Papers by Pavelas Duchovskis
Applied Photosynthesis, 2012
Central European Journal of Biology, 2013
ABSTRACT This study examines the effect of irradiance level produced by solid-state light-emittin... more ABSTRACT This study examines the effect of irradiance level produced by solid-state light-emitting diodes (LEDs) on the growth, nutritional quality and antioxidant properties of Brassicaceae family microgreens. Kohlrabi (Brassica oleracea var. gongylodes, ‘Delicacy Purple’) mustard (Brassica juncea L., ‘Red Lion’), red pak choi (Brassica rapa var. chinensis, ‘Rubi F1’) and tatsoi (Brassica rapa var. rosularis) were grown using peat substrate in controlled-environment chambers until harvest time (10 days, 21/17°C, 16 h). A system of five lighting modules with 455, 638, 665 and 731 nm LEDs at a total photosynthetic photon flux densities (PPFD) of 545, 440, 330, 220 and 110 µmol m−2s−1 respectively were used. Insufficient levels of photosynthetically active photon flux (110 µmol m−2 s−1) suppressed normal growth and diminished the nutritional value of the Brassica microgreens studied. In general, the most suitable conditions for growth and nutritional quality of the microgreens was 330–440 µmol m−2 s−1 irradiation, which resulted in a larger leaf surface area, lower content of nitrates and higher total anthocyanins, total phenols and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free-radical scavenging capacity. High light levels (545 µmol m−2 s−1), which was expected to induce mild photostress, had no significant positive impact for most of investigated parameters.
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... Daugaard (1999) duomeni-mis, daigus persodinus, braškės dera po 40–60 dienų. Ankstesni duomen... more ... Daugaard (1999) duomeni-mis, daigus persodinus, braškės dera po 40–60 dienų. Ankstesni duomenys rodo, kad, daržovių daigus švitinant HPS lempomis ir HPS su 447 nm LED komponente, išliekamojo poveikio jų derliui nenustatyta (Brazaitytė ir kt., 2009). Galutiniam ben-...
Light is one of the main environmental factors, determining plant growth and development processe... more Light is one of the main environmental factors, determining plant growth and development processes. It is of the high importance in greenhouse horticulture, where lighting strategies determines productivity and production costs. Light emitting diodesthe progressive lighting source and also a handy tool for plant investigations that provided new objectives for photophysiological researches. Light parameters were proved to be limiting factors for plant growth and photosynthesis. Recent investigations show, that light also directly and indirectly affects plant metabolism and thus determines internal phytochemical contents in plant. It decides nutritional value of vegetable food (vitamin, antioxidant contents), as well as external quality and taste. In this study we present the overview, how to employ light parameters as a tool for manipulations of plant metabolic processes, seeking to improve nutritional quality of green vegetables and how to apply light for medicinal plant cultivation with enhanced selected phytochemical contents.
... Kristina liogerytė1, Sandra Sakalauskienė1, Aura Brazaitytė1, Sigitas Lazauskas3, Jurga Sak... more ... Kristina liogerytė1, Sandra Sakalauskienė1, Aura Brazaitytė1, Sigitas Lazauskas3, Jurga Sakalauskaitė1, Ramūnas Sirtautas1, Pavelas Duchovskis1, 2 1 Lietuvos ... tūrio kitimą ar stab-dyti augimą; tai turi įtakos fotoasimiliacinių mediagų kiekio sumaėjimui (Clua ir kt., 2006). ...
1 Lietuvos sodininkystės ir daržininkystės institutas, Kauno g. 30, Babtai, Kauno r., el. paštas ... more 1 Lietuvos sodininkystės ir daržininkystės institutas, Kauno g. 30, Babtai, Kauno r., el. paštas [email protected] 2 Vytauto Didžiojo universitetas, Daukanto g. 28, Lietuvos žemės ūkio universitetas, Kauno r. 4 Lietuvos žemdirbystės institutas, LT-58343 Akademija, Kėdainių r. 5 Kauno medicinos universitetas, Mickevičiaus g. 9, LT-44307 Kaunas.
International Agrophysics
Acta Horticulturae, 2007
cold resistalgg _o{ garden plum (Prznus domestica L) and cherry plum (Prunus cerasifera Ehrh.) cu... more cold resistalgg _o{ garden plum (Prznus domestica L) and cherry plum (Prunus cerasifera Ehrh.) cultivars were studied at the Lithuanian Instituie of Horticulture between 1996-2000. During various wintering periods, trials were carried out in different aspects, which established potentliai cold resistance of cultivars and resistance to lflupl frosts of genotypes. -Cold resistance of one-yearold plum shoots was assessed by the direct friezin!-of the shoots and the differential thermal analysis method. Results obtained from the studies showed that cold resistance of plum in winter is highly affected by temperature fluctuations. Autumn and the beginnin^g of winter, as_ the perlo{ when plums get ready for wintering, are very important for plum hardening. Cold resistance oJ plum -cultivars vari6d in different years of investigation and wintering periods.
We report on the influence of illumination spectrum on grape morphogenesis. The plantlets were cu... more We report on the influence of illumination spectrum on grape morphogenesis. The plantlets were cultivated in vitro using an illumination system based on light-emitting diodes (LEDs). Four groups of LEDs emitting in red (at the wavelengths of 660 mo and 640 nm), blue (450 mo), and far-red (735 om) were exploited and the ratios of the photon flux densities (PFDs) of these spectral components were maintained at selected values. The plantlets were simultaneously cultivated in five growth modules, which were identical except of a preset illumination spectrum. Culture of grape Vitis vinifera L. 'Gailiune' has been cultivated.
Changes in physiological and genetic indices of Lycopersicon esculentum Mill. due to the impact o... more Changes in physiological and genetic indices of Lycopersicon esculentum Mill. due to the impact of cadmium at different substrate acidity and nutrition were studied under controlled conditions in phyto- tron. The amount of photosynthetic pigments, stem diameter, sap flow rate, the mitotic index of cells and inhibition of cell mitosis were investigated. Cadmium in acidic environment produced a very toxic
The objective of our studies was to optimize lighting spectrum for the cultivation of cucumber tr... more The objective of our studies was to optimize lighting spectrum for the cultivation of cucumber transplants under various combinations of light-emitting diodes (LEDs) and to determine the after-effect on yield. Transplants of cucumber hybrid ‛Mandy F1' were grown in 2007 at the Lithuanian Institute of Horticulture in phytotron chambers. After the germination, photoperiod was 18 h and day/night temperature +22/18°C.
The objective of our studies was to evaluate growth, development and yielding of tomato in greenh... more The objective of our studies was to evaluate growth, development and yielding of tomato in greenhouse, which transplants were grown under various combinations of light-emitting diodes illumination. Tomato transplants were grown in phytotron chambers. System of five high-power solid-state lighting modules with the main 447, 638, 669 and 731 nm LEDs were used in the experiments. Supplemental LEDs of different wavelength were used in particular modules: L1 -without additional LEDs, L2 -380 nm, L3 -520 nm, L4 -595 nm, L5 -622 nm. The similar photon flux density (PFD) in all modules was maintained by regulating PFD of 638 nm LEDs. Tomato seedlings were transplanted to peat substratum and grown in greenhouses. It was established that significant effect of illumination using different LEDs combination on growth and development of tomato hybrid 'Raissa' F 1 transplants remained about one month after moving tomato to greenhouses. After-effect on photosynthesis pigments system of tomatoes in greenhouses lasted two weeks. Neither of light-emitting diodes combination had significant effect on early tomato yield. Yellow light, supplemental for the main LEDs combination, used for transplant illumination, decreased total tomato yield.
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Papers by Pavelas Duchovskis