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Shon, Zang-Ho,Kim Ki-Hyun,Bower, Keith N.,Lee, Gangwoong,Kim, Jiyoung 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.E3
In this study, we examined the influence of long-range transport of dust particles and air pollutants on the photochemistry of NO, on Jeju Island, Korea (33.17˚N, 126.10˚ E) during the Asian Dust-Storm (ADS) period of April 2001. Three ADS events were observed during the periods of 10~12, 13~14, and 25~26 April. Average concentration level of nighttime N₂O₃) on Jeju Island during the ADS period was estimated to be about 2 x 10^8 molecules cm-3) (~9 pptv). Decreases in NO₃) levels during the ADS period was likely to be determined mainly by the enhancement of the N₂O_(5) heterogeneous reaction on dust aerosol surfaces. The reaction of N₂O_(5) on aerosol surfaces was a more important sink for nighttime NO₃) during the ADS due to the significant loading of dust particles. The reaction of N₂NO₃ with NMHCs and the gas-phase reaction of N₂O_(5) with water vapor were both significant loss mechanisms during the study period, especially during the NADS. However, dry deposition of these oxidized nitrogen species and a heterogeneous reaction of NO₃were of no importance. Short-term observations of O₃, NO₂,DMS, and SO₂ in the MBL indicated that concentrations of most of these chemical species were different between the ADS and non-Asian-Dust-Storm (NADS) periods, implying that their levels were affected sensitively by the differences in air mass trajectories.
김준환,Jiyoung Shon,Hanyong Jeong,Woonho Yang,Chung-Kuen Lee,김광수 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.4
The late marginal heading date (LMHD) for normal maturation has been assessed to infer the range of late transplanting date andapplicability of a new cropping system. A minimum threshold temperature for grain filling can be used to determine the late marginalheading date that would allow normal maturation. In this study, a statistical procedure was developed to determine the threshold temperaturefor 40 days of the grain-filling period. The threshold temperature was chosen to be the minimum temperature at whichgrain-filling ratio and weight are minimally affected. To identify the threshold temperature, grain-filling ratio and weight, whichwere observed at two sites for 2 years in Korea, were compared with a range of cumulative temperature during 40 days in the lateseason. As a result, cumulative temperature of 800, which is equivalent to, on average, 20 during 40 days of grain-filling period,was determined to be the threshold temperature for normal grain filling in the late season. The LMHD for normal maturation wasalso determined from cumulative probability density function of dates from which the threshold temperature of 800 was met duringthe last 15 years as well as 33 years. Our results suggested that it would be better to use the cumulative density function of thosedates derived from the last 15 years rather than 33 years because current climate conditions could be better represented by the densityfunction derived from recent years
Kim, Junwhan,Shon, Jiyoung,Lee, Chung-Kuen,Yang, Woonho,Yoon, Youngwhan,Yang, Won-Ha,Kim, Yuon-Gyu,Lee, Byun-Woo Elsevier 2011 Field crops research Vol.122 No.3
<P><B>Highlights</B></P><P>► We observed leaf senescence and grain filling process under high temperature. ► Grain filling process terminated before leaf senescence was completed under high temperature. ► Leaves keep its photosynthesis ability even after grain filling termination. ► Theses results support that grain filling duration depend on duration of sink activity rather than source activity under high temperature.</P> <P><B>Abstract</B></P><P>High temperature during grain filling period has been reported to decrease the grain filling duration, leading to the lower grain weight and yield of rice. Two experiments in the phytotron and field were carried out to test the hypothesis that the leaf senescence of rice plants may determine the grain filling duration under high temperature. In the phytotron experiment in 2008, rice plants of a japonica cultivar “Ilpumbyeo” were subjected to three minimum/maximum (mean) temperature regimes of 11/19 (15), 17/25 (21), and 23/31°C (27°C). In the field experiment, rice seedlings of the same rice cultivar were transplanted on May 6th and June 19th in 2009 and the mean temperatures during the grain filling period were 24.4 and 21.9°C, respectively. Both experiments revealed consistently that high temperature increased the rates of grain filling and leaf senescence while it reduced the durations of them. However, grain filling was terminated earlier than complete leaf senescence, the time gap being greater at higher temperature. In addition, the fraction of dry matter partitioning to the leaf sheath+culm resumed to increase following the termination of grain filling under high temperature, indicating that leaves were still maintaining photosynthetic capacity and supplying assimilates into the other plant tissues except grain even after the termination of grain filling. These findings suggest that an early termination of grain filling in temperate rice under high temperature was not resulted from the lack of assimilate owing to the early leaf senescence but from the loss of sink activity owing to the earlier senescence of panicle.</P>
밀 유전자원의 단백질 특성 분석 및 글루텐 단백질 조성 평가
이명희(Myoung Hui Lee),최창현(Changhyun Choi),김경훈(Kyeong-Hoon Kim),손재한(Jae-Han Son),박진희(Jinhee Park),이고은(Go Eun Lee),최준용(Jun Yong Choi),강천식(Chon-Sik Kang),손지영(Jiyoung Shon),고종민(Jong-Min Ko),김경민(Kyeong-Min K 한국육종학회 2022 한국육종학회지 Vol.54 No.4
Gluten proteins in wheat grains are generally considered one of the most important factors in determining dough properties and bread quality. In this study, wheat protein quality characteristics were investigated in 607 varieties collected from seven countries grown in a South Korean wheat breeding field for two years. The average protein content was 12.2±1.86%, and the sodium dodecyl sulfate-sediment volume (SDSS) was 46.9±8.39 mL. HI-LINE had the highest protein content (18.3±0.35%) and SDSS (76.7±1.98 mL), while both NE 84557 and Iksan 374 showed small deviations in protein content and SDSS. Protein content and SDSS values were higher in Ax2*+By8 and By9+Dy10 combinations at Glu-A, Glu-B1, and Glu-D1 loci of high molecular weight gluten subunit (HMW-GS) than in other combinations. However, no difference in Glu-A3 and Glu-B3 loci in LMW-GS was observed. Furthermore, in HMW-GS, the composition of Glu-D1 Dy10 and Dy12 had a greater effect on protein quality than Glu-B1 By8 and By9 when the allele of Glu-A1 had Ax2*. Significant differences were found between Dy10 and Dy12 genes of the HMW-GS Glu-D1 and between protein content and SDSS, but not among others. These results suggest that Glu-D1 is extremely important for improving protein quality in HMW-GSs. As a result of this study, HMW-GS allele selection using functional markers, protein content, and SDSS investigation are expected to enable the development of varieties with high protein quality that are stable amid various environmental changes.
백립계 대립 붉은곰팡이병 중도저항성 제빵용 밀(Triticum aestivum L.) ‘백강’
김경민(Kyeong-Min Kim),김경훈(Kyeong-Hoon Kim),최창현(Chang-Hyun Choi),정한용(Han Young Jeong),박진희(Jinhee Park),양선목(Sun-Mok Yang),손지영(Jiyoung Shon),박태일(Tae-Il Park),강천식(Chon-Sik Kang) 한국육종학회 2021 한국육종학회지 Vol.53 No.2
A new winter wheat (Triticum aestivum L.) cultivar ‘Baekkang’ was developed by the National Institute of Crop Science (NICS)and Rular Development Administration (RDA) in 2015. Its heading date was April 23, and its maturity date was June 3, similar to that of‘Keumkang’. ‘Baekkang’ had a shorter culm length (75 cm), longer spike length (8.0 cm), more spikes per m2(703), and more 1,000-grainweight (47.5 g) than those of ‘Keumkang’, which were 76 cm, 7.6 cm, 631, 46.4 g, respectively. ‘Baekkang’ was not a winter hardy cropand is susceptible to powdery mildew. However, it has moderate resistance to fusarium head blight. The average grain yield in the advancedyield trial was 5.5 MT/ha, 20% more than ‘Keumkang’. In the regional yield trial, this average yield was 5.1 MT/ha upland and 5.2 MT/hain the paddy field, which were 10% and 18% more than that of ‘Keumkang’, respectively. Baekkang’s flour yield (71.2%) and flour lightness(92.40) showed similarities to those of ‘Jokyung’. ‘Baekkang’ also showed a higher protein content (12.4%), gluten content (10.1%), andSDS-sedimentation volume (60.0 ml). These results showed that the ‘Baekkang’ flour’s dough strength was greater than that of ‘Jokyung’. Baekkang’shigh molecular weight gluten subunits composition was Glu-D1 (5+10), granule-bound starch synthase composition was Wx-A1 (a), Wx-B1(a), and Wx-D1 (a), and puroindoline composition was Pina-D1(a) and Pinb-D1(b) (Registration No. 6966).