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Journal of Experimental Botany, Vol. 54, No. 389, pp. 1899-1907, August 1, 2003
© 2003 Oxford University Press

Relationship between endogenous indole-3-acetic acid and abscisic acid changes and bark recovery in Eucommia ulmoides Oliv. after girdling

Received 25 December 2002; Accepted 2 May 2003

Kalima N’Koma Mwange1,2, Hong-Wei Hou1 and Ke-Ming Cui*,1

1 Peking University, College of Life Sciences, Dept of Plant Molecular and Developmental Biology, Beijing 100871, PR China
2 Commissariat Général à l’Energie Atomique-CREN-K, BP 868, Kinshasa XI, Democratic Republic of the Congo

* To whom correspondence should be sent. Fax: +86 10 62751526. E-mail: ckm{at}pku.edu.cn

Eucommia ulmoides (Eucommiaceae), a traditional Chinese medicinal plant, is often subjected to severe manual peeling of its bark. If the girdled trunk is well protected from desiccation, new bark forms within 1 month. It has been proposed that phytohormones play a key role in this process. Research has been conducted to determine the distribution of endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) during the bark recovery, using high-performance liquid-chromatography (HPLC) and fluoro-immuno-localization techniques. Results showed that, from 2 d after girdling, the IAA content in the recovering bark (RB) increased markedly while that of ABA decreased. The opposite pattern was observed during progressive re-establishment of the tissues. Immuno-localization showed that most of the IAA was located in the RB tissue layers undergoing cell division, dedifferentiation and (re)differentiation, such as xylary rays, immature xylem, phellogen and cambial regions. This study also provides evidence that IAA and ABA are involved in the bark reconstitution.

Key words: Abscisic acid (ABA), auxin (IAA), bark recovery, cambial region, dedifferentiation, Eucommia ulmoides, girdling, HPLC, immuno-localization.


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