Light response curve analysis of juvenile Püspökladányi and Üllői black locust

Ábri, Tamás és Keserű, Zsolt és Csajbók, József (2024) Light response curve analysis of juvenile Püspökladányi and Üllői black locust. In: 11TH HARDWOOD CONFERENCE PROCEEDINGS : Sopron, Hungary, 30-31 May 2024. Hardwood conference proceedings . Soproni Egyetem Kiadó, Sopron, pp. 111-114. ISBN 9789633345184

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Absztrakt (kivonat)

Assimilation (A), intercellular CO2 level (Ci) and stomatal conductance (total conductance of CO2 = gtc) light response curves (A/PPFD, Ci/PPFD, gtc/PPFD curves) of 2-year-old promising black locust clone 'Püspökladányi' and the registered one, 'Üllői', were analyzed, aiming to study A, Ci and gtc in function of Photosynthetic Photon Flux Density (PPFD) levels. The natural logarithmic (A/PPFD and Ci/PPFD) and quadratic (gtc/PPFD) regression functions fitted well to the measured data points for both parameters. The R2 value for the A/PPFD is 0.9745 for 'Püspökladányi' and 0.9444 for the 'Üllői' variety. The R2 values were 0.9499 ('Püspökladányi') and 0.8629 ('Üllői') for the gtc/PPFD curves and 0.8950 ('Püspökladányi') and 0.9112 ('Üllői') for the Ci/PPFD curves. The A/PPFD curves of the tested clones increased steadily with increasing illumination level, but it flattened at the 600 µmol m-2 s-1 PPFD level, which is due to the effect of photorespiration on the assimilation rate. For 'Üllői', the A/PPFD curve decreased at the 1500 µmol m-2 s-1 PPFD level. In contrast to the results for A/PPFD, the Ci/PPFD curve decreased with increasing PPFD level. In case of gtc/PPFD curve, gtc values peak at 900 µmol m-2 s-1 PPFD level for 'Püspökladányi' and 600 µmol m-2 s-1 PPFD level for 'Üllői'. We found significant differences between the A values, as well as the gtc ones. In Europe, negative changes, e.g. increasingly frequent drought, heat, uneven distribution of precipitation, etc., in climate are predicted for the future. Under such conditions, relatively drought-tolerant tree species such as black locust will play an important role in new afforestation and uninterrupted wood supply. Consequently, the growing and improvement of black locust, included the ecophysiological studies of relatively drought tolerant, newly-bred clones is of growing importance.

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