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Plant and Cell Physiology, 2001, Vol. 42, No. 9 1006-1011
© 2001 Oxford University Press

Brassinazole, an Inhibitor of Brassinosteroid Biosynthesis, Inhibits Development of Secondary Xylem in Cress Plants (Lepidium sativum)

Noriko Nagata1,3, Tadao Asami2 and Shigeo Yoshida1,2

1 Plant Science Center, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan 2 Plant Functions Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan

Brassinazole (Brz) is a specific brassinosteroid biosynthesis inhibitor. Cress plants (Lepidium sativum) grown in medium containing Brz exhibited a slight predominance of phloem differentiation at the expense of xylem differentiation and remarkable inhibition of the development of secondary xylem. This result indicates that brassinosteroids function in xylem development in vivo.

3 Corresponding author: E-mail, nagata@postman.riken.go.jp; Fax, +81-48-4675407.


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