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Research ArticlePLANT-MICROBE AND PLANT-INSECT INTERACTIONS
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Flavonoids Promote Haustoria Formation in the Root ParasiteTriphysaria versicolor

Huguette Albrecht, John I. Yoder, Donald A. Phillips
Huguette Albrecht
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John I. Yoder
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Donald A. Phillips
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Published February 1999. DOI: https://doi.org/10.1104/pp.119.2.585

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  • Copyright © 1999 American Society of Plant Physiologists

Abstract

Parasitic plants in the Scrophulariaceae develop infective root structures called haustoria in response to chemical signals released from host-plant roots. This study used a simple in vitro assay to characterize natural and synthetic molecules that induce haustoria in the facultative parasiteTriphysaria versicolor. Several phenolic acids, flavonoids, and the quinone 2,6-dimethoxy-p-benzoquinone induced haustoria in T. versicolor root tips within hours after treatment. The concentration at which different molecules were active varied widely, the most active being 2,6-dimethoxy-p-benzoquinone and the anthocyanidin peonidin. Maize (Zea mays) seeds are rich sources of molecules that induce T. versicolor haustoria in vitro, and chromatographic analyses indicated that the active molecules present in maize-seed rinses include anthocyanins, other flavonoids, and simple phenolics. The presence of different classes of inducing molecules in seed rinses was substantiated by the observation that maize kernels deficient in chalcone synthase, a key enzyme in flavonoid biosynthesis, released haustoria-inducing molecules, although at reduced levels compared with wild-type kernels. We discuss these results in light of existing models for host perception in the related parasitic plant Striga.

  • Abbreviations:

    CHS
    chalcone synthase
    DMBQ
    2,6-dimethoxy-p-benzoquinone
    HIF
    haustoria-inducing factor
    • Received June 17, 1998.
    • Accepted October 21, 1998.
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    Flavonoids Promote Haustoria Formation in the Root ParasiteTriphysaria versicolor
    Huguette Albrecht, John I. Yoder, Donald A. Phillips
    Plant Physiology Feb 1999, 119 (2) 585-592; DOI: 10.1104/pp.119.2.585

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    Flavonoids Promote Haustoria Formation in the Root ParasiteTriphysaria versicolor
    Huguette Albrecht, John I. Yoder, Donald A. Phillips
    Plant Physiology Feb 1999, 119 (2) 585-592; DOI: 10.1104/pp.119.2.585
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    Plant Physiology: 119 (2)
    Plant Physiology
    Vol. 119, Issue 2
    Feb 1999
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