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Cultivation of sweet pepper (Capsicum annuum L.) transplants under high pressure sodium lamps supplemented by light-emitting diodes of various wavelengths

100%

Bagdonaviciene A., Brazaityte A., Virsile A., Samuoliene G., Jankauskiene J., Sirtautas R., Sakalauskiene S., Miliauskiene J., Marockiene N., Duchovskis P.

Acta Scientiarum Polonorum. Hortorum Cultus

2015

tom 14

nr 6

In greenhouses, artificial lighting is applied in winter and early spring as sup-plementary light source to increase photosynthesis and plant growth. The objective of this study was to evaluate the cultivation of sweet pepper transplants under LED lamps that were developed to supplement HPS lamps used in greenhouses. The experiments were carried out in the greenhouses at the Lithuanian Research Centre for Agriculture and For-estry Institute of Horticulture. Sweet peppers (Capsicum annuum) L. cultivar ‘Reda’ and the hybrid ‘Figaro’ F1 were used for investigation. Four types of solid-state lamps were used with light-emitting diodes (LEDs) with peak emissions at blue 455 nm and 470 nm, cyan 505 nm, and green 530 nm. PPFD of each type of LED lamp was 15 μmol m-2 s-1, and the PPFD of HPS lamps was 90 μmol m-2 s-1. The reference transplants were grown under the illumination of HPS lamps (110 μmol m-2 s-1). The photoperiod of artificial lighting was maintained at 18 hours. Our experiments revealed different responses to sup-plemental LED lightings between the cultivar and the hybrid. The supplemental 470 nm illumination with HPS lamps mostly resulted in increases in the following areas: leaf area, fresh and dry weight, and the photosynthetic pigment content of the sweet pepper ‘Reda’ transplants. A similar positive effect was determined using supplemental 455 and 505 nm LED lights. However, the supplemental green 530 nm LED lights had no effect on growth, and they inhibited the development of the sweet pepper ‘Reda’ transplants. The HPS light had a positive effect on the growth parameters of the ‘Figaro’ F1 transplants, but all of the supplemental LED lights suppressed their growth and development

Effect of supplemental UV-A irradiation in solid-state lighting on the growth and phytochemical content of microgreens

81%

Brazaityte A., Virsile A., Jankauskiene J., Sakalauskiene S., Samuoliene G., Sirtautas R., Novickovas A., Dabasinskas L., Miliauskiene J., Vastakaite V., Bagdonaviciene A., Duchovskis P.

International Agrophysics

2015

tom 29

nr 1

In this study, we sought to find and employ positive effects of UV-A irradiation on cultivation and quality of microgreens. Therefore, the goal of our study was to investigate the influence of 366, 390, and 402 nm UV-A LED wavelengths, supplemental for the basal solid-state lighting system at two UV-A irradiation levels on the growth and phytochemical contents of different microgreen plants. Depending on the species, supplemental UV-A irradiation can improve antioxidant properties of microgreens. In many cases, a significant increase in the investigated phytochemicals was found under 366 and 390 nm UV-A wavelengths at the photon flux density (12.4 μmol m-2 s-1). The most pronounced effect of supplemental UV-A irradiation was detected in pak choi microgreens. Almost all supplemental UV-A irradiation treatments resulted in increased leaf area and fresh weight, in higher 2,2–diphenyl–1–picrylhydrazyl free-radical scavenging activity, total phenols, anthocyanins, ascorbic acid, and α-tocopherol.

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Hortorum Cultus

1 International Agrophysics

2 Bagdonaviciene A.

2 Brazaityte A.

2 Duchovskis P.

2 Jankauskiene J.

2 Miliauskiene J.

2 Sakalauskiene S.

2 Samuoliene G.

2 Sirtautas R.

2 Virsile A.

1 Dabasinskas L.

1 Marockiene N.

1 Novickovas A.

1 Vastakaite V.

2 2015

Wyniki wyszukiwania

Cultivation of sweet pepper (Capsicum annuum L.) transplants under high pressure sodium lamps supplemented by light-emitting diodes of various wavelengths

Effect of supplemental UV-A irradiation in solid-state lighting on the growth and phytochemical content of microgreens