Polyphenol control of nitrogen release from pine litter

Northup, Robert R.; Yu, Zhiwei; Dahlgren, Randy A.; Vogt, Kristina

doi:10.1038/377227a0

Cited by 551 publications

(386 citation statements)

References 26 publications

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“…The effectiveness of N uptake at the sites of mineralization probably prevents the leakage of N from the forest ecosystem. However, the data from Northup et al (1995) indicate that a short-circuit in the N cycle might be plausible in forest communities on extremely acidic, infertile soils.…”

Section: Discussionmentioning

confidence: 99%

A comparison of the extracellular enzyme activities of two ectomycorrhizal and a leaf‐saprotrophic basidiomycete colonizing beech leaf litter

1996

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summary Activities of extracellular enzymes were determined in beech (Fagus sylvatica L.) leaf litter colonized by the litter decomposer Lepista nuda (Bull.: Fr.) Cooke or by vegetative mycelium from the mycorrhizal fungi Thelephora terrestris Ehrh.: Fr. or Suillus bovinus (L.: Fr.) O. Kuntze. Organic matter (OM) was buried for up to 6 months in plant containers in which mycorrhizal or non‐mycorrhizal Pinus sylvestris L. seedlings were cultivated at a low rate of nutrient addition. After different periods of colonization the activities of phosphomonoesterase and protease, two enzymes involved in nitrogen and phosphorus mobilization, were determined in colonized and uncolonized litter. The activities of cellulase, β‐xylosidase, β‐glucosidase and polyphenol oxidase were investigated as indicators of the decomposition capacity of the fungi in the litter. Low activities of all enzymes tested were found in the uncolonized beech leaves. Phosphomonoesterase activity was high in litter colonized with L. nuda or S. bovinus, and was intermediate in the T. terrestris treatment. For all other enzymes the activities in the OM inoculated with the white‐rot litter decomposer were considerably larger than those detected in litter colonized by ectomycorrhizal basidiomycetes. Cellulase activity was low in the control as well as in the mycorrhizal treatments. β‐Xylosidase and β‐glucosidase were detected in the litter with mycorrhizal mycelium, whereas polyphenol oxidase activity was only clearly increased in the S. bovinus treatment. These results demonstrate the low lignocellulase activity of both mycorrhizal fungi. This feature reduces the capacity of the mycorrhizal fungi to exploit fresh beech leaf litter, whose endogenous nitrogen is associated with or shielded by refractory compounds. The results are discussed in relation to the role of ectomycorrhizal fungi in nutrient cycling processes m temperate forest ecosystems.

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Section: Discussionmentioning

confidence: 99%

A comparison of the extracellular enzyme activities of two ectomycorrhizal and a leaf‐saprotrophic basidiomycete colonizing beech leaf litter

1996

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“…Northup et al (1995) suggested that polyphenols such as tannins may play a role in the control of nitrogen dynamics in soils. The unique ablility of black aspergilli to utilize high concentrations of tannic acid sets them apart from all related fungi.…”

Section: Discussionmentioning

confidence: 99%

“…Both types of tannins occur in plant materials, both consist of a large range of molecules with different complexity, and both are capable of forming complexes with proteins, 'the tannin-effect ' (Goldstein & Swain 1965). Tanninprotein complexes are difficult to mineralise, and thus are determinants of the proportion of nitrogen released in dissolved organic forms relative to the NH 4 + and NO 3 x mineral forms (Northup et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Efficient degradation of tannic acid by black Aspergillus species

Diepeningen

Debets

Varga

et al. 2004

Mycological Research

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“…As a result, peak productivity coincides with a relatively 'balanced' supply of inorganic and organic N, potentially generating a greater opportunity for N partitioning. As retrogression proceeds, more of the total soil N pool occurs in less available organic forms (e.g., protein-tannin complexes), N mineralization rates decrease strongly, and a larger proportion of N is supplied as amino acids [23,24]. Partitioning of organic N would still be possible where the majority of the soluble N supply is in the form of amino acids, given that plant species can show preferences for specific amino acids or peptides [18].…”

Section: Box 2 Pedogenic Changes Along Long-term Soil Chronosequencesmentioning

confidence: 99%