Journal Article

Aluminum-Induced Ethylene Production is Associated with Inhibition of Root Elongation in <i>Lotus japonicus</i> L.

Pei Sun, Qiu-Ying Tian, Min-Gui Zhao, Xiao-Yan Dai, Jian-Hui Huang, Ling-Hao Li and Wen-Hao Zhang

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 8, pages 1229-1235
Published in print August 2007 | ISSN: 0032-0781
Published online August 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm077
Aluminum-Induced Ethylene Production is Associated with Inhibition of Root Elongation in Lotus japonicus L.

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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 the legume model plants 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 the ethylene-releasing substance, ethephon, and the ethylene precursor, 1-aminocyclopropane-1-carboxylic 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+ increased the activity of ACC oxidase (ACO), and 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

Journal Article.  3582 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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