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http://dx.doi.org/10.5532/KJAFM.2018.20.4.296

The change of grain quality and starch assimilation of rice under future climate conditions according to RCP 8.5 scenario  

Sang, Wan-Gyu (National Institute of Crop Science, Rural Development Administration)
Cho, Hyeoun-Suk (National Institute of Crop Science, Rural Development Administration)
Kim, Jun-Hwan (National Institute of Crop Science, Rural Development Administration)
Shin, Pyong (National Institute of Crop Science, Rural Development Administration)
Baek, Jae-Kyeong (National Institute of Crop Science, Rural Development Administration)
Lee, Yun-Ho (National Institute of Crop Science, Rural Development Administration)
Cho, Jeong-Il (National Institute of Crop Science, Rural Development Administration)
Seo, Myung-Chul (National Institute of Crop Science, Rural Development Administration)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.20, no.4, 2018 , pp. 296-304 More about this Journal
Abstract
The objective of this study was to analyze the impact of climate change on rice yield and quality. Experiments were conducted using SPAR(Soil-Plant-Atmosphere-Research) chambers, which was designed to create virtual future climate conditions, in the National Institute of Crop Science, Jeonju, Korea, in 2016. In the future climate conditions($+2.8^{\circ}C$ temp, 580 ppm $CO_2$) of year 2051~2060 according to RCP 8.5 scenario, elevated temperature and $CO_2$ accelerated the heading date by about five days than the present climate conditions, resulted in a high temperature environment during grain filling stage. Rice yield decreased sharply in the future climate conditions due to the high temperature induced poor ripening. And the spikelet numbers, ripening ratio, and 1000-grain weight of brown rice were significantly decreased compared to control. The rice grain quality was also decreased sharply, especially due to the increased immature grains. In the future climate conditions, expression of starch biosynthesis-related genes such as granule-bound starch synthase(GBSSI, GBSSII, SSIIa, SSIIb, SSIIIa), starch branching enzyme(BEIIb) and ADP-glucose pyrophosphorylase(AGPS1, AGPS2, AGPL2) were repressed in developing seeds, whereas starch degradation related genes such as ${\alpha}-amylase$(Amy1C, Amy3D, Amy3E) were induced. These results suggest that the reduction in yield and quality of rice in the future climate conditions is likely caused mainly by the poor grain filling by high temperature. Therefore, it is suggested to develop tolerant cultivars to high temperature during grain filling period and a new cropping system in order to ensure a high quality of rice in the future climate conditions.
Keywords
Climate change; Rice; Quality; SPAR Chamber;
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