium pro Liter angereichert. Die Ca- und Mg-Werte der Nadeln und Wurzeln sanken unter Saure- und Aluminiumseres nicht unter die Mangelgrenzen, auch wenn die Gehalte beider Elemente um bis zu 35% abnahmen. Weitere Veranderungen wurden fur Kalium, Phosphor und Aluminium beobachtet.