Abstract
Victory onion (Allium victorialis) is an edible vegetation that has significant value as a non-structural carbohydrate and secondary metabolite supplier. Easily measured leaf variables will be useful to predict for the flexible adjustment of physiochemical parameters in a cultural regime in plant factory conditions. Red, green, and blue light-emitting diode (LED) spectra were used to culture victory onion sprouts. Compared to the green-light spectrum, the red-light spectrum promoted leaf width and area, specific leaf area, and dry mass, water content, fine root growth, and starch accumulation in shoots, but lowered concentrations of total flavonoids and saponins. Sprouts had their shoots cut, but there were limited interactive effects with light spectra on most variables. In general, shoot-cutting depressed growth of leaf morphology, shoot weight, water content, and soluble sugar content, but enhanced accumulation of secondary metabolites. We did not find any relationship between leaf variables and secondary metabolites. Instead, wider leaves with a larger area generally had greater dry mass, water content, and soluble sugar accumulation. Leaves with deeper green colours generally had the opposite effects.
Highlights
Increasing human population and environmental contamination hasten the use of plant factory for vegetative production (Fedoroff and Cohen, 1999; Li et al, 2021; Wei et al, 2020)
Sprouts subjected to the blue- and red-light spectra had lower total flavonoids and saponins content compared to those subjected to the green-light spectrum (Figure 4E, G)
Sprouts subjected to the red-light spectrum generally had increased leaf morphology, shoot growth, dry weight mass, fine root growth, and starch accumulation, but decreased secondary metabolites compared to those subjected to the green-light spectrum
Summary
Increasing human population and environmental contamination hasten the use of plant factory for vegetative production (Fedoroff and Cohen, 1999; Li et al, 2021; Wei et al, 2020). Light is one of the most limiting factors for plant growth and quality. The adjustment of spectrum promotes crop yield ( Saito et al, 2020; Carotti et al, 2021), and boosts production of officinal ingredients in medicinal plants ( Wei et al, 2020; Feldzensztajn et al, 2021). The specific illumination condition established for medicinal plants depends on how it affects the production of secondary metabolites. Determining medicinal ingredients is a hard task due to heavy dependences on reagents, equipment, laboratory, and operational
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