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Characteristics Evaluation of Peach Genetic Resources for Establishing a Core Collection in Peach
Namhee Jeong,Jung Hyun Kwon,Ju-Hyun Lee,Kidong Hwang,Ji Hae Jun 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
In this study, characteristics evaluation was performed on 441 peach genetic resources in order to establish a core collection in peach. Characteristics evaluation of peach genetic resources was investigated for 3 years (2018-2020) at the National Institute of Horticultural and Herbal Science (Wanju-gun, Jeollabuk-do). Total peach genetic resources consist of 400 varieties for fresh edible, 1 variety for processing, 6 for ornamental, 13 for rootstock, and 21 for unknown. We evaluated characteristics for various traits such as phenological characteristics (e.g., time of beginning of flowering, full bloom stage, and time of maturity), morphological characteristics of the flowers and leaves (e.g., flower type and leaf shape index), and fruit quality factors (e.g., fruit weight, fruit type, pubescence on the fruit skin, flesh color, soluble solids content, and titratable acidity) in peach. As a result of characterization of peach genetic resources, the time of beginning of flowering and full bloom stage were distributed from March 22 to April 15. The time of maturity was also distributed from June 14 to September 28. The flower type was showy (rosette) 79.5% and non showy (campanulate) 20.5%. The leaf shape index ranged from 2.62 to 8.73. In addition, the distribution of fruit weight was investigated from 44.7g to 441.8g. Apporoximately 62.4% of total varieties were white-fleshed peach, while 37.6% were yellow-fleshed peach. In the fruit type, 42.7% of the circular type, 54.1% of the elliptic type, and 3.2% of the oblate type were investigated. Peaches with pubescence on the fruit skin were 78.7% and nectarines were 21.3%, and soluble solids content and titratable acidity were evaluated. The results of characteristics evaluation of these peach genetic resources will be usefully used for the selection of core resources for future breeding programs. Furthermore, the phenotype data generated as these results will be possible genome-wide association studies as well as establishing of peach core collection using the genotype data generated through the whole genome sequencing of peach genetic resources. Taken together, these results will be able to contribute greatly for peach molecular breeding and peach genetic analyses.
Namhee Jeong(정남희),Seung-Ho Jeon(전승호),Dool-Yi Kim(김둘이),Choonseok Lee(이춘석),Hyun-Choong Ok(옥현충),Ki-Do Park(박기도),Ha-Cheol Hong(홍하철),Seung-Sik Lee(이승식),Jung-Kyung Moon(문중경),Soo-Kwon Park(박수권) 한국생명과학회 2016 생명과학회지 Vol.26 No.10
밀의 고분자 글루테닌 서브유닛[high molecular-weight glutenin subunit (HMW-GS)]은 밀가루의 성질을 결정하는데 가장 중요한 요소이며 가공적성을 나타내는데 중요한 역할을 수행한다. 우리는 Agrobacterium 동시 형질전환법을 이용하여 한국 밀 품종인 ‘조경’으로부터 밀 HMW-GS을 암호화하는 TaGlu-Ax1 유전자를 가지는 marker-free 형질전환 벼를 생산하였다. TaGlu-Ax1 유전자의 종자 특이적 발현을 위하여 밀에서 존재하는 TaGlu-Bx7 유전자의 자체 프로모터를 벡터 내에 삽입하였다. 동시 접종을 위해서 오직 TaGlu-Ax1 유전자와 hygromycin phosphotransferase II (HPTII) 저항성 유전자만으로 구성된 두 종류의 발현 카세트를 독립적으로 Agrobacterium EHA105에 도입하였고, TaGlu-Ax1와 HPTII가 도입된 각각의 EHA105 Agrobacterium을 3:1 비율로 혼합하여 벼캘러스에 접종하였다. 210개의 HPTII 저항성 형질전환체 중에서 벼 게놈에 TaGlu-Ax1과 HPTII가 모두 삽입된 20개의 형질전환 라인을 획득하였다. TaGlu-Ax1와 HPTII가 벼 게놈에 도입된 것을 Southern blot을 통해서 다시 확인하였다. 형질전환 벼 T1 세대의 종자에서 밀 TaGlu-Ax1 유전자가 전사와 번역되어 오직 TaGlu-Ax1만을 가지는 marker-free 식물체를 T1세대에서 성공적으로 선발할 수 있었다. TaGlu-Ax1 유전자가 발현되는 marker-free 형질전환 식물체는 야생형(wild type)과의 표현형 차이는 없었다. 형질전환 벼의 쌀가루의 제빵적성을 비교하였을 때 TaGlu-Ax1 유전자만이 발현되어서는 제빵적성이 더 나아지지 않았다. 그러므로 더 많은 밀 고분자 및 저분자 글루테닌, 글리아딘의 유전자의 집적과 조합이 쌀가루 가공적성을 증진시키는데 필요하다. 결론적으로 TaGlu-Ax1 marker-free 형질전환 벼는 쌀가루 가공적성을 증진시키는데 좋은 재료로 사용될 것이다. High-molecular-weight glutenin subunits (HMW-GSs) are extremely important determinants of the functional properties of wheat dough. Transgenic rice plants containing a wheat TaGlu-Ax1 gene encoding a HMG-GS were produced from the Korean wheat cultivar ‘Jokyeong’ and used to enhance the bread-making quality of rice dough using the Agrobacterium-mediated co-transformation method. Two expression cassettes with separate DNA fragments containing only TaGlu-Ax1 and hygromycin phosphotransferase II (HPTII) resistance genes were introduced separately into the Agrobacterium tumefaciens EHA105 strain for co-infection. Rice calli were infected with each EHA105 strain harboring TaGlu-Ax1 or HPTII at a 3:1 ratio of TaGlu-Ax1 and HPTII. Among 210 hygromycin-resistant T0 plants, 20 transgenic lines harboring both the TaGlu-Ax1 and HPTII genes in the rice genome were obtained. The integration of the TaGlu-Ax1 gene into the rice genome was reconfirmed by Southern blot analysis. The transcripts and proteins of the wheat TaGlu-Ax1 were stably expressed in rice T1 seeds. Finally, the marker-free plants harboring only the TaGlu-Ax1 gene were successfully screened in the T1 generation. There were no morphological differences between the wild-type and marker-free transgenic plants. The quality of only one HMW-GS (TaGlu-Ax1) was unsuitable for bread making using transgenic rice dough. Greater numbers and combinations of HMW and LMW-GSs and gliadins of wheat are required to further improve the processing qualities of rice dough. TaGlu-Ax1 marker-free transgenic plants could provide good materials to make transgenic rice with improved bread-making qualities.
Namhee Jeong,Jung-Kyung Moon,Kiwoung Yang,Hong-Sig Kim,Soon-Chun Jeong 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Most soybean cultivars have ovate leaflets, although a few cultivars have narrow or lanceolate leaflets. Narrow leaflet cultivars tend to have more seeds produced per pod than ovate leaflet cultivars, suggesting that the narrow leaflet trait is tightly linked to or cosegregating with the trait controlling number of seeds produced per pod (nspp). The objective of this study was to construct a high resolution map of a chromosomal region controlling narrow leaflet trait and nspp in soybean. A BC3F2 population from a cross between 'Sowonkong' and 'V94-5152' was used. Sowonkong have narrow leaflet and 4-seeded pod and V94-5152 have ovate leaflet and do not have 4-seeded pod. The plants of F2 populations showed a segregation ratio of 3:1 of ovate leaflet to narrow leaflet and then leaflet genotypes were obtained from F2:3 population of each F2 individual. The narrow leaflet-containing plants showed Sowonkong-like pod trait and the ovate leaflet-containing plants V94-5152-like pod trait. The results suggested that, in our mapping population, a single gene controls inheritance of the narrow leaflet character and the narrow leaflet trait is tightly linked to or co-segregating with the trait controlling nspp. Subsequently, we mapped the narrow leaflet locus near Sat_105, Satt270 and SM315 on soybean linkage group I that corresponds with the previously known ln locus. Work is ongoing to construct a fine molecular genetic linkage map on this MLG I region and to find a linkage relationship between ln and nspp. Our results should facilitate further elucidation for the relationship between ln/nspp and yield.
Multiple genes confer resistance to soybean mosaic virus in the soybean cultivar Hwangkeum
Jeong, Namhee,Jeong, Soon-Chun Cambridge University Press 2014 Plant genetic resources Vol.12 No.1
<P>Recombinant inbred lines (RILs) generated from a cross between a cultivated species and its wild progenitor species serve as important germplasm for introgressing valuable genes from a wild species to a cultivated species. During this breeding process, it is equally important to prevent the loss of agronomically important genes in the cultivated species. In an effort to establish an efficient selection system for the single <I>Rsv</I>1 gene conferring durable resistance to soybean mosaic virus (SMV) in the soybean cultivar Hwangkeum (also known as Suweon 97), which is a parent of a RIL population from Hwangkeum (cultivated soybean) × IT182932 (wild soybean), in the present study, we unexpectedly identified an additional necrosis-conditioning gene unmasked by a recombination in the middle of the <I>Rsv</I>1-containing nucleotide-binding leucine-rich repeat gene cluster region and the <I>Rsv</I>3 gene in Hwangkeum. Thus, Hwangkeum contains at least three SMV resistance genes consisting of two tightly linked genes at the <I>Rsv</I>1 locus and the <I>Rsv</I>3 locus. The results of this study provide additional important information for use of the Hwangkeum genome in soybean breeding programmes.</P>