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Background  Studies in  Arabidopsis  show that  DELLA  genes may differentially affect responses to biotrophic and necrophic pathogens. A recent report based on the study of DELLA-producing reduced height ( Rht ) genes in wheat and barley also hypothesized that  DELLA  genes likely increased susceptibility to necrotrophs but increased resistance to biotrophs.    Results  Effects of  uzu , a non-GA (gibberellic acid)-responsive semi-dwarfing gene, on Fusarium crown rot (FCR) resistance in barley were investigated. Fifteen pairs of near isogenic lines for this gene were generated and assessed under two different temperature regimes. Similar to its impacts on plant height, the semi-dwarfing gene  uzu  also showed larger effects on FCR severity in the high temperature regime when compared with that in the low temperature regime.    Conclusions  Results from this study add to the growing evidence showing that the effects of plant height on  Fusarium  resistances are unlikely related to  DELLA  genes but due to direct or indirect effects of height difference  per se . The interaction between these two characteristics highlights the importance of understanding relationships between resistance and other traits of agronomic importance as the value of a resistance gene could be compromised if it dramatically affects plant development and morphology.

The non-gibberellic acid-responsive semi-dwarfing gene uzu affects Fusarium crown rot resistance in barley