Impact of Rising Global Temperatures on Growth, Mineral Composition, and Photosynthesis in Radish in a Winter Cropping System
2017
Oh, S., National Institute of Horticultural and Herbal Science, Jeju, Republic of Korea | Moon, K.H., National Institute of Horticultural and Herbal Science, Jeju, Republic of Korea | Song, E.Y., National Institute of Horticultural and Herbal Science, Jeju, Republic of Korea | Son, I.C., National Institute of Horticultural and Herbal Science, Jeju, Republic of Korea | Wi, S.H., National Institute of Horticultural and Herbal Science, Jeju, Republic of Korea | Koh, S.C., Jeju National University, Jeju, Republic of Korea
We investigated the effects of rising temperatures on the photosynthesis, mineral composition, and growth of radish (Raphanus sativus var. hortensis) in a winter cropping system using a temperature gradient tunnel to predict the impact of rising global temperatures. Vegetative growth, including shoot and root fresh and dry weights, shoot length, and root length and diameter, was high under elevated temperatures (ambient +4°C and +7°C) compared with ambient temperature. At elevated temperatures, the N, P, Ca, Mg, and Fe contents were high in shoots, whereas in roots, the K, Ca, Mg, and Fe contents were high and the Cu content was low. The maximum photosynthetic rates (22.1 μmolㆍm-² ㆍs-¹ at ambient temperature +4°C and 22.9 μmolㆍm-² ㆍs-¹ at ambient temperature +7°C) at elevated temperatures were more than twice that (9.7 μmolㆍm-² ㆍs-¹) at ambient temperature, whereas the water use efficiency was lower at elevated temperatures. These results suggest that rising global temperatures will lead to increased mineral absorption and photosynthesis in radish in winter cropping systems, subsequently favoring plant growth, although the water requirements will be high.
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