NDLI: Roles of apoplastic peroxidases, laccases, and lignification in the manganese tolerance of hyperaccumulator Phytolacca americana

Content Provider	Springer Nature Link
Author	Gao, Lu Peng, Kejian Chen, Yahua Wang, Guiping Shen, Zhenguo
Copyright Year	2011
Abstract	We investigated the response of Mn-hyperaccumulator Phytolacca americana L. to manganese excess as well as the relationships between lignin deposition in the plant’s leaves, peroxidase and laccase activities in the leaf apoplast, and Mn toxicity. The exceptionally high tolerance of P. americana to Mn, both in solution and in tissue, was confirmed. No visible brown spot was observed in the leaves of plants treated with ≤10,000 μM Mn for 10 days. Mn treatment significantly increased lignin content and laccase activity in the apoplastic washing fluid (AWF) of P. americana leaves. In contrast, an increase in the Mn supply was paralleled by a significant decrease in the concentration of total phenolic compounds (TPCs) and in water-soluble guaiacol peroxidase (SPOD) activity in leaf AWF. This result suggested that an increase in lignin deposition decreased the concentration of apoplastic TPCs that are available to generate potentially toxic intermediates by acting as peroxidase substrates. Thus, data of the present study indicate that lignin formation by laccase activities reduces Mn toxicity and increases Mn tolerance of P. americana by depressing SPOD-mediated formation of toxic intermediates from TPCs.
Starting Page	151
Ending Page	159
Page Count	9
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	34
Issue Number	1
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Apoplast Laccase Lignin Manganese Peroxidase Phytolacca americana Plant Biochemistry Plant Physiology Plant Anatomy/Development Plant Pathology Agriculture Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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