Trehalose synthesis in mycorrhiza of Norway spruce: an indicator of vitality

Abstract

Exeised mycorrhizae of spruce trees, grouped according to state of development and integrity, were tested for their ability to produce fungal and plant specific, soluble carbohydrates from glucose. Trehalose was the principal sugar formed. A strong correlation was found^ between the rate of trehalose synthesis and the proportion of intact, turgid, young and vigorous appearing mycorrhizae.

Seasonal changes of soluble carbohydrates in mycorrhizas of Norway spruce and changes induced by exposure to frost and desiccation

“…It has been shown in a previous publication (NIEDERER et al 1989) that incubation with these sugars induces accumulation of trehalose and mannitol to various degrees whereas incubation in water leeds to a decrease in the amount of soluble carbohydrates in the mycorrhizas. To obtain different carbohydrate contents they were incubated over night (14h) at 27°C in an aerated solution (5 ml) of either 28 mM glucose, 28 mM fructose or deionized water.…”

Flow discharge influences on input and transport of particulate and sedimentary organic carbon along a small temperate river

“…2a). Glucose, fructose and sucrose are commonly found at high levels in vascular plants (Pigman and Horton, 1970;Mopper, 1973); whereas mycose is a known fungal metabolite (Niederer et al, 1989). These sugar biomarkers (particularly glucose) are predominant but not exclusive of those sources, occurring in various other organisms (Elbein, 1974;Cowie and Hedges, 1984).…”

Sugars as source indicators of biogenic organic carbon in aerosols collected above the Howland Experimental Forest, Maine

“…CO 2 fixed in leaves moves into the phloem of trees primarily as the disaccharide sucrose (glucose + fructose) and reaches the root cells in this form (Martin et al, 1988). However, in symbiotic fungal tissues (mycorrhizal fungi), sucrose is replaced by mycose (glucose + glucose) as the most common disaccharide (Martin et al, 1988;Niederer et al, 1989). Mycose is present in a large variety of microorganisms (fungi, bacteria, yeast), a few higher plants and invertebrates (Elbein, 1974) where it can serve as a reserve carbohydrate and a stress protectant (Crowe et al, 1984;Wiemken, 1990).…”