Journal Article

Phytosulfokine Stimulates Somatic Embryogenesis in <i>Cryptomeria japonica</i>

Tomohiro Igasaki, Noriko Akashi, Tokuko Ujino-Ihara, Yoshikatsu Matsubayashi, Youji Sakagami and Kenji Shinohara

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 12, pages 1412-1416
Published in print December 2003 | ISSN: 0032-0781
Published online December 2003 | e-ISSN: 1471-9053 | DOI:
Phytosulfokine Stimulates Somatic Embryogenesis in Cryptomeria japonica

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


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Phytosulfokine (PSK), which has been identified as a plant growth factor, had a dramatic stimulatory effect on the formation of somatic embryos of sugi (Cryptomeria japonica) in the presence of polyethylene glycol. The resultant somatic embryos germinated with synchronous sprouting of cotyledons, hypocotyls and roots, and most of the seedlings grew normally. A cDNA clone for the precursor to the PSK peptide of C. japonica was identified in an expressed sequence tags database. Our results support the existence of a PSK signaling pathway in C. japonica.

Keywords: Keywords: Cryptomeria japonica — Phytosulfokine — Regeneration — Somatic embryogenesis — Sugi — Zygotic embryo.; Abbreviations: EST, expressed sequence tags; PEG, polyethylene glycol; PSK, phytosulfokine.

Journal Article.  2872 words.  Illustrated.

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

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