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손기호,Mizuki Ide,Eiji Goto 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.2
We determined the eff ects of UV radiation and low root zone temperature on growth characteristics and phytochemicalsof Brassica napus (canola) cultivated in a controlled environment (25/20 °C 16/8 [light/dark]; 70% relative humidity;1000 μmol mol −1 CO 2 with photosynthetic photon fl ux density of 100 and 200 μmol m −2 s −1 for 7 and 18 days, respectively). The 18-day-old B. napus plants were treated for 5 days with two nutrient solution–temperature regimes (normal temperature[NT] and low-temperature [10 °C; LT]) and three levels of UV radiation (0, 0.3, and 0.6 W m −2 ). Treatment with 0.6 W m −2UV decreased quantum effi ciency of photosystem II the most. Most growth characteristics decreased under LT + UV treatments. Treatments with 0.6 W m −2 UV, compared to those without UV, signifi cantly inhibited shoot height. LT + 0.3 and+0.6 UV decreased shoot height the most. Temperature (T) × UV interaction did not aff ect most growth characteristics exceptleaf area, specifi c leaf weight, and shoot water content. Antioxidant capacity (total ORAC) resembled lipophilic ORAC andshowed the highest value in the LT + 0.6 UV treatment. T × UV interaction did not aff ect ORAC values, although LT +0.3 UV and LT + 0.6 UV treatments produced the highest values. Both LT and UV radiation enhanced the total phenoliccontent, and in the combined treatments, it was two times that of the control. UV intensities (0.3 and 0.6 W m −2 ) remainedconstant regardless of variation in root zone temperature. UV radiation enhanced total fl avonoid content equally across differentintensities; LT + 0.6 W m −2 UV treatment produced a relatively high value. Thus, LT and UV negatively aff ected plantgrowth parameters, except total dry weight, whereas LT, UV, or LT + UV positively aff ected antioxidant properties, totalphenolics, and fl avonoids, suggesting the potential of using an LT treatment in a hydroponic system as well as UV radiationto enhance growth performance of greenhouse and factory plants.