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http://dx.doi.org/10.7740/kjcs.2013.58.2.107

Study on Improving High-temperature Tolerance for Grain Filling Through Adjusting Sink Size  

Kim, Junhwan (National Institute of Crop Science, RDA)
Shon, Jiyoung (National Institute of Crop Science, RDA)
Choi, Kyung-Jin (National Institute of Crop Science, RDA)
Yoon, Younghwan (National Institute of Crop Science, RDA)
Lee, Chung-Kuen (National Institute of Crop Science, RDA)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.58, no.2, 2013 , pp. 107-112 More about this Journal
Abstract
The aim of this study was to test hypothesis that low sink size could mitigate deterioration of grain filling characteristics under high grain filling temperature. To achieve this aim, we selected Donganbyeo as a tolerant and Ilpumbyeo as susceptible variety to high temperature during grain filling period through screening 6 rice varieties. Then their spikelets number and the ratio of superior and inferior spikelet were compared. Grain weight and head rice ratio of Ilpumbyeo decreased significantly in high temperature. Ilpumbyeo had more spikelets than Donganbyeo. However, there was no significant difference between two varieties in the ratio of superior and inferior spikelets. So we tried to investigate the varietal difference of grain filling characteristics with removing inferior spikelets. Removing inferior spikelet in both of varieties could recover grain weight but not improve head rice ratio under high temperature. These results showed that sink/source ratio affected grain weight but didn't affect head rice ratio. Therefore, new approach was required to improve head rice ratio beyond sink/source ratio under high temperature.
Keywords
grain filling; high temperature; sink; Ilpumbyeo; Donganbyeo;
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