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Plant and Cell Physiology, 1996, Vol. 37, No. 8 1201-1203
© 1996

Rapid Report

Identification of Castasterone, 6-Deoxocastasterone, Typhasterol and 6-Deoxotyphasterol from the Shoots of Arabidopsis thaliana

Shozo Fujioka1,5, Yong-Hwa Choi1, Suguru Takatsuto2, Takao Yokota3, Jianming Li4, Joanne Chory4 and Akira Sakurai1

1The Institute of Physical and Chemical Research (RIKEN) Wako-shi, Saitama, 351-01 Japan
2Department of Chemistry, Joetsu University of Education Joetsu-shi, Niigata, 943 Japan
3Department of Biosciences, Teikyo University Utsunomiya, 320 Japan
4Plant Biology Laboratory, Salk Institute La Jolla, CA 92037, U.S.A.

5To whom correspondence should be addressed.

Endogenous brassinosteroids in the shoots of Arabidopsis thaliana were investigated. Castasterone, 6-deoxocastasterone, typhasterol and 6-deoxotyphasterol were identified by GC-MS. The co-occurrence of 6-deoxo-brassinosteroids and 6-oxo-brassinosteroids suggests that there are both early and late C6-oxidation pathways of brassinosteroids in A. thaliana.

(Received September 17, 1996; Accepted October 11, 1996)
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