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http://dx.doi.org/10.7740/kjcs.2020.65.3.161

Improvement of Seedling Establishment in Wet Direct Seeding of Rice using the Anaerobic Germination Tolerance Gene Derived from Weedy Photoblastic Rice  

Jeong, Jong-Min (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Mo, Youngjun (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Baek, Man-Kee (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Kim, Woo-Jae (International Technology Cooperation Division, Rural Development Administration)
Cho, Young-Chan (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Ha, Su-Kyung (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Kim, Jinhee (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Jeung, Ji-Ung (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Kim, Suk-Man (Crop breeding Division, National Institute of Crop Science, Rural Development Administration)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.65, no.3, 2020 , pp. 161-171 More about this Journal
Abstract
Direct seeding is one of the rice seedling establishment methods that is increasingly being practiced by farmers to save labor and reduce costs. However, this method often causes poor germination under flooding conditions after sowing. In this study, we developed japonica elite lines with quantitative trait loci (QTL) associated with anaerobic germination (AG) tolerance to overcome poor germination and seedling establishment in wet direct seeding. The QTL introgression lines were developed from a cross between weedy photoblastic rice as the AG donor and the Nampyeong variety via phenotypic and genotypic selection. Compared to Nampyeong, the survival rates of the selected lines were improved by approximately 50% and 240% under field and greenhouse conditions, respectively. To improve selection efficiency by marker assisted selection, the QTL markers associated with AG tolerance were converted to cleaved amplified polymorphic sequence markers designed based on next-generation sequence analysis. These lines retained similar agronomic traits and yield potential to the parent, Nampyeong. Among these lines, we selected the most promising line, which exhibited high survival rate and good agricultural traits under flooding conditions and named the line as Jeonju643. This line will contribute to breeding programs aiming to develop rice cultivars adapted to wet direct seeding. This study demonstrates the successful application of marker-assisted selection to targeted introgression of anaerobic genes into a premium quality japonica rice variety.
Keywords
anaerobic germination (AG); breeding; direct seeding; DNA markers; rice;
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