Abstract
Recent studies showed how the density of leaf vascular system can be involved in the performance of physiological parameters. Major veins are commonly elevated in the lower epidermis of the leaf, and this anatomical feature could play a subsidiary role in increasing heat dispersion in the surrounding environment and may help dissipate excess light energy in the leaves. The aim of this study is to analyse the role of the leaf vein network in the heat dissipation process in Vitis vinifera (L.). Major leaf veins were insulated with liquid paraffin and analysed using thermal imaging. A significantly higher temperature was found on the leaf tissues with insulated veins compared to untreated leaves. Further studies are required to assess the real contribution of the leaf vascular network in thermal dissipation.
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Abbreviations
- C p :
-
Specific heat of air at constant pressure
- dT Leaf dt −1 :
-
Rate of temperature changed
- E :
-
Transpiration rate
- g s :
-
Stomatal conductance
- h :
-
Heat-transfer coefficient
- LED:
-
Light-emitting diode
- LE:
-
Evaporation of transpired moisture
- M :
-
Mass per unit of leaf
- P N :
-
Net photosynthetic rate
- ppm:
-
Parts per million
- PSII:
-
Photosystem II
- PAR:
-
Photosynthetic active radiation
- \(\rho\) :
-
Density of air
- R :
-
Net radiant energy flux
- r :
-
Diffusion resistance
- RH:
-
Relative humidity
- s :
-
Specific heat of leaf material
- V D :
-
Leaf vein density
- VPD:
-
Vapour pressure deficit
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Acknowledgements
The authors would like to thank Anna Vidus Rosin (Giakova srl, www.giakova.com) for the technical thermal device support as well as Maria Cristina Monteverdi, Fulvio Ducci and Maria Sole Vallecoccia for their valuable advice.
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MP prepared the plant material and the set-up. MP and LB performed the experimental protocol. MP performed the data analysis; AP, PS and GC supervised the work. All authors contributed to writing the article. All authors read and approved the manuscript.
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Pagano, M., Palliotti, A., Baldacci, L. et al. A possible role of leaf vascular network in heat dissipation in Vitis vinifera L.. Braz. J. Bot 41, 227–231 (2018). https://doi.org/10.1007/s40415-017-0430-z
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DOI: https://doi.org/10.1007/s40415-017-0430-z