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Figure 1 | BMC Genomics

Figure 1

From: Transcriptome dynamics of Arabidopsis thaliana root penetration by the oomycete pathogen Phytophthora parasitica

Figure 1

Hierarchical and K-mean clustering of four-fold expressed genes. (A) Hierarchical clustering of the 1806 genes modulated by 4-fold. Pearson correlation method with average linkage on conditions was used. Gene expression level is indicated as a Log2 transformation of relative value calculated on gene average signal value. Green and red were used for down-regulated and up-regulated conditions respectively. Lines mark major K-mean groups. (B) Expression profiles were K-mean clustered based on euclidean distance. The twelve main K-mean clusters are represented. The center line represents average expression with standard deviation. Number of genes within each cluster is indicated. The six clusters used for subsequent characterization of the molecular events occurring during early infection are colored in red. Myc, mycelium; Zoo, zoospores, App, Appressorium; 2.5 h, Arabidopsis thaliana infected roots recovered 2.5 hours after inoculation (appressorium-mediated penetration); 6 h, A. thaliana infected roots recovered 6 hours after inoculation (biotrophic growth, two to three cells invaded); 10.5 h, A. thaliana infected roots recovered 10.5 hours after inoculation (invasive growth along the stele); 30 h, A. thaliana infected roots recovered 30 hours after inoculation (switch to necrotrophy).

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