Fig. 4

Clustering analysis of xylanase genes induced by oat spelt xylan in A. fumigatus Z5. (a) All xylanases and the some protein-identified genes were investigated under the induction of xylan at time points of 0 h, 2 h, 4 h, 6 h and 17 h after sucrose was replaced with xylan. By hierarchical clustering, two clusters were obtained; cluster 1 had no obvious changes in expression levels, but the genes in cluster2 were significantly increased. (b) The role of each xylanase gene in the degradation of xylan was determined by both the rate of increase under induction and its expression level. The solid circles indicate genes; the more abundant genes are colored in red and the less ones are colored in green. The diameter of the circle indicates the gene’s expression level, the y-axis indicates the rate of increase, and the x-axis represents the gene IDs for each solid circle, for which the corresponding enzyme can be found in Additional file 3