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Using Thermography to Confirm Genotypic Variation for Drought Response in Maize.

Raphael A C N Casari1, Dayane S Paiva2, Vivianny N B Silva3,4

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Thermography effectively screens maize genotypes for drought tolerance, mirroring field classifications. However, canopy temperature doesn't fully predict physiological responses under drought, impacting yield correlations.

Keywords:
Zea maysabiotic stresscanopy temperatureplant phenotypingthermal imagewater deficit

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Area of Science:

  • Plant physiology and genetics
  • Agricultural science
  • Drought stress response

Background:

  • Thermography is a viable tool for assessing plant drought tolerance.
  • Previous studies linked thermography to gas exchange, biomass, and yield.
  • Maize genotype classification for drought tolerance is often field-based, primarily using grain yield.

Purpose of the Study:

  • To evaluate thermography for phenotyping contrasting maize genotypes.
  • To compare thermography-based classification with established field classifications for drought tolerance.
  • To determine if canopy temperature accurately reflects physiological responses under drought.

Main Methods:

  • Phenotyping contrasting maize genotypes using thermography.
  • Evaluating gas exchange, daily water consumption, leaf relative water content, biomass, and grain yield.
  • Comparing thermography-based screening with field selection criteria (grain yield).

Main Results:

  • Thermography-based screening of maize genotypes yielded results similar to traditional field methods.
  • Canopy temperature partially correlated with gas exchange and water consumption under drought.
  • Plant structural and physiological changes under drought influenced energy absorption and dissipation.

Conclusions:

  • Thermography is a useful tool for classifying maize genotypes for drought tolerance.
  • Canopy temperature alone may not fully capture complex physiological responses to drought stress.
  • The relationship between cooler canopies and higher yield under drought is not always direct.