Fig. 4

Representative of normalized ATR FT-IR spectra of three F₂ progeny cotton plants with MIC values of 5.13, 4.65, and 2.09. The three F₂ plants were selected from the different genotype plants (WT-homo, WT-hetro, and im-homo) shown in Fig. 1b. Each spectrum shown in the graph was normalized by dividing the intensity of individual vibration with the average intensity. Two wavenumbers (1 055 cm^− 1 and 1 020 cm^− 1) showing differences in the intensities among the cotton fibers were marked with purple arrows