Impact of Elevated Temperature in Growing Season on Growth and Bulb Development of Extremely Early-Maturing Onion (Allium cepa L. cv. Singsingball)
2017
Song, E.Y., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Moon, K.H., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Wi, S.H., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Kim, C.H., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Lim, C.K., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Oh, S., Research Institute of Climate Change and Agriculture, NIHHS, RDA, Jeju, Republic of Korea | Son, I.C., Planning and Coordination Division, NIHHS, RDA, Wanju, Republic of Korea
This study was conducted to determine the impact of elevated temperature based on climate change scenario on growth and bulb quality of extremely early-maturing onion (Allium cepa L. cv. Singsingball) in the temperature gradient tunnels. There were treated with 3 groups, one is a control group (ambient temperature, mean temperature at 9.8℃), another ambient temperature +2℃ (mean temperature at 12.0℃), and the other ambient temperature +5℃ (mean temperature at 14.3℃). Compared with the control, plant height, neck diameter, leaf area, top fresh weight and dry weight were significantly increased at ambient +2℃ temperature. Bulb diameter and bulb weight was highest at ambient +2℃ temperature (mean temperature at 12.0℃) during the growth period. Bulb/neck diameter ratio, over 2.0 a good indicator of development of bulb, increased rapidly at ambient +2℃ temperature. This result suggests that extremely early-maturing onion (Allium cepa L. cv. Singsingball) could maintain the higher productivity and bulb quality at ambient +2℃ temperature. On the contrary, 5℃ higher than atmospheric temperature shows negative effects on yields under a future climate change scenario.
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