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Type: Artigo de periódico
Title: Transcriptional profiling of aluminum toxicity and tolerance responses in maize roots
Author: Maron, LG
Kirst, M
Mao, C
Milner, MJ
Menossi, M
Kochian, LV
Abstract: Aluminum (Al) toxicity is a major factor limiting crop yields on acid soils. There is considerable genotypic variation for Al tolerance in most common plant species. In maize (Zea mays), Al tolerance is a complex phenomenon involving multiple genes and physiological mechanisms yet uncharacterized. To begin elucidating the molecular basis of maize Al toxicity and tolerance, a detailed temporal analysis of root gene expression under Al stress was performed using microarrays with Al-tolerant and Al-sensitive genotypes. Al altered the expression of significantly more genes in the Al-sensitive genotype, presumably as a result of more severe Al toxicity. Nevertheless, several Al-regulated genes exhibited higher expression in the Al-tolerant genotype. Cell wall-related genes, as well as low phosphate-responsive genes, were found to be regulated by Al. In addition, the expression patterns of genes related to Al-activated citrate release indicated that in maize this mechanism is probably regulated by the expression level and/or function of the citrate transporter. This study is the first comprehensive survey of global transcriptional regulation under Al stress. The results described here will help to further our understanding of how mechanisms of Al toxicity and tolerance in maize are regulated at the transcriptional level.
Subject: aluminum (Al)
cell wall
gene expression
maize (Zea mays)
organic acids
Country: EUA
Editor: Wiley-blackwell
Citation: New Phytologist. Wiley-blackwell, v. 179, n. 1, n. 116, n. 128, 2008.
Rights: fechado
Identifier DOI: 10.1111/j.1469-8137.2008.02440.x
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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