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Plant and Cell Physiology, 2003, Vol. 44, No. 12 1412-1416
© 2003 Oxford University Press

Short Communication

Phytosulfokine Stimulates Somatic Embryogenesis in Cryptomeria japonica

Tomohiro Igasaki1,4, Noriko Akashi1, Tokuko Ujino-Ihara2, Yoshikatsu Matsubayashi3, Youji Sakagami3 and Kenji Shinohara1

1 Department of Molecular and Cell Biology, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, 305-8687 Japan
2 Department of Forest Genetics, Forestry and Forest Products Research Institute (FFPRI), Tsukuba, 305-8687 Japan
3 Graduate School of Bio-Agricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan

Abstract

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.

Footnotes

4 Corresponding author: E-mail: iga{at}ffpri.affrc.go.jp; Fax, +81-298-73-0507.


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