Abstract
ABSTRACT The non-structural carbon reserves in the various organs of trees are associated with their growth and the mechanism of resilience when exposed to environmental stresses, especially the water deficit. The goal of this study was to develop multivariate models to estimate the amount of non-structural carbohydrates (starch, sucrose, reducing sugars, total sugars and total non-structural carbohydrates) based on near infrared (NIR) spectra measured in solid wood and material reduced to powder. Partial least squares regression was used to associate the amount of non-structural carbohydrates (NSC) obtained by conventional laboratory analysis with NIR spectral signatures. The best predictive models were obtained from the wood reduced to powder. Validity for the NSC prediction in an external set of data presented the following statistics: reducing sugars with R²=0.90 and root mean square error (RMSE) of 2.54% dry matter, total sugars (R²=0.88, RMSE=2.76%), total NSC (R²=0.90, RMSE=2.58%), sucrose (R²=0.82, RMSE=0.06%) and starch (R²=0.80, RMSE=1.03%). The ability of models to estimate the NSC concentration in the growth rings and under divergent environmental conditions demonstrates the potential of the NIR tool to study the physiological responses of plants to different environmental stresses.
Highlights
Non-structural carbons are organic reserves that act in biochemical processes during the growth, development and survival of plants when subjected to stress situations imposed by the environment
The present study aimed to develop models to estimate the contents of starch, sucrose, reducing sugars, total sugars and total nonstructural carbohydrates (NSC) based on near infrared (NIR) spectral signature recorded from samples of solid wood disc and reduced to powder
A clone of the environment of João Pinheiro drastically reduced the fit of the model for starch analysis
Summary
Non-structural carbons are organic reserves that act in biochemical processes during the growth, development and survival of plants when subjected to stress situations imposed by the environment. The laboratory procedures used to detect and quantify NSC are complex, costly and time-consuming, making it difficult to conduct studies that require evaluations in large numbers of samples. To minimize such situations, it is necessary to use techniques that can provide immediate results, but with precision and accuracy close to those provided by traditional methodologies
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