Aluminum/toxicity; Arabidopsis Proteins/metabolism; Arabidopsis/enzymology; Gene Expression Regulation, Enzymologic; Glucans/metabolism; Xylans/metabolism; Amino Acid Sequence; Arabidopsis/chemistry; Arabidopsis/drug effects; Arabidopsis/genetics; Arabidopsis Proteins/genetics; Cell Wall/metabolism; Chelating Agents/analysis; Chelating Agents/metabolism; Down-Regulation; Gene Expression Regulation, Plant; Glucans/analysis; Glycosyltransferases/genetics; Glycosyltransferases/metabolism; Mutagenesis, Insertional; Organ Specificity; Phenotype; Phylogeny; Plant Leaves/chemistry; Plant Leaves/drug effects; Plant Leaves/enzymology; Plant Leaves/genetics; Plant Roots/chemistry; Plant Roots/drug effects; Plant Roots/enzymology; Plant Roots/genetics; Plants, Genetically Modified; Polysaccharides/analysis; Polysaccharides/metabolism; Recombinant Fusion Proteins; Seedlings/chemistry; Seedlings/drug effects; Seedlings/enzymology; Seedlings/genetics; Sequence Analysis, DNA; Xylans/analysis