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Ren, Xiuxia,Liu, Ya,Jeong, Hai Kyoung,Jeong, Byoung Ryong MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.10
<P><I>Codonopsis lanceolata</I> is widely used in traditional medicine and diets. However, there is no optimal protocol for the commercial production of <I>C. lanceolata</I> seedlings. This study was carried out to find the optimum supplementary light source for the production of <I>C. lanceolata</I> seedlings. Seedlings were grown for four weeks in a glasshouse with an average daily light intensity of 490 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP> photosynthetic photon flux density (PPFD) coming from the sun and a 16-h daily supplementary lighting at 120 μmol·m<SUP>−2</SUP>·s<SUP>−1</SUP> 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 <I>C. lanceolata</I>.</P>
Callus induction and browning suppression in tree peony Paeonia ostii ‘Fengdan’
Xiuxia Ren,Ya Liu,ByoungRyongJeong 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.3
Callus induction is an important stage in micropropagation. In this study, embryos, cotyledons, and hypocotyls of treepeony ( Paeonia ostii ‘Fengdan’) were used as explants to induce callus formation. Callus induction was largely infl uencedby the medium, plant growth regulator, and explant. All combinations of the medium and plant growth regulator wereconducive to callus induction from zygotic embryos, where the ratio of explants with callus induction was very high in allof the combinations. The greatest ratio of explants with callus induction from the cotyledon explants was found on WoodyPlant Medium (WPM) or Murashige and Skoog (MS) medium supplemented with both 0.5 mg L −1 thidiazuron (TDZ)and either 0.5 mg L −1 2,4-dichlorophenoxyacetic acid (2,4-D) or 0.5 mg L −1 1-naphthaleneacetic acid (NAA), and on theWPM containing 0.5 mg L −1 NAA and 0.5 mg L −1 6-benzylaminopurine (BA). The ratio of explants with callus inducedfrom the hypocotyl explants was the greatest on either MS medium or WPM supplemented with both 0.5 mg L −1 2,4-D and0.5 mg L −1 TDZ. In contrast, a combination of 0.5 mg L −1 2,4-D and 0.5 mg L −1 TDZ, or 0.5 mg L −1 NAA and 0.5 mg L −1TDZ was highly likely to cause a browning problem during culture. For browning suppression, calcium chloride (CaCl 2 ),polyvinyl pyrrolidone (PVP), gallic acid, and caff eic acid were much more eff ective than other reagents. The effi cacy onbrowning suppression was concentration-dependent, and the best results were obtained at a concentration of 4.0 mg L −1CaCl 2 , 1.0–2.0 g L −1 PVP, 0.5–1.0 mg L −1 gallic acid, and 0.5–1.0 mg L −1 caff eic acid, respectively. In summary, callusformation was successfully induced from the zygotic embryo, cotyledon, and hypocotyl explants, and callus browning waseff ectively suppressed by caff eic acid (0.5–1.0 mg L −1 ), gallic acid (1.0 mg L −1 ), CaCl 2 (4.0 mg L −1 ), and PVP (1.0 g L −1 ).