Extracellular polysaccharidases synthesized by the epiphytic lichen Evernia prunastri (L.) Ach.

Yagüe, Ernesto; Orus, M. I.; Estévez, M. P.

doi:10.1007/bf00402856

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…The secretion of laccases by the foliose Pseudocyphellaria aurata has been suggested to assist the attachment of lichens to their lignin-rich substrate (Laufer et al 2006). The production of b-1,4-glucanase and a polygalacturonase by Evernia prunastri supports the enzymatic decomposition of cellulose and of the pectin (rhamnogalacturonide fraction) of the primary cell walls of oak tissues (Yagu¨e et al 1984). The consequent hyphal inter-and intracellular penetration has been correlated to defoliation and vigor decrease of oaks induced by allelopathic processes (see the dedicated section below), while its influence on the nutritional lifestyle of lichens has not been investigated.…”

Section: To What Extent Do Corticolous Lichens Affect Plant Health?mentioning

confidence: 99%

Lichen-plant interactions

Favero‐Longo

Piervittori

2010

Journal of Plant Interactions

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Controversial data on the pathways and effects of lichen growth on and near bryophytes and vascular plants are reviewed. In most cases, plants which are used as growth substrates positively influence lichen mineral nutrition and are poorly affected by lichen overgrowth, but several reports of negative relationships, including lichen parasitism and allelopathic interferences, prevent generalizations. The allelopathy of terricolous lichens against neighboring plants has been suggested by in vitro investigations, and a multidirectional phytotoxic mode of action has been shown for lichen secondary metabolites. Recent researches on field settings, instead, offer little support of lichen allelopathy, and plant allelopathy against lichens has so far been neglected. A comparison with lichen-rock interactions indicates that a common set of physical and chemical factors can explain the heterogeneous reciprocal effects that exist between lichens and plants, which depend on the species involved, and highlights gaps that need further studies.

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Section: To What Extent Do Corticolous Lichens Affect Plant Health?mentioning

confidence: 99%

Lichen-plant interactions

Favero‐Longo

Piervittori

2010

Journal of Plant Interactions

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“…However, algal cells clearly represent a major source of 0-1,4-glucanase activity in the intact lichen. We previously suggested that the P-1,4-glucanase from E. prunastri might enable the fungal hyphae of this epiphyte to penetrate the cell walls of the supporting tree (Yague et al 1984). If this were the case, then a fungal location for the enzyme would be expected.…”

Section: Resultsmentioning

confidence: 99%

β-1,4-Glucanase (Cellulase) Location in the Symbionts of Evernia Prunastri

Yagüe

Estévez

1989

The Lichenologist

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“…The first is experimental. Both cellulases and polygalacturonases, which are active on pectins, have been detected in incubated whole lichens both in the presence 40,41 and absence 42 of cellulosecontaining algal photosymbionts. Cellulase production furthermore has been reported to vary depending on the species of tree it is growing on 43 .…”

Section: Discussionmentioning

confidence: 99%

Large differences in carbohydrate degradation and transport potential among lichen fungal symbionts

et al. 2022

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Lichen symbioses are thought to be stabilized by the transfer of fixed carbon from a photosynthesizing symbiont to a fungus. In other fungal symbioses, carbohydrate subsidies correlate with reductions in plant cell wall-degrading enzymes, but whether this is true of lichen fungal symbionts (LFSs) is unknown. Here, we predict genes encoding carbohydrate-active enzymes (CAZymes) and sugar transporters in 46 genomes from the Lecanoromycetes, the largest extant clade of LFSs. All LFSs possess a robust CAZyme arsenal including enzymes acting on cellulose and hemicellulose, confirmed by experimental assays. However, the number of genes and predicted functions of CAZymes vary widely, with some fungal symbionts possessing arsenals on par with well-known saprotrophic fungi. These results suggest that stable fungal association with a phototroph does not in itself result in fungal CAZyme loss, and lends support to long-standing hypotheses that some lichens may augment fixed CO2 with carbon from external sources.

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Extracellular polysaccharidases synthesized by the epiphytic lichen Evernia prunastri (L.) Ach.

Cited by 21 publications

References 11 publications

Lichen-plant interactions

Lichen-plant interactions

β-1,4-Glucanase (Cellulase) Location in the Symbionts of Evernia Prunastri

Large differences in carbohydrate degradation and transport potential among lichen fungal symbionts

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