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Article

Effect of Acorn Thermotherapy and Short-Term Storage on Morphological Characteristics of Related Quercus Robur L. Seedlings

1
Faculty of Forestry and Wood Technology, University of Zagreb, 10000 Zagreb, Croatia
2
Department of Genetics, Forest Tree Breeding and Seed Science, Croatian Forest Research Institute, 10450 Jastrebarsko, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Sara Magrini
Sustainability 2022, 14(3), 1307; https://doi.org/10.3390/su14031307
Received: 21 December 2021 / Revised: 20 January 2022 / Accepted: 21 January 2022 / Published: 24 January 2022
(This article belongs to the Special Issue Close to Nature Forestry – Hope for the European Green Deal)
To preserve the sustainability of Quercus robur forests, which is at risk due to the disturbed natural regeneration, human assisted sowing of acorns or planting of oak seedlings is often performed. However, the success of these methods depends greatly on the use of high-quality sowing and planting material. Thermotherapy is thus often employed to decrease the acorn mycobiota and maintain their quality during the storage. The aim of this study was to test the impact of acorn thermotherapy, followed by a short-term storage at −1 °C or 3 °C, on the quality of related oak seedlings, which was assessed based on the easily observable morphological characteristics. Height, root collar diameter and seedling form were measured or noted for the 1284 and 1190 seedlings at the age of four months and three years, respectively. It was found that acorn thermotherapy affirmatively affected seedling height, especially at the early growth stage. Positive impact on other seedling attributes could not be decisively confirmed because of the lack of the continuity of the effect (not visible in both younger and older seedlings) and the prevailing impact of other factors. Different acorn thermotherapy conditions (temperature and duration) and short-term storage temperatures appeared to be associated only with the occurrence of stem forking at the earlier stage of seedling growth. View Full-Text
Keywords: pedunculate oak; main stem height; root collar diameter; seedling form; field performance pedunculate oak; main stem height; root collar diameter; seedling form; field performance
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MDPI and ACS Style

Kranjec Orlović, J.; Drvodelić, D.; Španjol, E.; Bogunović, S.; Diminić, D.; Oršanić, M. Effect of Acorn Thermotherapy and Short-Term Storage on Morphological Characteristics of Related Quercus Robur L. Seedlings. Sustainability 2022, 14, 1307. https://doi.org/10.3390/su14031307

AMA Style

Kranjec Orlović J, Drvodelić D, Španjol E, Bogunović S, Diminić D, Oršanić M. Effect of Acorn Thermotherapy and Short-Term Storage on Morphological Characteristics of Related Quercus Robur L. Seedlings. Sustainability. 2022; 14(3):1307. https://doi.org/10.3390/su14031307

Chicago/Turabian Style

Kranjec Orlović, Jelena, Damir Drvodelić, Ela Španjol, Sanja Bogunović, Danko Diminić, and Milan Oršanić. 2022. "Effect of Acorn Thermotherapy and Short-Term Storage on Morphological Characteristics of Related Quercus Robur L. Seedlings" Sustainability 14, no. 3: 1307. https://doi.org/10.3390/su14031307

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