Generation of hydroxyl analogous radicals by Arthrobacter sp.

Blondeau, R

doi:10.1016/0378-1097(87)90250-3

Cited by 1 publication

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fungal laccase and plant peroxidase decolorized and dissolved humic extract in vitro (GRAMSS et al 1999). Humic substances are also degraded by bacteria such as Arthrobacter (BLONDEAU 1987) and several actinomycetes (KHANDELWAL and GAUR 1980), some of which disposed of periplasmic peroxidases (DARI et al 1995). In spite of the humic acid precipitating effect of the enormous Ca, K, and Mg concentrations in MR soil extract (Table 3), its content in soluble humic substances was the 3.7-fold of the control (Fig.…”

Section: Discussionmentioning

confidence: 92%

Factors influencing water solubility and plant availability of mineral compounds in the tripartite fairy rings ofMarasmius oreades(Bolt.: Fr.) Fr.

Gramss

Voigt

Bergmann

2005

J. Basic Microbiol.

View full text Add to dashboard Cite

Fairy rings of M. oreades on pasture land were denoted by the dark-green vegetation. Grasses and rooted soils were analyzed to determine the influence of nonsymbiotic fungal mats on plant uptake of (heavy) metals. In soil colonized by M. oreades, degradation of 20-35% of plant roots in the presence of fungal laccase increased the content of dissolved organic carbon (3.74x), hexose sugar (3.75x), NH(3)/NH(4) (+) (5.1x), NO(3) (-) (11.1x), the number of aerobic bacteria (14.4x), and the formation of the phytochelators, oxalic, citric, and malonic acids. Soil pH diminished by 1.5 units mainly due to nitrification and carboxylic acid production. Although the solubility of trace elements increased (6.1x), plant roots had the same trace metal content as control plants, whereas the shoot content in Al, Cr, Fe, Ni, and Ti decreased by more than 50% due to inhibited root-to-shoot transfer. It is concluded that M. oreades and its associated bacteria increase the solubility of soil minerals significantly, but make them, due to presumed particularities in their complexation, less plant available and less re-complexable for the translocation into the plant vascular system.

show abstract