Thermal Imaging Reliability for Estimating Grain Yield and Carbon Isotope Discrimination in Wheat Genotypes: Importance of the Environmental Conditions

Sebastian Romero-Bravo; Méndez-Espinoza, A.M.; Garriga, Miguel; Estrada, Felix; Escobar, alejandro; Gonzales-Martinez Luis; Poblete-Echeveria Carlos; Sepulveda, Daniel; Matus, IvÁn A.; Castillo, Dalma; del Pozo, Alejandro; Lobos, Gustavo.

Keywords: Remote sensing, phenotype, phenotyping, phenomics, Triticum aestivum, water deficit, stress, infrared

Abstract

Canopy temperature (Tc) by thermal imaging is a useful tool to study plant water status and estimate other crop traits. This work seeks to estimate grain yield (GY) and carbon discrimination (Δ13C) from stress degree day (SDD = Tc − air temperature, Ta), considering the effect of a number of environmental variables such as the averages of the maximum vapor pressure deficit (VPDmax) and the ambient temperature (Tmax), and the soil water content (SWC). For this, a set of 384 and a subset of 16 genotypes of spring bread wheat were evaluated in two Mediterranean-climate sites under water stress (WS) and full irrigation (FI) conditions, in 2011 and 2012, and 2014 and 2015, respectively. The relationship between the GY of the 384 wheat genotypes and SDD was negative and highly significant in 2011 (r2 = 0.52 to 0.68), but not significant in 2012 (r2 = 0.03 to 0.12). Under WS, the average GY, Δ13C, and SDD of wheat genotypes growing in ten environments were more associated with changes in VPDmax and Tmax than with the SWC. Therefore, the amount of water available to the plant is not enough information to assume that a particular genotype is experiencing a stress condition

Más información

Título de la Revista: SENSORS
Volumen: 19
Editorial: MDPI Open Access Publishing
Fecha de publicación: 2019
Idioma: Ingles
Financiamiento/Sponsor: MDPI
DOI:

SENSORS

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