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Response of Rice Growth under $CO_2$ Enrichment  

Kim Young-Guk (National Institute of Crop Science)
Shin Jin-Chul (National Institute of Crop Science)
Choi Min-Gyu (National Institute of Crop Science)
Koo Bon-Cheul (National Institute of Crop Science)
Kim Seok-Dong (National Institute of Crop Science)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.50, no.3, 2005 , pp. 179-185 More about this Journal
Abstract
The effects of $CO_2$ enrichment on growth of rice (Oryza sativa L.) were examined. The plants were grown in growth chambers with a 12-h photoperiod and a day/night temperature of $28/21^{\circ}C$ of the seedling stage and $30/23^{\circ}C$ after the panicle initiation stage. The plants were exposed to two elevated $CO_2$ of 500, 700 ppm and ambient levels (350 ppm). At early growth stage of three varieties (IIpumbyeo, Chucheongbyeo, Hwaseongbyeo), the elevated $CO_2$ increased plant height, tiller, leaf area and dry weight. The photosynthetic rate was decreased at 24 days after treatment (DAT) compared to 11 DAT. The elevated $CO_2$ increased plant height and dry weight at panicle initiation stage (PIS) and heading stage (HS) of three varieties (IIpumbyeo, Chucheongbyeo, Hwaseongbyeo). The photosynthetic rate, stomatal conductance, evapotranspiration rate were decreased at the long days of treatment than that of short days. At entire stages, the elevated $CO_2$ increased the water use efficiency of rice plant because evapotranspiration rate was lowered at the elevated $CO_2$ than ambient levels.
Keywords
enrichment; rice; photosynthetic rate; stomatal conductance; evapotranspiration rate; elevated;
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