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Plant and Cell Physiology, 2001, Vol. 42, No. 6 673-676
© 2001 Oxford University Press

A Possible Role of Glutathione and Glutathione Disulfide in Tracheary Element Differentiation in the Cultured Mesophyll Cells of Zinnia elegans

Kenji Henmi1, Seiji Tsuboi2, Taku Demura3, Hiroo Fukuda3, Masaki Iwabuchi1 and Ken’ichi Ogawa ,1,4 1 Research Institute for Biological Sciences (RIBS), Okayama, 7459-1 Yoshikawa, Kayo-cho, Okayama, 716-1241 Japan 2 Faculty of Pharmaceutical Sciences, Okayama University, Tsushima-Naka-1, Okayama, 700-8530 Japan 3 Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Hongo, Tokyo, 113-0033 Japan

We investigated the relationship between the cellular redox state of GSH or GSSG and tracheary element (TE) differentiation using a Zinnia experimental system, in which isolated mesophyll cells transdifferentiate to TEs. TE differentiation was suppressed by the application of L-buthionine sulfoximine (BSO), a potent inhibitor of GSH biosynthesis, at the early stage of cell culture. Application of GSSG at the early culture stage promoted the differentiation, but that of GSH or GSSG at an advanced period of culture suppressed the differentiation. Application of GSH and GSSG nullified the TE differentiation-suppressing effect of BSO. The results suggest that changes in the redox states of GSH and GSSG have a role in TE differentiation.

4 Corresponding author: E-mail, ogawa_k@bc4.so-net.ne.jp; Fax, +81-866-56-9454; Phone, +81-866-56-9452.


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