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The consumption of microgreens has increased due to their having higher levels of bioactive compounds and mineral nutrients than mature plants. The lighting conditions during the cultivation of microgreens, if optimally selected, can have a positive effect by further increasing their nutritional value. Thus, our study aimed to determine the changes in mineral nutrients contents of Brassicaceae microgreens depending on different blue–red (B:R) light ratios in light-emitting diode (LED) lighting and to evaluate their growth and nutritional value according to different indexes. Experiments were performed in controlled environment growth chambers at IH LRCAF, 2020. Microgreens of mustard (Brassica juncea ‘Red Lace’) and kale (Brassica napus ‘Red Russian’) were grown hydroponically under different B:R light ratios: 0%B:100%R, 10%B:90%R, 25%B:75%R, 50%B:50%R, 75%B:25%R, and 100%B:0%R. A 220 μmol m−2 s−1 total photon flux density (TPFD), 18 h photoperiod, 21/17 ± 2 °C temperature and 60% ± 5% relative humidity in the growth chamber were maintained during cultivation. We observed that an increasing percentage of blue light in the LED illumination spectrum during growth was associated with reduced elongation in the microgreens of both species and had a positive effect on the accumulation of mostly macro- and micronutrients. However, different B:R light ratios indicate a species-dependent response to changes in growth parameters such as leaf area, fresh and dry mass, and optical leaf indexes such as for chlorophyll, flavonol, anthocyanin, and carotenoid reflectance.
Aušra Brazaitytė; Jurga Miliauskienė; Viktorija Vaštakaitė-Kairienė; Rūta Sutulienė; Kristina Laužikė; Pavelas Duchovskis; Stanisław Małek. Effect of Different Ratios of Blue and Red LED Light on Brassicaceae Microgreens under a Controlled Environment. Plants 2021, 10, 801 .
AMA StyleAušra Brazaitytė, Jurga Miliauskienė, Viktorija Vaštakaitė-Kairienė, Rūta Sutulienė, Kristina Laužikė, Pavelas Duchovskis, Stanisław Małek. Effect of Different Ratios of Blue and Red LED Light on Brassicaceae Microgreens under a Controlled Environment. Plants. 2021; 10 (4):801.
Chicago/Turabian StyleAušra Brazaitytė; Jurga Miliauskienė; Viktorija Vaštakaitė-Kairienė; Rūta Sutulienė; Kristina Laužikė; Pavelas Duchovskis; Stanisław Małek. 2021. "Effect of Different Ratios of Blue and Red LED Light on Brassicaceae Microgreens under a Controlled Environment." Plants 10, no. 4: 801.
The objective of this study was to evaluate how different UV-A wavelengths influence the morphology and photosynthetic behavior of red-leaf lettuce (Lactuca sativa L. cv. Maiko). In the experiments, the main photosynthetic photon flux consisted of red (R) and blue (B) light, supplemented with equal doses of different UV-A wavelengths (402, 387 and 367 nm). Treating the crops with low dosages of specific narrow-band UV-A radiation at key points in the life cycle initiated a cascade of responses in the above-ground biomass. According to the results, red-leaf lettuces acclimated to longer UV-A wavelengths by increasing biomass production, whereas different UV-A wavelengths had no significant effect on plant senescence reflectance, nor on the normalized difference vegetation index. A significant decrease in the maximum quantum yield of the PSII photochemistry of dark (Fv/Fm) and light (ΦPSII) adapted plants was observed. A lack of significant changes in non-photochemical fluorescence quenching indicates that photo-inhibition occurred under RBUV367, whereas the photosynthetic response under RB, RBUV402, and RBUV387 suggests that there was no damage to PSII. The correlation of the photosynthetic rate (Pr) with the stomatal conductance (gs) indicated that the increase in the Pr of lettuce under supplemental UV-A radiation was due to the increase of gs, instead of the ratio of the intracellular to ambient CO2 content (Ci/Ca) or stomatal limitations.
Giedrė Samuolienė; Akvilė Viršilė; Jurga Miliauskienė; Perttu Haimi; Kristina Laužikė; Julė Jankauskienė; Algirdas Novičkovas; Asta Kupčinskienė; Aušra Brazaitytė. The Photosynthetic Performance of Red Leaf Lettuce under UV-A Irradiation. Agronomy 2020, 10, 761 .
AMA StyleGiedrė Samuolienė, Akvilė Viršilė, Jurga Miliauskienė, Perttu Haimi, Kristina Laužikė, Julė Jankauskienė, Algirdas Novičkovas, Asta Kupčinskienė, Aušra Brazaitytė. The Photosynthetic Performance of Red Leaf Lettuce under UV-A Irradiation. Agronomy. 2020; 10 (6):761.
Chicago/Turabian StyleGiedrė Samuolienė; Akvilė Viršilė; Jurga Miliauskienė; Perttu Haimi; Kristina Laužikė; Julė Jankauskienė; Algirdas Novičkovas; Asta Kupčinskienė; Aušra Brazaitytė. 2020. "The Photosynthetic Performance of Red Leaf Lettuce under UV-A Irradiation." Agronomy 10, no. 6: 761.
Ultraviolet A (UV-A) light-emitting diodes (LEDs) could serve as an effective tool for improving the content of health-promoting bioactive compounds in plants in controlled-environment agriculture (CEA) systems. The goal of this study was to investigate the effects of UV-A LEDs at different wavelengths (366, 390, and 402 nm) and durations (10 and 16 h) on the growth and phytochemical contents of mustard microgreens (Brassica juncea L. cv. “Red Lion”), when used as supplemental light to the main LED lighting system (with peak wavelengths of 447, 638, 665, and 731 nm). Plants were grown for 10 days under a total photon flux density (TPFD) of 300 µmol m−2 s−1 and 16-h light/8-h dark period. Different UV-A wavelengths and irradiance durations had varied effects on mustard microgreens. Supplemental UV-A radiation did not affect biomass accumulation; however, the longest UV-A wavelength (402 nm) increased the leaf area of mustard microgreens, regardless of the duration of irradiance. The concentration of the total phenolic content and α-tocopherol mostly increased under 402-nm UV-A, while that of nitrates increased under 366- and 390-nm UV-A at both radiance durations. The contents of lutein/zeaxanthin and β-carotene increased in response to the shortest UV-A wavelength (366 nm) at 10-h irradiance as well as longer UV-A wavelength (390 nm) at 16 h irradiance. The most positive effect on the accumulation of mineral elements, except iron, was observed under longer UV-A wavelengths at 16-h irradiance. Overall, these results suggest that properly composed UV-A LED parameters in LED lighting systems could improve the nutritional quality of mustard microgreens, without causing any adverse effects on plant growth.
Aušra Brazaitytė; Akvilė Viršilė; Giedrė Samuolienė; Viktorija Vaštakaitė-Kairienė; Julė Jankauskienė; Jurga Miliauskienė; Algirdas Novičkovas; Pavelas Duchovskis. Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs. Frontiers in Plant Science 2019, 10, 1153 .
AMA StyleAušra Brazaitytė, Akvilė Viršilė, Giedrė Samuolienė, Viktorija Vaštakaitė-Kairienė, Julė Jankauskienė, Jurga Miliauskienė, Algirdas Novičkovas, Pavelas Duchovskis. Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs. Frontiers in Plant Science. 2019; 10 ():1153.
Chicago/Turabian StyleAušra Brazaitytė; Akvilė Viršilė; Giedrė Samuolienė; Viktorija Vaštakaitė-Kairienė; Julė Jankauskienė; Jurga Miliauskienė; Algirdas Novičkovas; Pavelas Duchovskis. 2019. "Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs." Frontiers in Plant Science 10, no. : 1153.
This study evaluated the effects of light intensity and the spectrum produced by light-emitting diodes (LEDs) on the growth and nitrate assimilation of tatsoi (Brassica rapa var. rosularis), grown in a controlled environment. A system of high-powered solid-state lighting modules with blue 445, red 640 and 660 and far-red 731 nm LEDs were used for illumination. Two experiments were performed seeking to explore the light parameter effects on tatsoi growth, nitrate, nitrite, total protein, and free amino acid contents, as well as soluble sugar contents and chlorophyll indexes: (1) investigation of the effects of a photosynthetically active photon flux density (PPFD) of 100, 200, 300, 400 and 500 μmol m–2 s–1 and (2) evaluation of the effects of different combinations of red (R660 and R660 + R640), red supplemented with blue (R660 + B445 and R660 + R640+B445) and far red (R660 + R640+B445+FR731) LEDs. A deficient light intensity resulted in nitrate and nitrite accumulation in tatsoi leaves; under the exposure of 100 μmol m–2 s–1 PPFD, tatsoi contained 3.4 times higher NO3 and 34 times higher NO2 contents, compared to that under 200 μmol m–2 s–1. The photosynthetic photon flux density of ∼300 μmol m2 s−1 allowed the obtaining of an optimal tatsoi production with high biomass and minimal nitrate and nitrite contents in the leaves. Long term exposure of sole red light was stressful for tatsoi growth; however the addition of blue light to the red 660- and 640- nm LEDs resulted in the highest total protein and essential amino acid contents, leaf area and biomass, and significantly reduced nitrate but increased nitrite content.
Akvilė Viršilė; Aušra Brazaitytė; Viktorija Vaštakaitė-Kairienė; Julė Jankauskienė; Jurga Miliauskienė; Giedrė Samuolienė; Algirdas Novičkovas; Pavelas Duchovskis. Nitrate, nitrite, protein, amino acid contents, and photosynthetic and growth characteristics of tatsoi cultivated under various photon flux densities and spectral light compositions. Scientia Horticulturae 2019, 258, 108781 .
AMA StyleAkvilė Viršilė, Aušra Brazaitytė, Viktorija Vaštakaitė-Kairienė, Julė Jankauskienė, Jurga Miliauskienė, Giedrė Samuolienė, Algirdas Novičkovas, Pavelas Duchovskis. Nitrate, nitrite, protein, amino acid contents, and photosynthetic and growth characteristics of tatsoi cultivated under various photon flux densities and spectral light compositions. Scientia Horticulturae. 2019; 258 ():108781.
Chicago/Turabian StyleAkvilė Viršilė; Aušra Brazaitytė; Viktorija Vaštakaitė-Kairienė; Julė Jankauskienė; Jurga Miliauskienė; Giedrė Samuolienė; Algirdas Novičkovas; Pavelas Duchovskis. 2019. "Nitrate, nitrite, protein, amino acid contents, and photosynthetic and growth characteristics of tatsoi cultivated under various photon flux densities and spectral light compositions." Scientia Horticulturae 258, no. : 108781.
Understanding plant responses to light quantity in indoor horticultural systems is important for optimising lettuce growth and metabolism as well as energy utilisation efficiency. Light intensity and photoperiod sufficient for normal plant growth parameters might be not efficient for nitrate assimilation. Therefore, this study explored and compared the effects of different light intensities (100-500 μmol m-2 s-1 ) and photoperiods (12-24 h) on the growth and nitrate assimilation in red and green leaf lettuce (Lactuca sativa L.). For efficient nitrate assimilation, 300-400 μmol m-2 s-1 photosynthetic photon flux density (PPFD) and 16-18 h photoperiod is necessary for red and green lettuces. The insufficient light quantity resulted in reduced growth and remarkable increase in nitrate and nitrite contents in both cultivars. Short photoperiods, similarly to low PPFD, growth parameters, chlorophyll indices and nitrate assimilation indices showed the shortage of photosynthetic products for normal plant physiological processes. Short photoperiods had the least pronounced effect on nitrate and nitrite contents in lettuce leaves. Light intensity was superior compared to photoperiods for efficient nitrate assimilation in both lettuce cultivars. Under short photoperiods, similarly to low intensity, growth parameters, chlorophyll index and nitrate assimilation indices showed a shortage of photosynthetic products for normal physiological processes. The free amino acid concentration increased, but it was not efficiently incorporated in proteins, as their level in lettuce was lower compared to those for moderate photoperiods. © 2019 Society of Chemical Industry.
Akvilė Viršilė; Aušra Brazaitytė; Viktorija Vaštakaitė‐Kairienė; Jurga Miliauskienė; Julė Jankauskienė; Algirdas Novičkovas; Giedrė Samuolienė. Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce. Journal of the Science of Food and Agriculture 2019, 99, 6608 -6619.
AMA StyleAkvilė Viršilė, Aušra Brazaitytė, Viktorija Vaštakaitė‐Kairienė, Jurga Miliauskienė, Julė Jankauskienė, Algirdas Novičkovas, Giedrė Samuolienė. Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce. Journal of the Science of Food and Agriculture. 2019; 99 (14):6608-6619.
Chicago/Turabian StyleAkvilė Viršilė; Aušra Brazaitytė; Viktorija Vaštakaitė‐Kairienė; Jurga Miliauskienė; Julė Jankauskienė; Algirdas Novičkovas; Giedrė Samuolienė. 2019. "Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce." Journal of the Science of Food and Agriculture 99, no. 14: 6608-6619.
Akvilė Viršilė; Aušra Brazaitytė; Julė Jankauskienė; Jurga Miliauskienė; Viktorija Vaštakaitė; Ingrida Odminytė; Algirdas Novičkovas; Giedrė Samuolienė. Pre-harvest LED lighting strategies for reduced nitrate contents in leafy vegetables. Zemdirbyste-Agriculture 2018, 105, 249 -256.
AMA StyleAkvilė Viršilė, Aušra Brazaitytė, Julė Jankauskienė, Jurga Miliauskienė, Viktorija Vaštakaitė, Ingrida Odminytė, Algirdas Novičkovas, Giedrė Samuolienė. Pre-harvest LED lighting strategies for reduced nitrate contents in leafy vegetables. Zemdirbyste-Agriculture. 2018; 105 (3):249-256.
Chicago/Turabian StyleAkvilė Viršilė; Aušra Brazaitytė; Julė Jankauskienė; Jurga Miliauskienė; Viktorija Vaštakaitė; Ingrida Odminytė; Algirdas Novičkovas; Giedrė Samuolienė. 2018. "Pre-harvest LED lighting strategies for reduced nitrate contents in leafy vegetables." Zemdirbyste-Agriculture 105, no. 3: 249-256.
Darbe tirtas žieminių kviečių kokybinių rodiklių priklausomumas nuo tręšimo azoto trąšomis. Lauko eksperimentas vykdytas 2011–2012 m. Aleksandro Stulginskio universiteto Bandymų stotyje, karbonatingame sekliai glėjiškame išplautžemyje (Calc(ar)i-Epihypogleyic Luvisol). Vertintos labai geras kepamąsias savybes turinčios kviečių veislės: ‘Zentos’, ‘Ada’. Granuliuoto superfosfato (P60) ir kalio chlorido (K60) trąšos išbertos sėjos metu, o amonio salietra (N60) – pavasarį, atsinaujinus vegetacijai, krūmijimosi tarpsniu (BBCH 23–25). Papildomai per lapus tręšta karbamido tirpalu: (N30), (N40) – bamblėjimo (BBCH 34–36) ir (N15), (N30) – pieninės brandos (BBCH 71–74) tarpsniais. Nustatyta, kad azoto trąšų naudojimas bamblėjimo ir pieninės brandos tarpsniais veislių ‘Zentos’ ir ‘Ada’ kviečių grūdų baltymingumą pagerino vidutiniškai 2,20–1,76 proc. vnt., šlapiojo glitimo kiekį – 4,89–4,66 proc. vnt., sedimentacijos vertes – 12,58– 14,20 ml. Atlikta koreliacinė regresinė duomenų analizė patvirtino, kad kviečių grūdų kokybės rodikliai statistiškai patikimai koreliavo su azoto trąšų normomis. Koreliaciniai ryšiai gauti labai stiprūs (r = 0,902–0,922 ir r = 0,883–0,927).
Aistė Juchnevičienė; Ilona Vagusevičienė; Aušra Brazaitytė; Pavelas Duchovskis. Žiemini? kvie?i? gr?d? kokybini? rodikli? priklausomumas nuo tr?šimo azoto tr?šomis. Žemės ūkio mokslai 2016, 23, 1 .
AMA StyleAistė Juchnevičienė, Ilona Vagusevičienė, Aušra Brazaitytė, Pavelas Duchovskis. Žiemini? kvie?i? gr?d? kokybini? rodikli? priklausomumas nuo tr?šimo azoto tr?šomis. Žemės ūkio mokslai. 2016; 23 (2):1.
Chicago/Turabian StyleAistė Juchnevičienė; Ilona Vagusevičienė; Aušra Brazaitytė; Pavelas Duchovskis. 2016. "Žiemini? kvie?i? gr?d? kokybini? rodikli? priklausomumas nuo tr?šimo azoto tr?šomis." Žemės ūkio mokslai 23, no. 2: 1.
Jurga Miliauskienė; Sandra Sakalauskienė; Sigitas Lazauskas; Virmantas Povilaitis; Aušra Brazaitytė; Pavelas Duchovskis. The competition between winter rape (C3) and maize (C4) plants in response to elevated carbon dioxide and temperature, and drought stress Žieminių rapsų (C3) ir kukurūzų (C4) konkurencija esant didesnei anglies dioksido koncentracijai ir temperatūrai bei vandens trūkumui. Zemdirbyste-Agriculture 2016, 103, 21 -28.
AMA StyleJurga Miliauskienė, Sandra Sakalauskienė, Sigitas Lazauskas, Virmantas Povilaitis, Aušra Brazaitytė, Pavelas Duchovskis. The competition between winter rape (C3) and maize (C4) plants in response to elevated carbon dioxide and temperature, and drought stress Žieminių rapsų (C3) ir kukurūzų (C4) konkurencija esant didesnei anglies dioksido koncentracijai ir temperatūrai bei vandens trūkumui. Zemdirbyste-Agriculture. 2016; 103 (1):21-28.
Chicago/Turabian StyleJurga Miliauskienė; Sandra Sakalauskienė; Sigitas Lazauskas; Virmantas Povilaitis; Aušra Brazaitytė; Pavelas Duchovskis. 2016. "The competition between winter rape (C3) and maize (C4) plants in response to elevated carbon dioxide and temperature, and drought stress Žieminių rapsų (C3) ir kukurūzų (C4) konkurencija esant didesnei anglies dioksido koncentracijai ir temperatūrai bei vandens trūkumui." Zemdirbyste-Agriculture 103, no. 1: 21-28.
2014 m. LAMMC Sodininkystės ir daržininkystės instituto Augalų fiziologijos laboratorijoje atliktas tyrimas parenkant optimalų naujų puslaidininkinių lempų apšvietimo spektrą bei šviesos intensyvumo srautą siekiant išauginti kokybiškus pomidorų daigus (‘Cunero’ F1). Tyrimo metu atlikti atskiri eksperimentai uždaroje kontroliuojamo klimato kameroje (fitotrone) bei instituto daigyno šiltnamyje. Daigai apšviesti naujomis pramoninio naudojimo puslaidininkinėmis lempomis, sudarytomis iš violetinės 420–430 nm, mėlynos 460–470 nm, oranžinės 610– 615 nm, raudonos 620–630 nm ir 660–670 nm, baltos (mėlyna 400–500 nm + žalia 500–600 nm + raudona 600–700 nm) spalvos šviesą emituojančių diodų (LED). Eksperimentų metu palaikytas skirtingas fotosintetiškai aktyvios spinduliuotės (FAS) fotonų srauto tankis – ~150 ir ~250 µmol m–2 s–1. Nustatyta, kad pomidorų daigų apšvietimas naujais ir pramoniniam naudojimui pritaikytais LED šviestuvais turėjo teigiamos įtakos morfologiniams ir fitocheminiams rodikliams – stebėtas spartesnis augalų vystymasis bei pigmentų kaupimasis. Esant intensyvesnei LED spinduliuotei (~250 µmol m–2 s–1), pomidorų daigai gebėjo užauginti platesnius lapus, sukaupti daugiau žalios bei sausos masės. Apibendrinant abiejų eksperimentų rezultatus galima teigti, kad fotosintezės intensyvumui didžiausios teigiamos įtakos turėjo ~150 µmol m–2 s–1 LED skleidžiama šviesa.
Aistė Bagdonavičienė; Aušra Brazaitytė; Julė Jankauskienė; Viktorija Vaštakaitė; Pavelas Duchovskis. Pramoninių LED šviestuvų fotonų srauto tankio poveikis pomidorų daigams. Žemės ūkio mokslai 2015, 22, 1 .
AMA StyleAistė Bagdonavičienė, Aušra Brazaitytė, Julė Jankauskienė, Viktorija Vaštakaitė, Pavelas Duchovskis. Pramoninių LED šviestuvų fotonų srauto tankio poveikis pomidorų daigams. Žemės ūkio mokslai. 2015; 22 (2):1.
Chicago/Turabian StyleAistė Bagdonavičienė; Aušra Brazaitytė; Julė Jankauskienė; Viktorija Vaštakaitė; Pavelas Duchovskis. 2015. "Pramoninių LED šviestuvų fotonų srauto tankio poveikis pomidorų daigams." Žemės ūkio mokslai 22, no. 2: 1.
Tyrimai atlikti LAMMC Sodininkystės ir daržininkystės instituto Augalų fiziologijos laboratorijos fitotrono komplekse ir instituto daigyno šiltnamyje. Darbo tikslas – parinkti naujų puslaidininkinių lempų fotonų srauto tankį auginat agurkų daigus šiltnamiuose ir fitotrone. Tyrimams naudotas agurkų hibridas ‘Mandy’ F1. Švitinta LED lempomis, kurios sudarytos iš violetinės 420–430 nm, mėlynos 460– 470 nm, oranžinės 610–615 nm, raudonos 620–630 nm ir 660–670 nm, baltos (mėlyna 400–500 nm + žalia 500–600 nm + raudona 600–700 nm) spalvos šviesą emituojančių diodų. Eksperimentų metu palaikytas skirtingas fotosintetiškai aktyvios spinduliuotės (FAS) fotonų srauto tankis (PPFD) – ~150 ir ~250 µmol m–2 s–1. Šiltnamyje agurkų daigai auginti po puslaidininkinėmis lempomis natūralaus apšvietimo fone. Fitotrono kamerose agurkų daigams apšviesti naudotos tik puslaidininkinės lempos. Palyginamieji daigai auginti po aukšto slėgio natrio lempomis (SON-T Agro) (~150 µmol m–2 s–1). Atlikti apšvietimo tyrimai šiltnamyje ir fitotrone parodė, kad švitinimas naujomis puslaidininkinėmis lempomis turėjo teigiamos įtakos daigų biometriniams ir fitocheminiams rodikliams. Nustatyta, kad esant didesniam fotonų srauto tankiui daigai geba užauginti plačius lapus, sukaupti daugiau žalios ir sausos masės. Puslaidininkinių lempų šviesa skatino chlorofilų kaupimą daigų lapuose. Šiltnamyje labiausiai išsivystė daigai, augę po SON-T Agro lempomis. Techninės brandos tarpsniu jie pasiekė VI–VII organogenezės etapą. Fitotrone labiausiai išsivystė daigai, augę po puslaidininkinių lempų šviesa, jie pasiekė VI organogenezės etapą. Daigų fotosintezės intensyvumui didžiausios teigiamos įtakos turėjo ~150 µmol m–2 s–1 LED apšvietimo fotonų srauto tankis tiek šiltnamyje, tiek fitotrone.
Aistė Bagdonavičienė; Julė Jankauskienė; Aušra Brazaitytė; Viktorija Vaštakaitė; Pavelas Duchovskis. Pramoninių LED šviestuvų fotonų srauto tankio poveikis agurkų daigams. Žemės ūkio mokslai 2015, 22, 1 .
AMA StyleAistė Bagdonavičienė, Julė Jankauskienė, Aušra Brazaitytė, Viktorija Vaštakaitė, Pavelas Duchovskis. Pramoninių LED šviestuvų fotonų srauto tankio poveikis agurkų daigams. Žemės ūkio mokslai. 2015; 22 (1):1.
Chicago/Turabian StyleAistė Bagdonavičienė; Julė Jankauskienė; Aušra Brazaitytė; Viktorija Vaštakaitė; Pavelas Duchovskis. 2015. "Pramoninių LED šviestuvų fotonų srauto tankio poveikis agurkų daigams." Žemės ūkio mokslai 22, no. 1: 1.
The objective of this study was to evaluate the effects of irradiance levels and spectra produced by solid-state light-emitting diodes (LEDs) on carotenoid content and composition changes in Brassicaceae microgreens. A system of five high-power, solid-state lighting modules with standard 447-, 638-, 665-, and 731-nm LEDs was used in the experiments. Two experiments were performed: (1) evaluation of LED irradiance levels of 545, 440, 330, 220, and 110 μmol m(-2) s(-1) photosynthetically active flux density (PPFD) and (2) evaluation of the effects of 520-, 595-, and 622-nm LEDs supplemental to the standard set of LEDs. Concentrations of various carotenoids in red pak choi and tatsoi were higher under illumination of 330-440 μmol m(-2) s(-1) and at 110-220 μmol m(-2) s(-1) in mustard. All supplemental wavelengths increased total carotenoid content in mustard but decreased it in red pak choi. Carotenoid content increased in tatsoi under supplemental yellow light.
Aušra Brazaitytė; Sandra Sakalauskienė; Giedrė Samuolienė; Julė Jankauskienė; Akvilė Viršilė; Algirdas Novičkovas; Ramūnas Sirtautas; Jurga Miliauskienė; Viktorija Vaštakaitė-Kairienė; Laurynas Dabašinskas; Pavelas Duchovskis. The effects of LED illumination spectra and intensity on carotenoid content in Brassicaceae microgreens. Food Chemistry 2015, 173, 600 -606.
AMA StyleAušra Brazaitytė, Sandra Sakalauskienė, Giedrė Samuolienė, Julė Jankauskienė, Akvilė Viršilė, Algirdas Novičkovas, Ramūnas Sirtautas, Jurga Miliauskienė, Viktorija Vaštakaitė-Kairienė, Laurynas Dabašinskas, Pavelas Duchovskis. The effects of LED illumination spectra and intensity on carotenoid content in Brassicaceae microgreens. Food Chemistry. 2015; 173 ():600-606.
Chicago/Turabian StyleAušra Brazaitytė; Sandra Sakalauskienė; Giedrė Samuolienė; Julė Jankauskienė; Akvilė Viršilė; Algirdas Novičkovas; Ramūnas Sirtautas; Jurga Miliauskienė; Viktorija Vaštakaitė-Kairienė; Laurynas Dabašinskas; Pavelas Duchovskis. 2015. "The effects of LED illumination spectra and intensity on carotenoid content in Brassicaceae microgreens." Food Chemistry 173, no. : 600-606.
Julė Jankauskienė; Aušra Brazaitytė; Pranas Viškelis. Effect of Different Growing Substrates on Physiological Processes, Productivity and Quality of Tomato in Soilless Culture. Soilless Culture - Use of Substrates for the Production of Quality Horticultural Crops 2015, 1 .
AMA StyleJulė Jankauskienė, Aušra Brazaitytė, Pranas Viškelis. Effect of Different Growing Substrates on Physiological Processes, Productivity and Quality of Tomato in Soilless Culture. Soilless Culture - Use of Substrates for the Production of Quality Horticultural Crops. 2015; ():1.
Chicago/Turabian StyleJulė Jankauskienė; Aušra Brazaitytė; Pranas Viškelis. 2015. "Effect of Different Growing Substrates on Physiological Processes, Productivity and Quality of Tomato in Soilless Culture." Soilless Culture - Use of Substrates for the Production of Quality Horticultural Crops , no. : 1.
BACKGROUND: The effects of short‐term ultraviolet B (UV‐B) irradiation on sweet basil (Ocimum basilicum L. cv. Cinnamon) plants at the 3–4 leaf pair and flowering stages were examined in controlled environment growth chambers. Plants were exposed to 0 (reference), 2 and 4 kJ UV‐B m−2 day−1 over 7 days. RESULTS: Exposure of basil plants to supplementary UV‐B light resulted in increased assimilating leaf area, fresh biomass and dry biomass. Stimulation of physiological functions in young basil plants under either applied UV‐B dose resulted in increased total chlorophyll content but no marked variation in carotenoid content. At the flowering stage the chlorophyll and carotenoid contents of basil were affected by supplementary UV‐B radiation, decreasing with enhanced UV‐B exposure. Both total antioxidant activity (2,2‐diphenyl‐1‐picrylhydrazyl free radical assay) and total phenolic compound content were increased by UV‐B light supplementation. Young and mature basil plants differed in their ascorbic acid content, which was dependent on UV‐B dose and plant age. UV‐B radiation resulted in decreased nitrate content in young basil plants (3–4 leaf pair stage). CONCLUSION: These results indicate that the application of short‐exposure UV‐B radiation beneficially influenced both growth parameters and biochemical constituents in young and mature basil plants. © 2012 Society of Chemical Industry
Jurga Sakalauskaitė; Pranas Viskelis; Edita Dambrauskienė; Sandra Sakalauskienė; Giedrė Samuolienė; Aušra Brazaitytė; Pavelas Duchovskis; Dalia Urbonavičienė. The effects of different UV-B radiation intensities on morphological and biochemical characteristics inOcimum basilicumL. Journal of the Science of Food and Agriculture 2012, 93, 1266 -1271.
AMA StyleJurga Sakalauskaitė, Pranas Viskelis, Edita Dambrauskienė, Sandra Sakalauskienė, Giedrė Samuolienė, Aušra Brazaitytė, Pavelas Duchovskis, Dalia Urbonavičienė. The effects of different UV-B radiation intensities on morphological and biochemical characteristics inOcimum basilicumL. Journal of the Science of Food and Agriculture. 2012; 93 (6):1266-1271.
Chicago/Turabian StyleJurga Sakalauskaitė; Pranas Viskelis; Edita Dambrauskienė; Sandra Sakalauskienė; Giedrė Samuolienė; Aušra Brazaitytė; Pavelas Duchovskis; Dalia Urbonavičienė. 2012. "The effects of different UV-B radiation intensities on morphological and biochemical characteristics inOcimum basilicumL." Journal of the Science of Food and Agriculture 93, no. 6: 1266-1271.
We report on high-power solid-state lighting facility for cultivation of greenhouse vegetables and on the results of the study of control of photosynthetic activity and growth morphology of radish and lettuce imposed by variation of the spectral composition of illumination. Experimental lighting modules (useful area of 0.22 m2) were designed based on 4 types of high-power light-emitting diodes (LEDs) with emission peaked in red at the wavelengths of 660 nm and 640 nm (predominantly absorbed by chlorophyll a and b for photosynthesis, respectively), in blue at 455 nm (phototropic function), and in far-red at 735 nm (important for photomorphology). Morphological characteristics, chlorophyll and phytohormone concentrations in radish and lettuce grown in phytotron chambers under lighting with different spectral composition of the LED-based illuminator and under illumination by high pressure sodium lamps with an equivalent photosynthetic photon flux density were compared. A well-balanced solid-state lighting was found to enhance production of green mass and to ensure healthy morphogenesis of plants compared to those grown using conventional lighting. We observed that the plant morphology and concentrations of morphologically active phytohormones is strongly affected by the spectral composition of light in the red region. Commercial application of the LED-based illumination for large-scale plant cultivation is discussed. This technology is favorable from the point of view of energy consumption, controllable growth, and food safety but is hindered by high cost of the LEDs. Large scale manufacturing of high-power red AlInGaP-based LEDs emitting at 650 nm and a further decrease of the photon price for the LEDs emitting in the vicinity of the absorption peak of chlorophylls have to be achieved to promote horticulture applications.
Gintautas Tamulaitis; Pavelas Duchovskis; Zenius Bliznikas; Kestutis Breive; Raimonda Ulinskaite; Aušra Brazaitytė; Algirdas Novičkovas; Artūras Žukauskas; Michael S. Shur. High-power LEDs for plant cultivation. Fourth International Conference on Solid State Lighting 2004, 5530, 165 -174.
AMA StyleGintautas Tamulaitis, Pavelas Duchovskis, Zenius Bliznikas, Kestutis Breive, Raimonda Ulinskaite, Aušra Brazaitytė, Algirdas Novičkovas, Artūras Žukauskas, Michael S. Shur. High-power LEDs for plant cultivation. Fourth International Conference on Solid State Lighting. 2004; 5530 ():165-174.
Chicago/Turabian StyleGintautas Tamulaitis; Pavelas Duchovskis; Zenius Bliznikas; Kestutis Breive; Raimonda Ulinskaite; Aušra Brazaitytė; Algirdas Novičkovas; Artūras Žukauskas; Michael S. Shur. 2004. "High-power LEDs for plant cultivation." Fourth International Conference on Solid State Lighting 5530, no. : 165-174.