Abstract
Plant production in a plant factory is an innovative and smart idea to grow food anytime, anywhere, regardless of the outer environment. However, potato pre-basic seed tuber (PBST) production in a plant factory is a comparatively new initiative. Therefore, the aim of this study was to optimize the artificial LED light spectrum to produce PBST in a plant factory. Two potato varieties such as Golden king (V48) and Chungang (V41) were grown in soil substrate under different combination of artificial LED light combinations (such as red+blue+far-red, red+blue+white, blue+far-red, blue+white, red+far-red, and red+white) maintaining photosynthetic photon flux density (PPFD) of 100 mol m−2s−1, temperature 23/15 °C (day/night), and relative humidity 70%. The study revealed that, overall, potato plant growth (viz.; plant height, node number, leaf number, leaf length and width, fresh and dry weight) was enhanced by the red+far red light for both potato varieties. The total seed tuber number per plant was higher in red+blue+white light for V48, and red+far-red for V41. The fresh tuber weight was the highest in the red+blue+far-red light for V48 and red+blue+white for V41. The highest accumulated photosynthetic pigment (total Chlorophyll, Chlorophyll a, b and Carotenoid) was observed in red+blue+white light for both varieties. The total carbohydrate content and total sucrose content were higher in red+blue+far red and red +far red light treatment for V48 and V41, respectively. Finally, considering all factors, it is concluded that the red+blue+white light combination is deemed to be appropriate for the potato PBST production in plant factory conditions.
Highlights
The early generation of pre-basic seed potatoes or potato mini tubers is mostly produced in soilless and substrate culture from in vitro potato plantlets or micro tubers in aseptic culture conditions
The study shows that L5 treatment has an overall positive effect on the growth characteristics for both cultivars among the artificial light combination
[28] Overall, the consequence of this study demonstrated that the combined spectrum of red, blue, and white had a significant effect on stem elongation, which turned into the tuber
Summary
The early generation of pre-basic seed potatoes or potato mini tubers is mostly produced in soilless and substrate culture from in vitro potato plantlets or micro tubers in aseptic culture conditions. Potato seed tubers are produced at high densities in the greenhouse using different substrates and open fields. Plant production in controlled environments/plant factories is a well-established agricultural production system for leafy vegetables, microgreens, fruits, and other crop species [5]. Potato seed tubers/pre-basic seed tuber production in a plant factory is a comparatively new idea where seed tuber can be produced year-round ignoring the external environment. The plant food production is transferred to a technically optimized building envelope allowing high productivity and assuring good food quality under regulated growing conditions without seasonal interruptions. Light regulates plant growth and development, and it directly influences plant photosynthesis resulting in increased carbohydrate and total biomass and ultimate production [6]
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