Abstract
The concept ‘functional genomics’ refers to the methods used for the functional characterisation of genomes. The methods utilised provide new opportunities for studying the nature and role of defence mechanisms in plants. Unlike Arabidopsis, poplar and rice, the full genomic sequence of barley is not available. In this case, the analysis of barley gene expression data plays a pivotal role for obtaining insight into the functional characterisation of individual gene products. Many genes are activated transcriptionally following attack by pathogens and these often contribute to the defence mechanisms which underlie disease resistance. The use of large-scale complementary DNA library constructions and genome-wide transcript profiles of plants exposed to biotic stress provide the data required to drive hypotheses concerning the function of newly identified genes. In this paper, we illustrate how publicly available gene expression data has proved valid for studies of plant defence responses; enabling a cost-effective workflow starting from isolated gene transcripts to elucidation of biological function upon biotic stress.
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