Effect of Pre-Harvest Supplemental UV-A/Blue and Red/Blue LED Lighting on Lettuce Growth and Nutritional Quality

Horticulturae

Joseph Masabni¹  Triston Hooks²  Ling Sun²  Genhua Niu² 

[1] Texas A&M AgriLife Extension, 17360 Coit Rd, Dallas, TX 75252, USA;Texas A&M AgriLife Research Center, 17360 Coit Rd, Dallas, TX 75252, USA;

关键词: anthocyanins;    carotenoids;    hydroponics;    phenolic compounds;    phytonutrients;    light quality;   

DOI  :  10.3390/horticulturae7040080

来源: DOAJ

【 摘 要 】

Blue light and ultra-violet (UV) light have been shown to influence plant growth, morphology, and quality. In this study, we investigated the effects of pre-harvest supplemental lighting using UV-A and blue (UV-A/Blue) light and red and blue (RB) light on growth and nutritional quality of lettuce grown hydroponically in two greenhouse experiments. The RB spectrum was applied pre-harvest for two days or nights, while the UV-A/Blue spectrum was applied pre-harvest for two or four days or nights. All pre-harvest supplemental lighting treatments had a same duration of 12 h with a photon flux density (PFD) of 171 μmol m⁻² s⁻¹. Results of both experiments showed that pre-harvest supplemental lighting using UV A/Blue or RB light can increase the growth and nutritional quality of lettuce grown hydroponically. The enhancement of lettuce growth and nutritional quality by the pre-harvest supplemental lighting was more effective under low daily light integral (DLI) compared to a high DLI and tended to be more effective when applied during the night, regardless of spectrum.

【 授权许可】

Unknown