Abstract
BackgroundIn this study, we observed their growth and physiological responses using a variety of duty ratio under the mixed light using red, blue, and white lights. The red+blue mixed light was treated with 95%, 90%, 85%, 80%, and 75% duty ratios and red+blue+white mixed light with 85% and 70% duty ratios. We examined the width and length of leaves, total number of leaves, and number of shoots to examine their growth responses. The physiological responses were studied by measuring their photosynthetic rate, transpiration rate, stomatal conductance, water use efficiency, chlorophyll content, and fluorescence (Fo, Fm, and Fv/Fm).ResultsWe found that lower duty ratio caused the length and width of the leaves to grow longer under red+blue mixed light but that it did not cause any difference in the red+blue+white mixed light condition. In addition, there was no difference in the number of leaves and shoots among all treatments. In the red+blue mixed light condition, the photosynthetic rate was no difference, but both transpiration rate and stomatal conductance were the highest at 95% duty ratio than in other ratios. Water use efficiency pattern was similar to that of photosynthetic rate; water use efficiency was no difference. Chlorophyll content was the highest at 95% duty ratios, and it was the least at 90%, 85%, and 75% duty ratio. Fo and Fm values were relatively high at 85% and 80% duty ratio and low at 90% duty ratio while Fv/Fm showed no difference.ConclusionsUnder the red+blue+white mixed light, all physiological items showed no difference between 70 and 85% treatments. But, photosynthetic rate, water use efficiency, chlorophyll content, and Fv/Fm were relatively greater in the red+blue+white mixed light than in the red+blue mixed light. Therefore, red+blue+white mixed light treated with 70% duty ratio could lessen the environmental stress and save more power when cultivating Silene capitata in a plant factory.
Highlights
In this study, we observed their growth and physiological responses using a variety of duty ratio under the mixed light using red, blue, and white lights
We investigated that S. capitata is grown well in a plant factory that affected on proliferation and production of plants and not affected on the external environment
In the red+blue mixed light (R+B) condition, the leaf length was longest at 80% Duty ratio (DR) and the shortest at 95% DR
Summary
We observed their growth and physiological responses using a variety of duty ratio under the mixed light using red, blue, and white lights. A global issue, increased the global annual temperature by 0.85 °C from 1880 to 2012 and the average global sea level by 19 cm from 1901 to 2010 (Ministry of Environment 2017). The increasing pattern of annual temperature and sea level is observed in Korea as well. The annual temperature in Korea increased by 0.23 °C per decade from 1954 to 1999, 0.41 °C per decade from 1981 to 2010, and 0.5 °C per decade from 2001 to 2010 (Ministry of Environment 2017). These environmental changes can lead to an extreme weather conditions (Houghton et al 2001), and it is estimated that such change in the weather could reduce the biodiversity in Asia, including the Korean Peninsula, and cause a great deal of environmental impacts such as diseases and floods
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