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JXB Advance Access published online on October 9, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl150
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received April 3, 2006
Accepted August 7, 2006

RESEARCH PAPER

ABP1 expression regulated by IAA and ABA is associated with the cambium periodicity in Eucommia ulmoides Oliv

Hong-Wei Hou 1 *, Yu-Ting Zhou 2 *, Kalima-N'Koma Mwange 3 *, Wan-Feng Li 4, Xin-Qiang He 4, and Ke-Ming Cui 4 *

1 College of Life Sciences, Peking University, Beijing 100871, Chinal; Present address: Department of Biological Sciences, University of Lethbridge, Lethbridge, AB, Canada T1K 3M4
2 College of Life Sciences, Peking University, Beijing 100871, China; Present address: Yuncheng University, Yuncheng, Shanxi Province, China
3 College of Life Sciences, Peking University, Beijing 100871, China; Present address: Commissariat Général à l'Energie Atomique/CREN-K, B.P. 868, Kinshasa XI, R. D. Congo
4 College of Life Sciences, Peking University, Beijing 100871, China

* To whom correspondence should be addressed.
Ke-Ming Cui, E-mail: ckm{at}pku.edu.cn


  Abstract

A cDNA clone of Eucommia ulmoides Oliv. encoding auxin binding protein 1 (ABP1), one of the putative receptors of auxin, was isolated, and the seasonal expression of ABP1 in relation to IAA and ABA annual variation was investigated by different technical approaches including RT-PCR, real-time PCR, northern blotting, western blotting, and immunolocalization. In the cambial region, ABP1 expression at both the protein and the mRNA level was found to be high, low, and remarkably scarce in the active, quiescent, and resting stages, respectively, during cambium periodicity. The signal abundance of ABP1 follows the opposite pattern to ABA accumulation and correlates with auxin responsiveness of the cambial tissues, suggesting a role for ABP1 in mediating auxin-dependent regulation of cambial activation in the activity-dormancy cycle. This paper attempts to explain why IAA would ‘boost’ the reactivation of a quiescent cambium, and not that of a resting cambium. Results also show that ABP1 expression is improved by IAA, while inhibited by ABA.

Keywords: ABA; ABP1; dormancy; Eucommia ulmoides; IAA; quiescence; rest.

*These authors contributed equally to this work


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