Differences in the Growth and the Ecophysiology of Newly Bred, Drought-Tolerant Black Locust Clones

Ábri, Tamás and Borovics, Attila and Csajbók, József and Kovács, Elza and Koltay, András and Keserű, Zsolt and Rédei, Károly Miklós (2023) Differences in the Growth and the Ecophysiology of Newly Bred, Drought-Tolerant Black Locust Clones. FORESTS, 14 (9). ISSN 1999-4907

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Official URL: https://doi.org/10.3390/f14091802


In this study, the growth and physiological performance of four newly bred black locust (Robinia pseudoacacia L.) clones (‘NK1’, ‘NK2’, ‘PL040’, ‘PL251’) together with one registered in Hungary (‘Üllői’) were monitored and compared in a field experiment located in the dry temperate climatic zone of Eastern Central Europe. Tree height and diameter at breast height were measured monthly during May–August 2022, an extremely dry period. Ecophysiological parameters such as leaf temperature, vapor pressure deficit, intercellular carbon dioxide level, transpiration and assimilation rates, and stomatal conductance to water and CO2 were measured in situ. There was a high clonal effect on survival rate and growth of the trees and on the physiological parameters. ‘NK1’ performed best regarding height (1.88 m), while ‘PL040’ (23.76 mm) had the highest diameter increment (n = 16–26). The highest carboxylation efficiency was found in ‘NK2’ (0.077 µmol m−2 s−1), while the lowest was in ‘NK1’ (0.035 µmol m−2 s−1), not showing a significant difference from the ‘Üllői’. Water-use efficiency values were found to be the highest in ‘NK2’ and ‘Üllői’ (4.92 and 4.78 kg m−3, respectively). Ci was found to be maximum in ‘NK1’ and ‘PL040’ (286.15 and 287.37 µmol mol−1, respectively), while it was minimum in ‘Üllői’ (248.30 µmol mol−1). Physiological parameters were found to be significantly different in the clones due to their genetic differences. A strong positive correlation was found between the transpiration and the assimilation rates (r = 0.843–0.994). Within the growing period, the loss of leaves due to abiotic stress was 0 for ‘NK1’ and negligible for the others. ‘NK2’ stood out among the other clones in most of the parameters tested (height, thickness, assimilation, WUE). In addition to its high photosynthetic intensity, its water-use efficiency was also high.

Tudományterület / tudományág

agricultural sciences > forestry and wildlife management


Not relevant


Soproni Egyetem

Item Type: Article
SWORD Depositor: Teszt Sword
Depositing User: Csaba Horváth
Identification Number: MTMT:34125020
Date Deposited: 17 Oct 2023 13:05
Last Modified: 17 Oct 2023 13:05
URI: http://publicatio.uni-sopron.hu/id/eprint/2824

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