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Supplementary Light Source Affects the Growth and Development of Codonopsis lanceolata Seedlings

Authors Ren, Xiuxia; Liu, Ya; Jeong, Hai Kyoung; Jeong, Byoung Ryong

Journal INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES , OCT 2018,10:19

DOI 10.3390/ijms19103074 PubMed 30297684

Abstract Codonopsis lanceolata is widely used in traditional medicine and diets. However, there is no optimal protocol for the commercial production of C. lanceolata seedlings. This study was carried out to find the optimum supplementary light source for the production of C. lanceolata seedlings. Seedlings were grown for four weeks in a glasshouse with an average daily light intensity of 490 mol m(-2)s(-1) photosynthetic photon flux density (PPFD) coming from the sun and a 16-h daily supplementary lighting at 120 mol m(-2)s(-1) PPFD from either high-pressure sodium (HPS), metal halide (MH), far-red (FR), white LED (LED-w), or mixed (white: red: blue = 1:2:1) LEDs (LED-mix). The results showed that the greatest total biomass, stem diameter, ratio of shoot weight to shoot length, root biomass, and ratio of root weight to shoot weight were found in seedlings grown under supplementary LED-mix. Meanwhile, the stomatal properties and soluble sugar contents were improved for seedlings in LED-mix. The contents of starch, total phenols, and flavonoids were the greatest for seedlings in LED-w and LED-mix. The expression of photosynthetic proteins and genes in seedlings was also enhanced by LED-mix. Overall, these results suggest that LED-mix is advantageous to the photosynthetic potential and the accumulation of biomass, carbohydrates and secondary metabolites in C. lanceolata.

Species covered 羊乳 Codonopsis lanceolata