Thermoimaging as a tool for studying light-induced heating of leaves. Correlation of heat dissipation with the efficiency of photosystem II photochemistry and non-photochemical quenching

Radek Kaňa, I. Vass

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Thermoimaging - a highly sensitive and non-invasive method of temperature measurement - was applied to explore the role of changing photosynthetic efficiency in light-induced heating of tobacco (Nicotiana tabacum cv. Samsun) leaves. In the absence of evaporative cooling through the stomata, which was achieved by covering leaves with Vaseline, illumination with 50-1400 μM photons m-2 s-1 intensity of photosynthetically active radiation resulted in ≈1-5 °C leaf temperature increase in about 2 min. The heating effect showed a non-linear correlation with the extent of non-photochemical quenching (NPQ) resulting in higher leaf temperatures at higher NPQ values. When leaves were adapted to excessive irradiance (1300 μM photons m-2 s-1 for 6 h), which resulted in reduction of photosynthetic efficiency and amplification of NPQ the light-induced heating effect was enhanced. The experimental results have been explained on the basis of a simple theoretical model characterizing the balance of energy fluxes in leaves in relation to the efficiency of photosystem II photochemistry and non-photochemical quenching. The role of alternative energy dissipation pathways outside of PSII in the phenomenon of light-induced leaf heating is also discussed.

Original languageEnglish
Pages (from-to)90-96
Number of pages7
JournalEnvironmental and Experimental Botany
Volume64
Issue number1
DOIs
Publication statusPublished - Sep 2008

Fingerprint

photochemistry
photosystem II
dissipation
heating
heat
leaves
temperature
alternative energy
stomata
renewable energy sources
photosynthetically active radiation
energy dissipation
energy flux
tobacco
Nicotiana tabacum
energy balance
irradiance
lighting
amplification
cooling

Keywords

  • Energy balance equation of leaf
  • Leaf temperature
  • NPQ
  • Photosystem II efficiency
  • Thermoimaging

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science
  • Environmental Science(all)

Cite this

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abstract = "Thermoimaging - a highly sensitive and non-invasive method of temperature measurement - was applied to explore the role of changing photosynthetic efficiency in light-induced heating of tobacco (Nicotiana tabacum cv. Samsun) leaves. In the absence of evaporative cooling through the stomata, which was achieved by covering leaves with Vaseline, illumination with 50-1400 μM photons m-2 s-1 intensity of photosynthetically active radiation resulted in ≈1-5 °C leaf temperature increase in about 2 min. The heating effect showed a non-linear correlation with the extent of non-photochemical quenching (NPQ) resulting in higher leaf temperatures at higher NPQ values. When leaves were adapted to excessive irradiance (1300 μM photons m-2 s-1 for 6 h), which resulted in reduction of photosynthetic efficiency and amplification of NPQ the light-induced heating effect was enhanced. The experimental results have been explained on the basis of a simple theoretical model characterizing the balance of energy fluxes in leaves in relation to the efficiency of photosystem II photochemistry and non-photochemical quenching. The role of alternative energy dissipation pathways outside of PSII in the phenomenon of light-induced leaf heating is also discussed.",
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