Transcriptome profiling of genes and pathways associated with arsenic toxicity and tolerance in Arabidopsis

BMC Plant Biology

Research Article

Shih-Feng Fu¹  Hao-Jen Huang²  Tsai-Lien Huang²  Po-Yu Chen²  Li-Yao Huang²  Chung-Yi Lin²  Quynh Thi Thuy Nguyen²  Guan-Ru Zeng² 

[1] Department of Biology, National Chunghua University of Education, No.1, Jin-De Road, 500, Changhua, Taiwan;Department of Life Sciences, National Cheng Kung University, No.1 University Road 701, Tainan, Taiwan;

关键词: Arsenate;    Arabidopsis;    Microarray;   

DOI  :  10.1186/1471-2229-14-94

 received in 2013-07-12, accepted in 2014-03-31,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundArsenic (As) is a toxic metalloid found ubiquitously in the environment and widely considered an acute poison and carcinogen. However, the molecular mechanisms of the plant response to As and ensuing tolerance have not been extensively characterized. Here, we report on transcriptional changes with As treatment in two Arabidopsis accessions, Col-0 and Ws-2.ResultsThe root elongation rate was greater for Col-0 than Ws-2 with As exposure. Accumulation of As was lower in the more tolerant accession Col-0 than in Ws-2. We compared the effect of As exposure on genome-wide gene expression in the two accessions by comparative microarray assay. The genes related to heat response and oxidative stresses were common to both accessions, which indicates conserved As stress-associated responses for the two accessions. Most of the specific response genes encoded heat shock proteins, heat shock factors, ubiquitin and aquaporin transporters. Genes coding for ethylene-signalling components were enriched in As-tolerant Col-0 with As exposure. A tolerance-associated gene candidate encoding Leucine-Rich Repeat receptor-like kinase VIII (LRR-RLK VIII) was selected for functional characterization. Genetic loss-of-function analysis of the LRR-RLK VIII gene revealed altered As sensitivity and the metal accumulation in roots.ConclusionsThus, ethylene-related pathways, maintenance of protein structure and LRR-RLK VIII-mediated signalling may be important mechanisms for toxicity and tolerance to As in the species. Here, we provide a comprehensive survey of global transcriptional regulation for As and identify stress- and tolerance-associated genes responding to As.

【 授权许可】

Unknown   
© Fu et al.; licensee BioMed Central Ltd. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.