Gene Expression Analysis of Alfalfa Seedlings Response to Acid-Aluminum

Figure 2

Principle component analysis for microarray data. Principle component analysis of intact genes detected by microarray from samples under different Al treatments for 60 h. The colored graph shows all data points projected in the three-dimensional space formed by three coordinates after rotation. Each data point represents an independent Al treatment, with the red colored square representing samples treated with pH 6.0 and 0 mM Al, the blue triangle representing samples treated with pH 4.5 and 0 mM Al, the brown circle representing samples treated with pH 4.5 and 0.8 mM Al and the gray rhombus representing samples treated with pH 4.5 and 3.2 mM Al. Samples with the same treatment are closely related and can be encircled together.