Temperature Effects on the Photosynthesis by the Medicinal Plant Pinellia ternata Breit

In our previous report, we had shown that the Kyoto line of the medicinal plant Pinellia ternata Breit. had the highest yield and effective ingredient content at a growth temperature of 25 ̊C (Eguchi et al., 2019). The Nagasaki line, however, did not show growth response at a temperature of 25 ̊C. We also investigated the effects of temperature on the growth and quality of the Fukushima and Okinawa lines (Eguchi et al., 2016); there was no obvious response to the growth temperature. Higher leaf photosynthetic capacity has been reported to contribute to higher yields in some crops (Jiang et al., 1988; Fischer et al., 1998; Higashide and Heuvelink, 2009; Takai et al., 2013). Therefore, we examined the temperature effects on the photosynthetic rate of the Kyoto, Nagasaki, and Okinawa lines.