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RISS 인기검색어
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- 저자 : 조기원(Giwon Cho) (검색결과 2 건)
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윤여태(Yeotae Yun),김규철(Gyucheol Kim),조기원(Giwon Cho),정종태(Chongtae Chung),윤덕상(Tugsang Yun) 한국육종학회 2022 한국육종학회지 Vol.54 No.4
Early maturing rice cultivars grown in plain areas have an undesirable appearance due to high temperatures during the grain-filling stage. Therefore, developing early maturing rice cultivars with desirable appearance traits in plain areas is the primary goal of rice breeding programs. This study aimed to develop an early maturing rice cultivar adaptable to early transplanting cultivation in the Chungnam plain area. To develop “Yeoreumi,” two breeding materials were used, good-quality “Joami” from the Chungnam plain area and “Hokuto” having the fastest heading date among the genetic resources and originating from Japan. These two resources were crossed in 2010 to develop the “Yeoreumi” cultivar using the pedigree method. A yield trial was conducted in 2015-2016, and a local adaptability test was conducted in 2017-2019. The heading date of “Yeoreumi” was July 10, when it was transplanted early in the Chungnam plain area, and it could be harvested at August end, which was sufficient to produce a fresh stock of rice before “Chuseok, which is the Korean Thanksgiving Day.” The yield of milled rice was approximately 5.29 MT/ha in the local adaptability test, which was 0.47 MT/ha higher than that of “Jinbuolbyeo.” Additionally, its grain quality was good, with 89.9% head rice and 67.6 glossiness of cooked rice. Overall, the results of this study indicated that “Yeoreumi” was suitable for early transplanting cultivation in the Chungnam plain area for “Chuseok,” and could be used as a representative early maturing rice cultivar in Chungcheongnam-do (Registration No. 8597).
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충남평야지에서 극조생 ‘빠르미’ 벼 이앙시기에 따른 생육 및 품질 변화
윤여태(Yeotae Yun),김규철(Gyucheol Kim),조기원(Giwon Cho),윤덕상(Tugsang Yun) 한국육종학회 2022 한국육종학회지 Vol.54 No.4
This study was performed to determine the optimum transplanting dates of ‘Bbareumi’ in the Chungnam Plain area. ‘Bbareumi’ was transplanted into a rice research field of Chungnam Agricultural Research and Extension Services at intervals of approximately 15 days from April 17th to August 1st in 2019 and 2020. The heading dates of ‘Bbareumi’ were June 23rd to September 2nd depending on transplanting dates. The highest milled-rice yield was 5.61 MT/ha on May 1st and the lowest was 3.65 MT/ha on August 1st. As the transplanting date was delayed, protein content increased; however, the number of days from transplanting to heading decreased. Protein content and the number of days from transplanting to heading showed a highly significant correlation (R2 = 0.802**). Therefore, it was found that early transplanting was beneficial to produce lower protein content because head rice percentage was 84-87% for early (April 17th to May 16th), 74-80% normal (June 1st to June 16th), and 86-95% for the late transplanting date (July 1st to August 1st). The mean temperature during the ripening stage differed according to the transplanting dates, and early transplanting showed a lower temperature than the normal one (May 16th to June 15th) and a higher head rice percentage. Therefore, extremely early maturing rice cultivars should be transplanted between late April and early May to obtain lower protein content and higher head rice percentage. These results will be useful for rice breeding programs, as it is generally recognized that early transplanting results in poor rice quality; however, this study revealed contrasting results.
KCI
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