• Title/Summary/Keyword: soybean breeding

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Isolation and Characterization of Rhizobia from Soybean Cultivated in Korea (대두(大豆) 근류균(根瘤菌)의 분리(分離) 및 특성(特性))

  • Yun, Han-Dae;Cho, Moo-Je;Lee, Ke-Ho
    • Applied Biological Chemistry
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    • v.30 no.2
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    • pp.153-162
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    • 1987

  • Soybean rhizobia were isolated from 101 soybean (Glycine max.) cultivar which had been grown for the breeding experiment in Korea. Seven strains of the fast-growing soybean rhizobia and nine strains of the slow-growing soybean rhizobia were selected on the basis of their growth rate in AMA medium and their high ability of nodulation. The slow-growing soybean rhizobia were identified as Bradyrhizobium japonicum in the acetylene-reducing activity, microbial characteristics, and biochemical characteristics whereas the fast-growing soybean rhizobia were very similar to Rhizobium fredii.

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Analysis of genome variants in dwarf soybean lines obtained in F6 derived from cross of normal parents (cultivated and wild soybean)

  • Roy, Neha Samir;Ban, Yong-Wook;Yoo, Hana;Ramekar, Rahul Vasudeo;Cheong, Eun Ju;Park, Nam-Il;Na, Jong Kuk;Park, Kyong-Cheul;Choi, Ik-Young
    • Genomics & Informatics
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    • v.19 no.2
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    • pp.19.1-19.9
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    • 2021

  • Plant height is an important component of plant architecture and significantly affects crop breeding practices and yield. We studied DNA variations derived from F5 recombinant inbred lines (RILs) with 96.8% homozygous genotypes. Here, we report DNA variations between the normal and dwarf members of four lines harvested from a single seed parent in an F6 RIL population derived from a cross between Glycine max var. Peking and Glycine soja IT182936. Whole genome sequencing was carried out, and the DNA variations in the whole genome were compared between the normal and dwarf samples. We found a large number of DNA variations in both the dwarf and semi-dwarf lines, with one single nucleotide polymorphism (SNP) per at least 3.68 kb in the dwarf lines and 1 SNP per 11.13 kb of the whole genome. This value is 2.18 times higher than the expected DNA variation in the F6 population. A total of 186 SNPs and 241 SNPs were discovered in the coding regions of the dwarf lines 1282 and 1303, respectively, and we discovered 33 homogeneous nonsynonymous SNPs that occurred at the same loci in each set of dwarf and normal soybean. Of them, five SNPs were in the same positions between lines 1282 and 1303. Our results provide important information for improving our understanding of the genetics of soybean plant height and crop breeding. These polymorphisms could be useful genetic resources for plant breeders, geneticists, and biologists for future molecular biology and breeding projects.

  • https://doi.org/10.5808/gi.21024 인용 PDF KSCI

Growth and Textural Properties of the Sprouts of Soybean Groups with Different Seed Size (종자 크기가 다른 콩 종류의 콩나물 생장과 물성)

  • Hwang, Seung-Pil;Park, Euiho
    • Korean Journal of Breeding Science
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    • v.43 no.4
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    • pp.311-317
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    • 2011

  • This experiment was conducted to give basic information to sprout-soybean breeding and automated sprout production by investigating the effect of seed size on the sprout growth and texture. Twenty cultivars and lines including large and medium soybean, small interspecific cultivars and extra-small wild soybean lines were used. Seeds were cultured for 4 days using small sprout-culturing kits. Hypocotyl length of large Hwanggeumkong, small Pungsannamulkong and Soyoung were longer and wild soybean lines were shorter than other cultivars. Fresh sprout weight and growth rate per unit dry seed weight of wild soybean lines ware increased dramatically and more than other cultivars between 48 to 72 hours after culture. Not only the increasing rate but sprout yield ratio to used dry seed weight showed the negative relationship pattern with seed size. The hardness of hypocotyl in Jangyeubkong, mastication in Taekwang, and cutting force in Eunhakong were the highest as 3,505 g, 1,650 g, and 133 g respectively, and texture values of these traits in wild soybean YWS516 were the lowest. Cutting force of soybean hypocotyl showed the positive relationship pattern with seed size. Breaking force of hypocotyl in large Jangyeobkong was the highest as 83.5g and wild soybean lines were the lowest showing the same pattern as other textural characters.

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Variation in Pod Shattering in a RIL Population and Selection for Pod Shattering Tolerance in Soybean [Glycine max (L.) Merr] (콩 RIL 집단의 내탈립성 변이 탐색 및 유망계통 선발)

  • Seo, Jeong Hyun;Kang, Beom Kyu;Kim, Hyun Tae;Kim, Hong Sik;Choi, Man Soo;Oh, Jae Hyeon;Shin, Sang Ouk;Baek, In Youl;Kwak, Do Yeon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.64 no.4
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    • pp.414-421
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    • 2019

  • Pod shattering during the maturing stage causes a serious yield loss in soybean. It is the main limiting factor of soybean cultivation and mechanization. It is important to develop varieties suitable for mechanical harvesting and to develop energy-efficient agricultural machinery to save labor and costs. 'Daewonkong,' developed by the National Institute of Crop Science (NICS) in 1997, is an elite cultivar that occupies more than 80% of the soybean cultivation area in Korea because of its strong tolerance to pod shattering. The objectives of this study were to investigate the variation in pod shattering degree in a RIL population developed from a 'Daewonkong' parent and to select promising lines with pod shattering tolerance. 'Daewonkong' demonstrated a high level of tolerance to pod shattering compared to the 'Tawonkong' and 'Saeolkong' varieties, with no shattered pods after 72 hours of drying. Screening of pod shattering showed a clear distinction between the tolerant and susceptible varieties. Also, the distribution of shattering pod ratio in the two populations showed a similar pattern for three years. The promising lines with pod shattering tolerance included 27 lines in the 'Daewonkong'×'Tawonkong' population and 21 lines in the 'Daewonkong'×'Saeolkong' population. The promising lines are expected to be widely used as breeding parents for creating soybean cultivars with pod shattering tolerance.

  • https://doi.org/10.7740/kjcs.2019.64.4.414 인용 PDF KSCI