Chemometric Analysis for the Prediction of Biochemical Compounds in Leaves Using UV-VIS-NIR-SWIR Hyperspectroscopy

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Falcioni, Renan ; Goncalves, Joao Vitor Ferreira ; de Oliveira, Karym Mayara ; de Oliveira, Caio Almeida ; Reis, Amanda Silveira ; Crusiol, Luis Guilherme Teixeira ; Furlanetto, Renato Herrig ; Antunes, Werner Camargos ; Cezar, Everson ; de Oliveira, Roney Berti ; Chicati, Marcelo Luiz ; Dematte, Jose Alexandre M. ; Nanni, Marcos Rafael

• Document type: Journal article
• Source: PLANTS-BASEL; v. 12, n. 19, p. 24-pg., 2023-10-01.

Abstract

Reflectance hyperspectroscopy is recognised for its potential to elucidate biochemical changes, thereby enhancing the understanding of plant biochemistry. This study used the UV-VIS-NIR-SWIR spectral range to identify the different biochemical constituents in Hibiscus and Geranium plants. Hyperspectral vegetation indices (HVIs), principal component analysis (PCA), and correlation matrices provided in-depth insights into spectral differences. Through the application of advanced algorithms-such as PLS, VIP, iPLS-VIP, GA, RF, and CARS-the most responsive wavelengths were discerned. PLSR models consistently achieved R2 values above 0.75, presenting noteworthy predictions of 0.86 for DPPH and 0.89 for lignin. The red-edge and SWIR bands displayed strong associations with pivotal plant pigments and structural molecules, thus expanding the perspectives on leaf spectral dynamics. These findings highlight the efficacy of spectroscopy coupled with multivariate analysis in evaluating the management of biochemical compounds. A technique was introduced to measure the photosynthetic pigments and structural compounds via hyperspectroscopy across UV-VIS-NIR-SWIR, underpinned by rapid multivariate PLSR. Collectively, our results underscore the burgeoning potential of hyperspectroscopy in precision agriculture. This indicates a promising paradigm shift in plant phenotyping and biochemical evaluation. (AU)

• FAPESP's process: 21/05129-8 - The Brazilian soil quality determined by geotechnologies: mapping, interpretation and agricultural/environmental applications: a legacy for society
• Grantee: José Alexandre Melo Demattê
• Support Opportunities: Research Projects - Thematic Grants