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  Barley Fusarium head blight(FHB),caused by species of the Fusarium fungus,is a devastating disease that is reemerging worldwide in recent years.In this study,a novel gene, HvORG4,was cloned from barley by using cDNA library and suppression subtractive hybridization (SSH)library strategies.The SSH library and cDNA library were constructed from the Chinese barley cultivar Jing02-461(resistance to FHB)infected by Fusarium graminearum isolate Huanggang-1. For the SSH analysis,more than 120 differentially expressed cDNAs were identified and sequenced. One of them showed high homology to the AtORG4 gene and was used as a probe to screen the cDNA library of Jing02-461.Six positive clones were identified and one of them contained a full-length cDNA,which was named HvORG4.Sequence analysis showed that HvORG4 encoded a deduced basic protein of 197 amino acids.Northern blotting analysis showed that HvORG4 was constitutively expressed in root and stalk,not in leaf or spike,and strongly induced in barley spikelets in response to infection with F.graminearum isolate Huanggang-1.Its homology and expression profile suggest that the HvORG4 might function as a transcription factor,playing an important role in signal transduction pathway for defense against FHB in barley.……   
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