Figure 2.

Chemical images of a transverse section of three-d-old coleoptile derived from FTIR spectra sampled with a 25- × 25-μm window. A, Phenolic esters sampled at 1,720 cm⁻¹. B, Carboxyl esters of uronic acids sampled at 1,740 cm⁻¹. C, Aromatic substances sampled at 1,515 cm⁻¹. D, Absorbance intensity at 1,000 cm⁻¹ sampled from PC3. E, Absorbance intensity at 1,020 cm⁻¹ sampled from PC3. F, Absorbance at 1,060 cm⁻¹ characteristic of cellulose. G and H, Absorbances at 1,034 and 1,090 cm⁻¹ respectively, characteristic of glucomannan.