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PLANT PHYSIOLOGY , Vol 103, Issue 3 855-861, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Five Genes Induced by Aluminum in Wheat (Triticum aestivum L.) Roots
K. C. Snowden and R. C. Gardner
Centre for Gene Technology, School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
Five different cDNAs (termed wali1 to wali5 for wheat aluminum induced)
whose expression was induced by Al stress have been isolated from the root
tips of Al-treated wheat (Triticum aestivum L.) plants. Four of these genes
were induced 24 to 96 h after Al treatment, and their expression is reduced
when the Al is removed. Each of these four genes was induced by inhibitory
levels of Al in two wheat cultivars[mdash]Warigal, an Al-sensitive
cultivar, and Waalt, an Al-tolerant cultivar. The fifth gene (wali2) showed
a complex bimodal pattern of induction and was induced by Al only in the
sensitive cultivar. Comparison of the nucleotide sequences of these clones
to those in the sequence data bases showed that wali4 is homologous to
phenylalanine ammonia-lyase and wali1 is homologous to a group of plant
proteins that are cysteine-rich and have homology to metallothioneins.
wali2 encodes a novel protein with a repeating motif of cysteine amino
acids. The remaining two wali clones (wali3 and wali5) encode related,
cysteine-rich proteins that show no significant homology to any known
sequences.
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