Methods: The effect of LTR on photosynthesis rate, growth, and ginsenoside content of ginseng was
examined by growing ginseng at the greenhouse under 6%, 9%, 13%, and 17% of LTR.
Results: The light-saturated net photosynthesis rate (Asat) and stomatal conductance (gs) of ginseng
increased until the LTR reached 17% in the early stage of growth, whereas they dropped sharply owing to
excessive leaf chlorosis at 17% LTR during the hottest summer period in August. Overall, 6e17% of LTR had
no effect on the aerial part of plant length or diameter, whereas 17% and 13% of LRT induced the largest
leaf area and the highest root weight, respectively. The total ginsenoside content of the ginseng leaves
increased as the LTR increased, and the overall content of protopanaxatriol line ginsenosides was higher
than that of protopanaxadiol line ginsenosides. The ginsenoside content of the ginseng roots also
increased as the LTR increased, and the total ginsenoside content of ginseng grown at 17% LTR increased
by 49.7% and 68.3% more than the ginseng grown at 6% LTR in August and final harvest, respectively.
Methods: The effect of LTR on photosynthesis rate, growth, and ginsenoside content of ginseng wasexamined by growing ginseng at the greenhouse under 6%, 9%, 13%, and 17% of LTR.Results: The light-saturated net photosynthesis rate (Asat) and stomatal conductance (gs) of ginsengincreased until the LTR reached 17% in the early stage of growth, whereas they dropped sharply owing toexcessive leaf chlorosis at 17% LTR during the hottest summer period in August. Overall, 6e17% of LTR hadno effect on the aerial part of plant length or diameter, whereas 17% and 13% of LRT induced the largestleaf area and the highest root weight, respectively. The total ginsenoside content of the ginseng leavesincreased as the LTR increased, and the overall content of protopanaxatriol line ginsenosides was higherthan that of protopanaxadiol line ginsenosides. The ginsenoside content of the ginseng roots alsoincreased as the LTR increased, and the total ginsenoside content of ginseng grown at 17% LTR increasedby 49.7% and 68.3% more than the ginseng grown at 6% LTR in August and final harvest, respectively.
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