• The Plant Pathology Journal
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• 제31권1호
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• pp.41-49
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• 2015

Sweet cherry is an important fruit crop with increasing economical value in Turkey and the world. A number of viruses cause diseases and economical losses in sweet cherry. Prune dwarf virus (PDV), is one of the most common viruses of stone fruits including sweet cherry in the world. In this study, PDV was detected from 316 of 521 sweet cherry samples collected from 142 orchards in 10 districts of Isparta province of Turkey by double antibody sandwich-enzyme linked immunosorbent assay (DAS-ELISA). The presence of PDV in ELISA positive samples was confirmed in 37 isolates by reverse transcription- polymerase chain reaction (RT-PCR) method. A genomic region of 862 bp containing the coat protein (CP) gene of PDV was re-amplified from 21 selected isolates by RT-PCR. Amplified DNA fragments of these isolates were purified and sequenced for molecular characterization and determining genetic diversity of PDV. Sequence comparisons showed 84-99% to 81-100% sequence identity at nucleotide and amino acid level, respectively, of the CP genes of PDV isolates from Isparta and other parts of the world. Phylogenetic analyses of the CP genes of PDV isolates from different geographical origins and diverse hosts revealed that PDV isolates formed different phylogenetic groups. While isolates were not grouped solely based on their geographical origins or hosts, some association between phylogenetic groups and geographical origins or hosts were observed.

• 천문학회지
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• 제39권3호
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• pp.57-71
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• 2006

We investigated the structural parameters of a sample of 30 dwarf galaxies(15 dEs and 15 dS0s) in the Virgo Cluster using i-band images from the Sloan Digital Sky Survey Data Release 4. Among 28 galaxies for which surface brightness profiles were derived from ellipse fittings, 23 galaxies had a single component that was adequately described by a generalized $S\acute{e}rsic$ function with a shape parameter ranging from n=0.5 to 2, while 5 galaxies(2 dEs and 3 dS0s) had bulge and disk components that were fitted by a generalized $S\acute{e}rsic$ function and an exponential function, respectively. Since the majority of dwarf galaxies in the present sample had a single component, it seems likely that genuine dS0 galaxies that have disk and bulge components are quite rare in the Virgo Cluster. The similarity in structural parameters of genuine dS0 galaxies in the Virgo Cluster with those of Magellanic-type galaxies implies that the progenitors of dwarf lenticular galaxies in the Virgo Cluster were most likely Magellanic-type galaxies if dS0s are harassed late-type spirals.

• 한국잠사곤충학회지
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• 제44권1호
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• pp.1-3
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• 2002

뽕나무 오갈병의 발생률이 적은 장려뽕품종 “상일뽕”생장점에 Colchicine 적하처리를 하여 4배성인 4원뽕27호를 육성하였으며 그 주요 특성은 다음과 같다. 1. 염색체수는 2n=56인 4배체 이다. 2. 봄철 발아개엽기는 중생뽕이며 잎모양은 타원형과 3열엽이 혼재하는 폭광형이고 잎두께는 두껍다. 3. 가지길이와 마디사이 길이는 짧고 가지 기부의 불발아가 없으며 내동성은 모품종인 상일뽕보다 강하다.

• 천문학회보
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• 제43권2호
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• pp.59.4-60
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• 2018

Ultra-diffuse galaxies (UDGs) are an unusual galaxy population. They are ghostlike galaxies with fainter surface brightness than normal dwarf galaxies, but they are as large as MW-like galaxies. The key question on UDGs is whether they are 'failed' giant galaxies or 'extended' dwarf galaxies. To answer this question, we study UDGs in massive galaxy clusters. We find an amount of UDGs in deep HST images of three Hubble Frontier Fields clusters, Abell 2744 (z=0.308), Abell S1063 (z=0.347), and Abell 370 (z=0.374). These clusters are the farthest and most massive galaxy clusters in which UDGs have been discovered until now. The color-magnitude relations show that most UDGs have old stellar population with red colors, while a few of them show bluer colors implying the existence of young stars. The stellar masses of UDGs show that they have less massive stellar components than the bright red sequence galaxies. The radial number density profiles of UDGs exhibit a drop in the central region of clusters, suggesting some of them were disrupted by strong gravitational potential. Their spatial distributions are not homogeneous, which implies UDGs are not virialized enough in the clusters. With virial masses of UDGs estimated from the fundamental manifold, most UDGs have M_200 = 10^10 - 10^11 M_Sun indicating that they are dwarf galaxies. However, a few of UDGs more massive than 10^11 M_Sun indicate that they are close to failed giant galaxies.

• 식물병연구
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• 제28권1호
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• pp.32-38
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• 2022

A survey of Barley yellow dwarf virus (BYDV) was conducted in major oat-growing areas of Korea in 2020. BYDV is an economically important pathogen of cereal crops that can be transmitted by aphids. The present study evaluated the genetic composition of BYDV in oat from eight geographical areas in Korea. Multiplex reverse transcription-polymerase chain reaction was used to screen 322 oat leaf samples for six BYDV strains (PAV, MAV, SGV, PAS, RPV, and RMV). The 125 samples (~39%) tested positive for BYDV. BYDV-PAV, BYDV-SGV, BYDV-PAS, and BYDV-RPV were detected from oat in different areas. Most of the BYDV-infected samples were assigned to subgroup I (n=112). The results indicate that BYDV-PAV could be dominant throughout Korea. Also, the phylogenetic analysis of coat protein sequences indicated that 23 BYDV isolates from Korea could be separated into two clades, which exhibited high nucleotide sequence similarity. In conclusion, the present survey provides a BYDV infection assessment for domestic oat varieties in Korea and basic information for the development of BYDV control measures in Korea's oat industry.

• 한국작물학회지
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• 제35권2호
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• pp.165-170
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• 1990

단간유전자와 GA$_3$ 반응성과의 연관관계를 검토하기 위하여 단간품종들 Fukei 71, 설악벼, Tanginbozu와 이들의 F$_1$ 및 F$_2$에 GA$_3$를 처리하여 절간신장에 미치는 지베렐린의 효과를 검토하였다. 1. 공시한 단간품종들중 설악벼와 Tanginbozu는 GA$_3$에 간장이 크게 신장되었으나 Fukei 71은 GA$_3$에 간장이 신장되지 않았다. 2. 3개 교배조합의 F$_1$은 모두 장간으로 나타나 Fukei 71, 설악벼 및 Tanginbozu는 서로 다른 단간유전자가 간장에 관여하고 있음을 확인하였다. 이들 F$_1$에 GA$_3$를 처리하였을 때 모두 간장이 크게 신장하여서 GA$_3$ 무반응성에 대하여 GA$_3$ 반응성이 우성으로 작용하였다. 3. GA$_3$ 반응성 품종간 조합 설악벼/Tanginbozu의 F$_2$에서는 GA$_3$를 처리한 결과 모든 개체들에서 간장이 신장되어 전체적으로 장간화하였으며 간장은 대체로 9:6:1의 분리경향을 보였다. 4. GA$_3$ 반응성 품종과 무반응성 품종간 조합 즉 설악벼/Fukei 71과 Fukei 71/Tanginbozu의 F$_2$에서는 무처리구에서 대체로 9:7과 9:6:1의 분리경향을 보였으나 처리구에서는 대체로 13:3의 분리경향을 보였다. 5. 설악벼/Fukei 71, Fukei 71/Tanginbozu 조합의 F$_2$에서 GA$_3$ 무반응성 개체만을 골라 Fukei 71로 backcross한 BC$_1$F$_1$ 개체에 GA$_3$를 처리하여 간장과 GA$_3$ 반응성을 조사한 결과, 조합내 개체들간에 간장의 분리를 인정할 수 없었고, GA$_3$ 처리에 무반응성을 보였다. 따라서 Fukei 71의 단간유전자 d50은 GA$_3$ 무반응성과 밀접한 연관이 있는 것으로 생각되었다.

• 한국육종학회지
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• 제49권1호
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• pp.41-46
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• 2017

밭작물 기계화를 위한 키작은 수수의 수요가 높음에 따라 찰성 갈색종피 '황금찰'과 단간 흰색 종피 메성 '중모4001'를 인공교배하여 육성한 '소담찰'의 주요 특성을 요약하면 다음과 같다. '소담찰'의 개화기는 '황금찰'에 비해 8일 늦고, 키는 91cm로 '황금찰'에 비해 55cm 작은 단간 품종이다. '소담찰'의 주당이삭수(1.1개)가 적고 이삭중(48.9 g), 이삭당 종실중(32.5 g), 천립중(21.1 g) 등 수량구성요소는 유사한 수준이었다. 이삭은 역삼각형이며 영과색이 짙은 갈색이며, 배유의 아밀로스 함량이 5.98%로 찰수수에 해당하며, DPPH, ABTS 소거 항산화 활성이 '황금찰'에 비해 높은 것으로 나타났다. 종실수량은 지역 적응시험 평균 2.95 MT/ha로서 표준품종과 비슷한 수준이다. 소담찰은 단간으로 도복에 강한 특성을 가져 특히 기계수확에 적합한 품종이다(Fig. 2).

• 천문학회보
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• 제24권2호
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• pp.48-49
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• 1999

• 천문학회보
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• 제30권2호
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• pp.82.2-82.2
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• 2005

• 천문학회보
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• 제30권2호
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• pp.82.1-82.1
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• 2005