• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 춘계학술대회
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• pp.43-43
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• 2022

• 한국작물학회:학술대회논문집
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• 한국작물학회 2021년도 춘계학술대회
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• pp.47-47
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• 2021

• 한국작물학회:학술대회논문집
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• 한국작물학회 2021년도 춘계학술대회
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• pp.48-48
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• 2021

• 한국작물학회지
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• 제54권4호
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• pp.416-421
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• 2009

This experiment was conducted to find out optimum priming treatment conditions to the sesame seed as a preliminary study for enhancing sesame germination properties. Effective priming agents and concentrations for sesame seed were $K_3PO_4$, 200 mM and PEG6000, -1.0 MPa respectively. Optimum priming temperature and duration were $15^{\circ}C$, 4 days in view of germination speed and germination percentage. PEG6000 with -1.0 MPa was selected as an efficient priming treatment condition at $15^{\circ}C$, 4 days. This study suggested that priming treatment to sesame seed would be an effective technique enhancing sesame seed germination and shortening time to the $T_{50}$ at the field condition, but the efficiency of priming treatments to the sesame seed would be strongly dependent on individual or integrated conditions of priming agent, concentration, temperature and duration etc.

• 한국작물학회지
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• 제61권3호
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• pp.163-170
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• 2016

Heading time is important element for yield and quality in crops. Among day length and temperature which influence on heading, temperature effect has not been investigated well. To investigate temperature effect on heading, heading date and plant growth characters were checked under the low and high temperature conditions in short day length. Analyzing heading date of six Korean varieties under the high and low temperature condition, heading date of varieties were delayed under low temperature. In the low temperature condition, dry weight and area of leaf were reduced. Varieties showing more delay of heading under low temperature also showed more reduction in leaf area. After selecting three varieties showing significant difference in leaf growth and heading date under different temperature conditions, nutrient contents of plant were analyzed. Nitrogen content was reduced in leaf and shoot under the low temperature condition. OsNRT2.3, nitrate transporter, was significantly down regulated in varieties showing more heading delay. Available phosphate content was decreased in leaf, but increased in shoot due to reduction of phosphate mobility. OsPT1, phosphate transporter regulating phosphate uptake, was more down regulated in varieties showing more heading delay. OsPT6, phosphate transporter regulating phosphate transport in plant, was also significantly down regulated in those varieties. With these data, we expected that active nitrogen and available phosphate uptake and transport in plant would increase leaf growth then might reduce heading delay under the low temperature condition.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.72-72
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• 2017

We found a new stay-green mutant from 'Pyeongwon' which is an early-maturing rice variety in Korea. The mutant showed green leaves after grain ripening period and it maintained higher SPAD value than wild type rice plant and original variety 'Pyeongwon'. The stay-green trait in rice, three genes have been identified up to date. The non-yellow coloring1 (NYC1) gene encodes a chloroplast-localized short-chain dehydrogenase/reductase (SDR) with three transmembrane domains. The non-yellow coloring3 (NYC3) gene encodes a plastid-localizing alpha/beta hydrolase-fold family protein with an esterase/lipase motif. The Sgr gene encodes a novel chloroplast protein and regulates the destabilization of the light-harvesting chlorophyll binding protein (LHCP) complexes of the thylakoid membranes, which is a prerequisite event for the degradation of chlorophylls and LHCPs during senescence. After sequencing the PCR products, we found a single nucleotide variation($A{\rightarrow}T$) in the NYC1 gene, which changes the amino acid lysine to methionine. The NYC1 gene encodes a short-chain dehydrogenase/reductase(SDR) protein. And we confirmed the co-segregation between SNP and stay-green trait from genotyping the progenies of the mutant.

• 한국육종학회지
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• 제43권5호
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• pp.383-390
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• 2011

Near-isogenic lines (NILs) carrying bacterial blight resistance genes (Xa4, xa5 and Xa21) were developed in japonica rice using Suweon345 as genetic background. NILs were selected by gene specific DNA markers and inoculation of K1 or K3a race. NILs conferring Xa4 were resistant to K1, K2, K3, and moderately resistant to K3a. NILs conferring xa5 were resistant to K1, K2, K3, and K3a. NILs having Xa21 were susceptible to K1, while resistant to K2, K3 and K3a. Target genes of NILs with the genetic background of Suweon345 were also confirmed by using eleven Philippines races and International Rice Bacterial Blight (IRBB) NILs carrying Xa4, xa5 and Xa21. All NILs had no significant difference from their recurrent parents in the major agronomic traits except for panicle length and brown rice 1,000 grain weight. Heading date of NILs ranged from Aug. 10 to Aug. 11, which was similar to that of recurrent parent, Suweon345. Culm length, number of grains per panicle and ratio of ripened grain of NILs were similar to those of Suweon345. Milled rice of NILs was ranged from 4.82 to 4.93MT/ha. These NILs will be useful for improving resistance to K3a race of bacterial blight pathogens in Korean japonica cultivars.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.129-129
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• 2022

The production area of Italian ryegrass feed is gradually increasing and labor-saving technologies are being developed. If sowing and fertilization are carried out agricultural drones, working hours and labor are reduced. The purpose of this study is to suggest an appropriate seedling amount for feed production by drone spreading of Italian ryegrass in spring. In addition, we would like to review the productivity of the drone seeding machine that is being developed by Rural Development Administration(RDA) of Korea. Italian ryegrass was sown by a drone in February at the NICS located in Gyehwa-hwa, Jeollabuk-do, South Korea. In Experiment 1, 50kg/ha, 60, 70, and 80 seeding rates were sown with a horizontal spreader drone. In Experiment 2, uniform spreaders type drone and horizontal spreader type were sown with the same seeding amount and compared. The drone was sown using the AF-52 aircraft. The higher the seeding amount, the higher the emergence rate. As the seeding amount increased, the plant length increased, but the number of tillers per individual decreased. The dry matter weight of the feed was the highest at 1,326kg/10a at the seeding rate of 70kg/ha, and decreased by 20.5% at the seeding rate of 80kg/ha. The coverage ratio was the highest at 96 at the seeding rate of 70kg/ha, which was the most advantageous for spring sowing. In the comparative experiment according to the spreader type, the uniform spreader had a high emergence rate per unit area. When the uniform spreader was used, the dry matter weight of the feed was 17% higher than that of the horizontal one, and the coverage was about 5% higher.

• 한국육종학회지
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• 제40권3호
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• pp.352-355
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• 2008

"운미"는 작물과학원 호남농업연구소에서 2007년에 육성한 조생 양질 내냉성 품종으로 주요특성과 수량성을 요약하면 다음과 같다. 1. "운미"의 출수기는 보통기 보비재배에서 평균 출수기가 7월 29일로 오대벼보다 2일 빠른 조생종이다. 2. 주당수수와 수당립수는 오대벼보다 많으며, 등숙비율은 다소 높으나 현미천립중은 오대벼보다 가벼운 중소립종이다. 3. 위조현상은 없고 성숙기 하엽노화가 늦으나 수발아는 오대벼보다 잘되는 편이다. 유묘기 내냉성과 출수지연일수는 오대벼와 비슷하나 내냉성 임실율은 오대벼에 비해 다소 낮은 편이다. 4. 잎도열병 및 흰잎마름병($K_1{\sim}K_3$)에는 저항성 반응을 보이며 줄무늬잎마름병 등 바이러스병에 약하다. 5. 쌀의 외관품위는 맑고 투명하며 아밀로스 함량은 오대벼보다 낮고 단백질 함량과 밥맛은 오대벼와 비슷하다 도정 특성은 오대벼 보다 높다. 6. 쌀수량이 5.16 MT/ha으로 오대벼 대비 4% 증수되었다.

• 한국육종학회지
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• 제42권6호
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• pp.615-622
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• 2010

'조아미'는 국립식량과학원 상주출장소에서 중산간지 재배에 알맞은 고품질 벼를 육성하고자 일본품종 'Yukara'와 중국품종 'Tonggae112'가 교배된 조합에 밥맛이 좋은 '삼백벼'를 삼원교배한 이후 계통육성시험에서 YR20557-1-1-3-B-3을 선발하였고, 2004년부터 2005년까지 생산력검정시험에 공시한 결과 수량성이 높아 '상주 36호'라는 계통명을 부여하였다. '상주 36호'는 2006년부터 2008년까지 3년간 지역적응시험에서 표준품종 대비 그 수량 및 품질의 우수성을 인정받아 2008년 농작물 직무육성 신품종 선정위원회에서 국가목록등재 품종으로 선정되어 '조아미'로 명명하였다. '조아미'는 중북부평야지. 중부중산간지 및 동북부 해안지에 적응성이 높은 조생 고품질 벼 품종으로 주요특성은 다음과 같다. 1. 출수기는 중북부평야지 보비재배에서 7월 28일로 '화성벼'에 비해 15일정도 빠르고, 남부중산간지, 중부중산간지지 및 동북부 해안지 보통기 재배에서 평균 7월 30일로 '오대벼'의 출수기와 같은 조생종이다. 2. 이삭 길이는 18 cm 정도로 다소 짧고 착립밀도는 보통이며 추출은 양호한 편이다. 까락이 해에 따라 다소 발생하며 탈립은 안되는 편이다. 3. '오대벼' 대비 주당수수가 많고 수당립수는 비슷하며 등숙비율은 높지만 현미 천립중이 다소 가벼운 20.6 g의 소립종이다. 4. 쌀의 완전미율이 '오대벼' 보다 높고, 심복백이 없으며 맑고 투명하다. '오대벼'에 비해 아밀로스 함량이 낮아 밥맛이 양호하다. 5. 도열병에는 강하나 흰잎마름병과 바이러스병에는 약하며 해충에 대한 저항성은 없다. 6. 전국 9개소 3개년의 지역적응성시험에서 수량성은 5.4MT/ha으로 '오대벼' 대비 6% 증수되었다.