@article{MTMT:3281728, title = {Not All Trees Sleep the Same—High Temporal Resolution Terrestrial Laser Scanning Shows Differences in Nocturnal Plant Movement}, url = {https://m2.mtmt.hu/api/publication/3281728}, author = {Zlinszky, András and Molnár, Bence and Barfod, Anders S}, doi = {10.3389/fpls.2017.01814}, journal-iso = {FRONT PLANT SCI}, journal = {FRONTIERS IN PLANT SCIENCE}, volume = {8}, unique-id = {3281728}, issn = {1664-462X}, abstract = {Circadian leaf movements are widely known in plants, but nocturnal movement of tree branches were only recently discovered by using terrestrial laser scanning, a high resolution three-dimensional surveying technique. Terrestrial laser scanning uses a pulsed laser emitted in a regular scan pattern for rapid measurement of distances to the targets, thus producing three dimensional point cloud models of sub-centimeter resolution and accuracy in a few minutes. Here we aim to gain an overview of the variability of circadian movement of small trees across different taxonomic groups, growth forms and leaf anatomies. We surveyed a series of 18 full scans over a 12-hour night period to measure nocturnal changes in shape simultaneously for an experimental setup of 22 plants representing different species. Resulting point clouds were evaluated by comparing changes in height percentiles of laser scanning points belonging to the canopy. Changes in crown shape were observed for all studied trees, but clearly distinguishable sleep movements are apparently rare. Ambient light conditions were continuously dark between sunset (7:30 PM) and sunrise (6:00 AM), but most changes in movement direction occurred during this period, thus most of the recorded changes in crown shape were probably not controlled by ambient light. The highest movement amplitudes,for periodic circadian movement around 2 cm were observed for Aesculus and Acer, compared to non-periodic continuous change in shape of 5 cm for Gleditschia and 2 cm for Fargesia. In several species we detected 2-4 hours cycles of minor crown movement of 0.5-1 cm, which is close to the limit of our measurement accuracy. We present a conceptual framework for interpreting observed changes as a combination of circadian rhythm with a period close to 12 hours, short-term oscillation repeated every 2-4 hours, aperiodic continuous movement in one direction and measurement noise which we assume to be random. Observed movement patterns are interpreted within this framework, and connections with morphology and taxonomy are proposed. We confirm the existence of overnight “sleep” movement for some trees, but conclude that circadian movement is a variable phenomenon in plants, probably controlled by a complex combination of anatomical, physiological and morphological factors.}, year = {2017}, eissn = {1664-462X}, orcid-numbers = {Zlinszky, András/0000-0002-9717-0043; Molnár, Bence/0000-0002-2602-2684} } @article{MTMT:3029809, title = {Quantification of overnight movement of birch (Betula pendula) branches and foliage with short interval terrestrial laser scanning}, url = {https://m2.mtmt.hu/api/publication/3029809}, author = {Puttonen, Eetu and Briese, Christian and Mandlburger, Gottfried and Wieser, Martin and Pfennigbauer, Martin and Zlinszky, András and Pfeifer, Norbert}, doi = {10.3389/fpls.2016.00222}, journal-iso = {FRONT PLANT SCI}, journal = {FRONTIERS IN PLANT SCIENCE}, volume = {7}, unique-id = {3029809}, issn = {1664-462X}, abstract = {BACKGROUND: The goal of the study was to determine circadian movements of silver birch (Petula Bendula) branches and foliage detected with terrestrial laser scanning (TLS). The study consisted of two geographically separate experiments conducted in Finland and in Austria. Both experiments were carried out at the same time of the year and under similar outdoor conditions. Experiments consisted of 14 (Finland) and 77 (Austria) individual laser scans taken between sunset and sunrise. The resulting point clouds were used in creating a time series of branch movements. In the Finnish data, the vertical movement of the whole tree crown was monitored due to low volumetric point density. In the Austrian data, movements of manually selected representative points on branches were monitored. The movements were monitored from dusk until morning hours in order to avoid daytime wind effects. The results indicated that height deciles of the Finnish birch crown had vertical movements between -10.0 and 5.0 cm compared to the situation at sunset. In the Austrian data, the maximum detected representative point movement was 10.0 cm. The temporal development of the movements followed a highly similar pattern in both experiments, with the maximum movements occurring about an hour and a half before (Austria) or around (Finland) sunrise. The results demonstrate the potential of terrestrial laser scanning measurements in support of chronobiology.}, year = {2016}, eissn = {1664-462X}, orcid-numbers = {Zlinszky, András/0000-0002-9717-0043} } @article{MTMT:1011741, title = {Annual fluctuation in amplitudes belonging to daily variations of electrical signals measured in the trunk of a standing tree}, url = {https://m2.mtmt.hu/api/publication/1011741}, author = {Koppán, András and Szarka, László Csaba and Wesztergom, Viktor}, doi = {10.1016/S0764-4469(00)00179-7}, journal-iso = {CR ACAD SCI III SCI VIE}, journal = {COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE III-SCIENCES DE LA VIE-LIFE}, volume = {323}, unique-id = {1011741}, issn = {0764-4469}, year = {2000}, pages = {559-563} } @article{MTMT:147415, title = {Sap-flow velocities and wet-wood cross sections in trunks of healthy and unhealty Quercus robur, Quercus petraea and Quercus cerris trees in a decaying forest in Hungary}, url = {https://m2.mtmt.hu/api/publication/147415}, author = {Fenyvesi, András and Béres, Csilla and Raschi, A and Tognetti, R and Ridder, HW and Molnár, T and Röfler, J and Lakatos, Tamás and Csiha, Imre}, doi = {10.1016/S0045-6535(97)10150-3}, journal-iso = {CHEMOSPHERE}, journal = {CHEMOSPHERE}, volume = {36}, unique-id = {147415}, issn = {0045-6535}, year = {1998}, eissn = {1879-1298}, pages = {931-936}, orcid-numbers = {Béres, Csilla/0000-0002-4104-251X; Lakatos, Tamás/0000-0003-0405-3532} } @article{MTMT:1973855, title = {WATER IN THE STEMS OF SESSILE OAK (QUERCUS-PETRAEA) ASSESSED BY COMPUTER-TOMOGRAPHY WITH CONCURRENT MEASUREMENTS OF SAP VELOCITY AND ULTRASOUND EMISSION}, url = {https://m2.mtmt.hu/api/publication/1973855}, author = {RASCHI, A and TOGNETTI, R and RIDDER, HW and Béres, Csilla}, doi = {10.1111/j.1365-3040.1995.tb00554.x}, journal-iso = {PLANT CELL ENVIRON}, journal = {PLANT CELL AND ENVIRONMENT}, volume = {18}, unique-id = {1973855}, issn = {0140-7791}, abstract = {Concurrent measurements of heat pulse velocity and ultrasound acoustic emission were performed on the trunks of adult Quercus petraea plants under different water stress conditions, On the trunk section of the plants the wood density was measured non-destructively using a mobile computer tomograph which measures the attenuation of a collimated beam of radiation which traverses the trunk, By scanning the trunk in different directions, it is possible to map wood density in the section. As wood density is strictly correlated with water content, this method allows evaluation of the water content in the trunk section and the water conditions in the different parts of the section, The computer-tomograph technique is non-invasive and is not influenced by climatic fluctuations, A close agreement was found between wood density and heat pulse velocity; the relationship between these two parameters and ultrasound acoustic emission is discussed, Trunks of sessile oak appear well suited as water storage reservoirs playing an important role in tree survival during extended periods of low soil water availability, especially in the context of global climatic change, Here the computer-tomograph methodology is described and suggestions are made for further research development.}, keywords = {STRESS; FLOW; CAVITATION; embolism; Quercus petraea; wood density; sap velocity; computer tomograph; THUJA-OCCIDENTALIS L; HEAT PULSE VELOCITY}, year = {1995}, eissn = {1365-3040}, pages = {545-554}, orcid-numbers = {Béres, Csilla/0000-0002-4104-251X} }