Figure 9.

Cluster analysis of the Av-spectra of all cultivars of the species Avena sativa (As, oat) for the experiment 1-1. The complete frequency range (3,997–374 cm⁻¹) of the Av-spectra was evaluated with the second derivation and vector normalization, Ward's algorithm und Euclidian distance. The Av-spectra are averages (Av) of FTIR-ATR spectra of the different root segments (100% root tip, 0% root basis etc.; see Figure 1 for scheme, Table 2 for n, Table 1 for names of cultivars and proveniences).