Effects of Supplementary Blue and UV-A LED Lights on Morphology and Phytochemicals of Brassicaceae Baby-Leaves

Yamin Li,Dongqiang Zheng,Houcheng Liu,Shiwei Song,Yinjian Zheng,Wei Su,Yiting Zhang

doi:10.3390/molecules25235678

Yamin Li, Dongqiang Zheng + Show 5 more

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https://doi.org/10.3390/molecules25235678

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Abstract

Brassicaceae baby-leaves are good source of functional phytochemicals. To investigate how Chinese kale and pak-choi baby-leaves in response to different wavebands of blue (430 nm and 465 nm) and UV-A (380 nm and 400 nm) LED, the plant growth, glucosinolates, antioxidants, and minerals were determined. Both agronomy traits and phytochemical contents were significantly affected. Blue and UV-A light played a predominant role in increasing the plant biomass and morphology, as well as the contents of antioxidant compounds (vitamin C, vitamin E, phenolics, and individual flavonols), the antioxidant activity (DPPH and FRAP), and the total glucosinolates accumulation. In particular, four light wavebands significantly decreased the content of progoitrin, while 400 nm UV-A light and 430 nm blue light were efficient in elevating the contents of sinigrin and glucobrassicin in Chinese kale. Meanwhile, 400 nm UV-A light was able to increase the contents of glucoraphanin, sinigrin, and glucobrassicin in pak-choi. From the global view of heatmap, blue lights were more efficient in increasing the yield and phytochemical levels of two baby-leaves.

Highlights

Chinese kale (Brassica alboglabra Bailey) and pak-choi (Brassica campestris L. ssp. chinensis var. communis) are native to China, distributing widely in South China and Southeast Asia.These Brassicaceous vegetables are famous due to their rich contents of phytonutrients, including sulphoraphane, anthocyanins, glucosinolates (GLs), carotenoids, flavonoids and general antioxidants.Baby-leaves are harvested from vegetable or herb seedlings, with three to five true leaves.Considerable evidence indicated the health and nutritional benefits associated with the consumption of fresh-cut baby-leaves [1]
The highest plant height, the largest leaf length and leaf width were observed in T430 and/or the wavelengths of 465 nm (T465), followed by T380 and T400 (Figure 1c–e), which in turn contributed to the increase in biomass
Compared to CK, the fresh weight of Chinese kale and pak-choi were highly promoted by T430 (62.22, 73.79%) and T465 (60.08, 83.47%), followed by T380 (58.21, 22.38%) and T400 (34.42, 26.01%)

Summary

Introduction

Chinese kale (Brassica alboglabra Bailey) and pak-choi (Brassica campestris L. ssp. chinensis var. communis) are native to China, distributing widely in South China and Southeast Asia.These Brassicaceous vegetables are famous due to their rich contents of phytonutrients, including sulphoraphane, anthocyanins, glucosinolates (GLs), carotenoids, flavonoids and general antioxidants.Baby-leaves are harvested from vegetable or herb seedlings, with three to five true leaves.Considerable evidence indicated the health and nutritional benefits associated with the consumption of fresh-cut baby-leaves [1]. Communis) are native to China, distributing widely in South China and Southeast Asia. Chinese kale (Brassica alboglabra Bailey) and pak-choi These Brassicaceous vegetables are famous due to their rich contents of phytonutrients, including sulphoraphane, anthocyanins, glucosinolates (GLs), carotenoids, flavonoids and general antioxidants. Baby-leaves are harvested from vegetable or herb seedlings, with three to five true leaves. Considerable evidence indicated the health and nutritional benefits associated with the consumption of fresh-cut baby-leaves [1]. The younger plants have excellent flavor and higher nutritional abundance than the mature ones, the products of Chinese kale and pak-choi baby-leaves have become popular in the market. Carotenoids are mainly responsible for the yellow to red colors in plants [8], which function as the light-harvesting pigments in chloroplasts [9,10] and commercially

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