Sumai 3. This is remarkable as the cultivars Dream and Sumai 3 represent entirely different origins and resistance levels. Additionally, JA and ET defence signalling pathways were found to be essentially involved in the high level FHB resistance of wheat cv. Wangshuibai in a recent study and were supposed to mediate the early basal defences at 12 to 24 h after F. graminearum infection. However, the contribution of a salicylic acid signalling towards FHB resistance reported in that study was neither observed in our study nor reported for the cv. Sumai 3. On the other hand, a continual Inhibitors,Modulators,Libraries JA production can be involved in pathogen defence as well. Indications for JA inducible as well as for a continual PR gene expression were indeed observed in the cv. Dream and both might contribute to the present FHB resistance.
A Jasmonate responsive and non specific antifungal defence contributes to FHB resistance The enrichment of genes belonging to the 13 LOX path way indicates a systemic accumulation Inhibitors,Modulators,Libraries of endogenous jasmonates in the resistant cv. Dream as a result of F. graminearum infections. It is known that members of the jasmonate family, whose levels increase on pathogen infection, activate a specific set of genes encoding anti microbial peptides. Several cysteine rich AMPs were found to be up regulated in FHB infected cv. Dream spikes, which are possible targets of such resistance related JA signalling, when the two points in time were investigated. The set of identified cysteine rich AMPs comprises lipid transfer proteins, thionins, and defensins.
AV-951 Lipid transfer proteins were the most frequently expressed class of AMPs. Three genes were up regulated independent of the treatment, while two transcripts were up regulated exclusively 72 h after FHB inoculation. Com pared to the other identified cysteine rich AMPs, most of the LTP Inhibitors,Modulators,Libraries genes have shown relatively high fold changes that remained constant at both timepoints. BLASTN analyses proved that all present LTP genes encode for putative non specific lipid Inhibitors,Modulators,Libraries transfer pro teins. Direct antifungal activities and a broad re sistance spectrum against biotrophic and necrotrophic fungal pathogens have been reported for various crop spe cies and tissues, notably with nsLTPs. The observed antifungal activities also include different Fusar ium pathogens, such as F. graminearum and F. solani, as well as F. culmorum and F.
oxysporum. Thereby, nsLTP proteins were found to strongly inhibit the growth of fungal mycelia as well as the germination of fungal spores, including the conidiospores of F. graminearum. Wheat ns LTPs are generally supposed to play a role in an enhanced non specific defence response regulated by different hormonal signals, including jasmonates. In particular, constitutively expressed genes are supposed to contribute to non host resistance. A synergistic activity of nsLTP genes with thionins against F. solani and F.