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Phytase activity in lichens

Higgins, Niall F.; Crittenden, P.D.

Authors

Niall F. Higgins niall.f.higgins@gmail.com

P.D. Crittenden peter.crittenden@nottingham.ac.uk



Abstract

Phytase activity was investigated in 13 lichen species using a novel assay method. The work tested the hypothesis that phytase is a component of the suite of surface-bound lichen enzymes that hydrolyse simple organic forms of phosphorus (P) and nitrogen (N) deposited onto the thallus surface.
Hydrolysis of inositol hexaphosphate (InsP6, the substrate for phytase) and appearance of lower-order inositol phosphates (InsP5–InsP1), the hydrolysis products, were measured by ion chromatography. Phytase activity in Evernia prunastri was compared among locations with contrasting rates of N deposition.
Phytase activity was readily measurable in epiphytic lichens (e.g. 11.3 lmol InsP6 hydrolysed g-1 h-1 in Bryoria fuscescens) but low in two terricolous species tested (Cladonia portentosa and Peltigera membranacea). Phytase and phosphomonoesterase activities were positively correlated amongst species. In E. prunastri both enzyme activities were promoted by N enrichment and phytase activity was readily released into thallus washings. InsP6 was not detected in tree canopy throughfall but was present in pollen leachate.
Capacity to hydrolyse InsP6 appears widespread amongst lichens potentially promoting P capture from atmospheric deposits and plant leachates, and P cycling in forest canopies. The enzyme assay used here might find wider application in studies on plant root–fungal–soil systems.

Journal Article Type Article
Journal New Phytologist
Print ISSN 0028-646X
Electronic ISSN 1469-8137
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 208
Issue 2
APA6 Citation Higgins, N. F., & Crittenden, P. (in press). Phytase activity in lichens. New Phytologist, 208(2), https://doi.org/10.1111/nph.13454
DOI https://doi.org/10.1111/nph.13454
Keywords enzymes, epiphytes, Evernia prunastri, inositol hexaphosphate, phosphomonoesterase, phytic acid
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/nph.13454/abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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