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Common wheat is a hexaploid species with most of the genes present as triplicate homoeologs. Expression divergences of homoeologs are frequently observed in wheat, as well as in other polyploid plants. However, the mechanisms underlying this phenomenon are poorly understood.Expansin genes play important roles in the regulation of cell size, as well as organ size. We found that all three TaEXPA1 homoeologs...
Expansins are thought to be key regulators of cell wall extension during plant growth. In this study, we isolated 18 expansin genes from wheat, nine of which encode α-expansins while the other nine code for β-expansins. The cysteine-rich and tryptophan-rich regions of the deduced amino acid sequences of all 18 expansins were highly conserved. Genomic sequences were obtained for 17 of the genes, and...
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