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High Molecular Size Humic Substances Enhance Phenylpropanoid Metabolism in Maize (Zea mays L.)

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Abstract

A high molecular weight humic fraction (>3,500 Da) was characterized chemically by DRIFT and 1H NMR spectroscopy, and was applied to Zea mays L. plants to evaluate its effect on phenylpropanoid metabolism. The activity and gene expression of phenylalanine (tyrosine) ammonia-lyase (PAL/TAL), and the concentrations of phenolics and their amino acid precursors phenylalanine and tyrosine were assayed. Maximum induction of PAL/TAL activity and expression was obtained when the concentration of added humic substance was 1 mg C/l hydroponic solution. Phenylalanine and tyrosine significantly decreased (−16% and −22%, respectively), and phenolic compounds increased in treated plants. The effects of the humic substance could be ascribed partly to indoleacetic acid (27 nmol/mg C) in the humic fraction. Our results suggest that this humic fraction induces changes in phenylpropanoid metabolism. This is the first study that shows a relationship between humic substances and the phenylpropanoid pathway.

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Acknowledgements

This work was partially supported by a grant from the University of Padova (ex 60%, 2008) awarded to Prof. Serenella Nardi. We are grateful to Dr. Andrea Ertani and Dr. Sara Trevisan for their helpful assistance. The authors would like to thank Professor Ann E. Hagerman for her precious help in the improvement of the manuscript.

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Correspondence to Diego Pizzeghello.

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Schiavon, M., Pizzeghello, D., Muscolo, A. et al. High Molecular Size Humic Substances Enhance Phenylpropanoid Metabolism in Maize (Zea mays L.). J Chem Ecol 36, 662–669 (2010). https://doi.org/10.1007/s10886-010-9790-6

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  • DOI: https://doi.org/10.1007/s10886-010-9790-6

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