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Epidermal cells challenged by more than one conidium were not considered. In experiment 1, samples were taken at 24, 48 and 72?h post-inoculation (hpi), whereas in experiment 2, samples were taken at the same time points and an additional time point of 8?days post-inoculation (dpi) to observe possible differences in pathogen growth between interactions later in the infection process. Interaction sites were scored for fungal developmental stages, papilla formation, accumulation of phenolic compounds, H2O2 accumulation in response to primary and appressorial germ tubes (PGT and AGT) and hypersensitive response (HR). Note was taken of whether papillae had effectively stopped fungal development or if papillae became haustorial neck collars. Percentage data were calculated for each leaf replicate. For statistical analysis, percentages were transformed http://www.selleck.cn/products/wnt-c59-c59.html to arcsine square roots (transformed value?=?180/��?��?arcsin [��(%/100)]) to normalize data and stabilize the variance throughout the data range. sas software (SAS Inc.) was used to compute analyses of variances (anova) followed by Tukey's multiple range comparison tests among interactions; differences at P? http://www.selleckchem.com/products/cb-839.html were observed on compatible interactions (IT 3�C4), although colonies were not always joined together (IT 3). Colonies with moderately developed hyphae and only few conidia were observed on the semicompatible interaction (IT 2). No visible symptoms were observed on the incompatible interactions (IT 0). Blumeria graminis development was monitored over a 72-h time course in both experiments 1 and 2, taking http://www.selleckchem.com/products/BI6727-Volasertib.html samples at 12, 24, 48 and 72?hpi. The most significant differences between interactions were found at 72?hpi and therefore only data from this time point are presented (Fig.?1a,c). Data at other time points can be found in Figures S1 and S2 for experiment 1 and 2, respectively. Conidial germination with a short primary germ tube (PGT) and an appressorial germ tube (AGT) was observed at 12?hpi for all interactions. For some interaction sites (between 16 and 44%) the AGT already formed a swollen, hooked apical appressorium. Small but significant differences were found between interactions at this time point (only for experiment 2), indicating that both wheat and triticale isolates germinated at similar rates on any wheat or triticale cultivar, irrespective of whether the interaction was compatible or incompatible.