Fig. 2
From: Effect of phosphorus supply on root traits of two Brassica oleracea L. genotypes
Attenuated total reflection-Fourier transform infrared analysis of root exudates collected from two Brassica oleracea accessions (C6 and F103) grown hydroponically for two weeks in solutions containing 0.025 mM phosphorus (P; Low P; LP) and 0.25 mM P (High P; HP). Average spectra of ten measurements ± standard deviation (a) and principal component analysis, which depicts the first two principal components for response variables grouped by treatments and accessions (b)