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Plant and Cell Physiology Advance Access published online on June 14, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm077
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Aluminum-induced ethylene production is associated with inhibition of root elongation in Lotus japonicus L.

Pei Sun1,2,3, Qiu-Ying Tian2,3, Min-Gui Zhao2, Xiao-Yan Dai2, Jian-Hui Huang2, Ling-Hao Li2 and Wen-Hao Zhang2,*

1. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, P. R. China
2. Key laboratory of Vegetation and Environmental Change, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, P. R. China

*Corresponding author: Wen-Hao Zhang. Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, P. R. China. Phone: 86-10- 6283 6697, FAX: 86-10- 6259 2430, E-mail: whzhang{at}ibcas.ac.cn


  Abstract

Inhibition of root elongation by toxic aluminum (Al3+) occurs rapidly and is one of the most distinct and earliest symptoms of Al toxicity. To elucidate mechanism underlying Al3+ -induced inhibition of root elongation, we investigated the involvement of ethylene in Al3+ -induced inhibition of root elongation using legume model plants of Lotus japonicus and Medicago truncatula. Root elongation of L. japonicus and M. truncatula was rapidly inhibited by exposure to AlCl3. A similar rapid inhibition of root elongation by ethylene-releasing substance, ethephon, and ethylene precursor, 1-aminocyclopropane-1-1carboxylic acid (ACC) was also observed. The Al3+-induced inhibition of root elongation was substantially ameliorated in the presence of antagonists of ethylene biosynthesis (Co2+ and aminoethoxyvinylglycine, AVG). Al3+ inhibited activity of ACC oxidase (ACO) , induced a rapid evolution of ethylene from root apices and expression of genes of ACC synthase (ACS) and ACO. These findings suggest that induction of ethylene evolution resulting from up-regulation of ACS and ACO plays a critical role in Al3+-induced inhibition of root elongation.

Keywords: Aluminum toxicity - Ethylene production - Lotus japonicus - Medicago truncatula - Root elongation

3. These authors contributed equally to this work.


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P. Sun, Q.-Y. Tian, J. Chen, and W.-H. Zhang
Aluminium-induced inhibition of root elongation in Arabidopsis is mediated by ethylene and auxin
J. Exp. Bot., October 25, 2009; (2009) erp306v1.
[Abstract] [Full Text] [PDF]


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