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Hyperspectral analysis of foliar degradation in lisianthus cut flowers Floral stems of lisianthus were submitted to conservative solutions of different concentrations of sucrose, glucose, different phytohormones or distilled water for 12 hours and later maintained in water and germicides for 12 days in an acclimatized environment. Leaves of these stems were collected every 4 days for later hyperspectral analysis (450 to 2450 nm) and pigment quantification. In order to analyse the use of the spectra to detect the preservative solutions performance, the Tukey test was used at each wavelength between these solutions or between the analysis days, which showed differences in the regions of the spectrum demonstrating the leaves degradation or maintenance for each solution. Another achieved result was the discrimination of different post-harvest periods from the spectral data, which was obtained through multivariate analysis; but the same analysis was not successful in separating preservative solutions. Finally, the pigments prediction from spectral curves in PLSR (Partial Least Squares Regression) was evaluated, and the determination of chlorophyll was not possible, but the ratio CAR / CLF (ratio of carotenoids to chlorophyll) presented reasonable coefficients determination. Thus, the hyperspectral analyses have potential in the evaluation of foliar degradation of lisianthus floral stems in different pulsing solutions used in post-harvest.

Análise hiperespectral da degradação das folhas de lisianthus de corte