Thermal imaging reliability for estimating grain yield and carbon isotope discrimination in wheat genotypes : importance of the environmental conditions

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.

Description

CITATION: Romero-Bravo, S. et al. 2019. Thermal Imaging Reliability for Estimating Grain Yield and Carbon Isotope Discrimination in Wheat Genotypes: Importance of the Environmental Conditions. Sensors, 19(12). doi:10.3390/s19122676
The original publication is available at https://www.mdpi.com/journal/sensors

Keywords

Remote sensing, Phenotype -- Effect of global warming on, Wheat (Triticum eastivum L.) -- Grain yield, Wheat (Triticum eastivum L.) -- Water requirements, Triticum eastivum -- Effect of stress on, Wheat -- Effect of temperature on, Wheat -- Genetics

Citation

Romero-Bravo, S. et al. 2019. Thermal Imaging Reliability for Estimating Grain Yield and Carbon Isotope Discrimination in Wheat Genotypes: Importance of the Environmental Conditions. Sensors, 19(12). doi:10.3390/s19122676

URI

http://hdl.handle.net/10019.1/123412

Collections

Research Articles (Viticulture and Oenology)

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