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- Title
Aluminum-Induced Ethylene Production is Associated with Inhibition of Root Elongation in Lotus japonicus L.
- Authors
Pei Sun; Qiu-Ying Tian; Min-Gui Zhao; Xiao-Yan Dai; Jian-Hui Huang; Ling-Hao Li; Wen-Hao Zhang
- 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 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.
- Publication
Plant & Cell Physiology, 2007, Vol 48, Issue 8, p1229
- ISSN
0032-0781
- Publication type
Academic Journal
- DOI
10.1093/pcp/pcm077