Journal Article

Phytochrome Participation in Induction of Haustoria in Cuscuta japonica, a Holoparasitic Flowering Plant

Katsuhisa Furuhashi, Yoshifumi Tada, Kazuhisa Okamoto, Michizo Sugai, Mamoru Kubota and Masakatsu Watanabe

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 8, pages 935-940
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/oxfordjournals.pcp.a029254
Phytochrome Participation in Induction of Haustoria in Cuscuta japonica, a Holoparasitic Flowering Plant

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Seedlings of Cuscuta japonica pasted on an acrylic plate developed many haustoria in response to far-red light after pre-irradiation with white light. The effect of far-red light was cancelled completely by red light irradiated immediately after the far-red light. In order to elucidate the photoreceptor(s) for photocontrol in the induction of haustoria, action spectra for the photo-induction and its reversion were determined in the wavelength region from 340 nm to 800 nm using the Okazaki Large Spectrograph.

The action spectrum for the induction of haustoria had a pronounced peak at 740 nm and a small peak at 420 nm, while the action spectrum for reversal of the induction had a pronounced peak at 660 nm and a small peak at 380 nm. These results indicate that phytochrome is involved in the photocontrol of induction of haustoria in Cuscuta japonica. Considering the far-red /red reversibility, it was suggested that phytochrome B is the photorecepter. This is the first reliable evidence of phytochome participation on development of haustoria in parasitic plants.

Keywords: Action spectrum; Cuscuta japonica; Far-red light; Haustoria; Phytochrome B; Red light

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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