• Korean Journal of Agricultural and Forest Meteorology
• /
• v.15 no.1
• /
• pp.26-39
• /
• 2013

Yield reduction in major cereal grains seems unavoidable with the existing cropping systems under the projected climate change in Korea. Crop models were used to predict the effects of planting date shift on grain yields of rice, winter barley and soybeans at 64 agroclimatic zones in Korea. The shift of planting date by 7, 14, and 21 days before and after the recommended planting dates were incorporated in DSSAT experiment files to simulate growth, development and grain yields of major cereal crops. These included 3 rice cultivars representing early-, medium- and late-maturity groups, 1 winter barley and 1 soybean cultivars. Partial mitigation in yield reduction was found with earlier planting in the early maturing rice cultivar and with delayed planting in the late maturing rice cultivar under the RCP8.5 projected climate change in Korea. Additional yield increase in winter barley was expected by earlier planting treatments. Soybean showed a positive effect on grain yield with earlier planting. However, the rate was much lower than the case with winter barley and delayed planting caused yield reduction.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.50 no.spc1
• /
• pp.112-117
• /
• 2005

This study was conducted to see the feasibility of breeding for sprout soybean cultivar with minimum benny flavor using lipoxygenase-less lines. Lipoxygenase-less cultivar Jinpumkong2 was crossed by lipoxygenase containing Gwangankong, Sebaeknamulkong, and Pureunkong as paternal parent and 24 lipoxygenase-less lines derived from those 3 combinations were selected and those lines were evaluated with their parental cultivars. Germination rate showed no difference between lipoxygenase-less lines and their parental cultivars, however, rates of normal sprout of those and Jinpumkong2 were 63 and $56\%$, and were lower than that of paternal parents. Hypocotyl length of those was same as Jinpumkong2, however, shorter than paternal parents. Texture characteristics including hardness, cutting force and mastication of 96 hour-cultured sprout of lipoxygenase-less lines showed higher value than that of their parental cultivars. Lipoxtgenase isozyme was not detected in the sprout cotyledon of lipoxygenase-less lines, however it was observed in the sprout hypocotyl of all the used genotypes. Though lipoxygenase activity in the seed of lipoxygenase-less lines was lower than that of Jinpumkong2(0.477, ${Delta}A$ 234 nm min-1 mg meal-1),2 lines revealed more than 0.5 value. Lipoxygenase-activity of 2 day-cultured sprout(both cotyledon and hypocotyl) was the highest, decreased in 3 days after culture and re-increased thereafter. Several lipoxygenase-less lines with lower lipoxygenase activity of sprout than Jinpumkong2 were selected and this suggested the possibility of breeding lines for soy-sprout with low benny flavor.

• Korean journal of applied entomology
• /
• v.22 no.3 s.56
• /
• pp.208-212
• /
• 1983

Sixteen recommended soybean cultivars in Korea were tested for resistance to Heterodera glycines. The nubmer of females which developed on roots of cultivars were fewer on 'Hwanggeum kong' and greater on 'Geumgangdaelib'. But there was no resistant cultivar to Heterodera glycines. Four field populations of Heterodera glycines tested for ability to reproduce on five host differentials. Geographical differentiations of H. glycines were newly founded in Korea. These were identlified to race 1 at Hwasun, race 5 at Yangsan and Suweon and Unknown race(or race C) at Seonsan.

• Korean journal of applied entomology
• /
• v.38 no.3
• /
• pp.249-253
• /
• 1999

To study races of Heterodera glycines in Korea, 21 soil samples were collected from eight provinces in 1995. Four races were found; race 3(48%) was a dominant race flowed by race 5(24%), race 1(19%), and race 6(9%). About 30~40% of H. glycines populations reproduced on Pickett and PI88788, while non reproduced on Peking or PI90763. Development of resistant soybean cultivar targeting to race 5 and 6 of H. glycines using PI90763 and PI88788 as a parent is recommended.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2022.10a
• /
• pp.188-188
• /
• 2022

Our previous study identified a resistance locus to Phytophthora sojae (isolate 2457) in an interval of 3.8-4.7 Mbp on chromosome 3 via genetic mapping using a 'Daepung'×'Daewon' recombinant inbred population. Since differential gene expression between Daepung (susceptible) and Daewon (resistant) after inoculation of P. sojae is unknown, RNA sequencing was carried out to compare transcriptomic changes between the two genotypes following inoculation with P. sojae isolate 2457. The two varieties were inoculated using hypocotyl inoculation at the VC stage and stem tissue of 1 cm above and below of the inoculated site were sampled at 0, 6, 12 hours after inoculation (hai), respectively. Differentially expressed genes (DEGs) under same cultivar in different time point and Daepung vs. Daewon in same time point were investigated. In comparison of Daepung vs. Daewon at 12 hai, a total of 3,513 DEGs were identified, including two nucleotide-binding site-leucine rich repeat (NBS-LRR) genes (Glyma.03g034800 and Glyma.03g034900) that are located in the previously reported resistance locus on chromosome 3. In addition, 14,966 DEGs were detected between 0 vs. 6 hai, containing one of candidate genes (Glyma.03g035300). This gene was upregulated by up to 4-fold in Daewon and Daepung. Additional results will be further discussed in the presentation. This study will provide valuable information for soybean crop improvement.

• Korean Journal of Microbiology
• /
• v.49 no.1
• /
• pp.71-77
• /
• 2013

This study was carried out to investigate the characteristics of Chungkookjang depending on different soybeans and fermentation temperatures using Bacillus amyloliquefaciens C2 isolated from homemade Chungkookjang. The highest protease activity was 854 U/g in yellow soybean Chungkookjang and 847 U/g in black soybean Chungkookjang at $35^{\circ}C$. The highest amylase activity was 3.87 U/g at $40^{\circ}C$ in yellow soybean Chungkookjang and 4.96 U/g at $45^{\circ}C$ in black soybean Chungkookjang. The highest reducing sugar content was 16.11 mg/g at $40^{\circ}C$ in yellow soybean Chungkookjang and 19.08 mg/g at $45^{\circ}C$ in black soybean Chungkookjang. The highest amino type nitrogen content was 420 mg%/g in yellow soybean Chungkookjang and 194 mg%/g in black soybean Chungkookjang at $40^{\circ}C$. The highest pH was 7.92 at $40^{\circ}C$ in yellow soybean Chungkookjang and 7.59 at $45^{\circ}C$ in black soybean Chungkookjang. The highest number of viable cell was 9.3 log CFU/g at $40^{\circ}C$ in yellow soybean Chungkookjang and at $35^{\circ}C$ in black soybean Chungkookjang. On the other hand, the lowest ammonia type nitrogen content was 225 mg%/g at $45^{\circ}C$ in yellow soybean Chungkookjang and 80 mg%/g at $40^{\circ}C$ in black soybean Chungkookjang. Yellow soybean Chungkookjang showed high protease activity, pH and amino type nitrogen, whereas black soybean Chungkookjang showed high amylase activity and reducing sugar.

• Korean Journal of Breeding Science
• /
• v.51 no.4
• /
• pp.496-503
• /
• 2019

The soybean cultivar, 'Saegeum', has been developed for preparing soy-paste and tofu. The soybean cultivars 'Daepung' and 'SS98207-3SSD-168' were crossed in 2003 to obtain 'Saegeum'. Single seed descent method was used to advance the generation from F₃ to F₅, and the plant lines with promising traits were selected from F₆ to F₇ by pedigree method. The preliminary yield (PYT) and advanced yield trials (AYT) were conducted from 2009 to 2010, and the regional yield trial (RYT) was conducted in 12 regions between 2011 and 2013. The morphological characteristics of 'Saegeum' were as follows: determinate plant type, white flower, tawny pubescence color, and brown pod color. Flowering and maturity dates were August 2, XXXX and October 17, XXXX, respectively. Plant height, first pod height, number of nodes, number of branches, and number of pods were 79 cm, 18 cm, 16, 2.3, and 44, respectively. The seed characteristics of 'Saegeum' were as follows: yellow spherical shape, yellow hilum, and the 100-seed weight was 25.4 g. 'Saegeum' was resistant to bacterial pustule and SMV in the field test, and its lodging resistance was mildly strong, whereas its shattering resistance was excellent. The ability of this cultivar to be processed into tofu, soybean malt, and other fermented products was comparable with that of 'Daewonkong'. The yield of 'Saegeum' in the adaptable regions was 3.02 ton ha^-1. Thus, 'Saegeum' is adaptable to mechanized harvesting because of its high first pod height, as well as lodging and shattering resistance. (Registration number: 5929)

• Korean Journal of Breeding Science
• /
• v.50 no.4
• /
• pp.478-484
• /
• 2018

A soybean cultivar "Chamol" for double cropping for use as soy-paste and tofu was developed using a pedigree method in 2011 as a cross between "Shinpaldal2" and "Keunol." A promising line, SS99502-2B-89-1-3-4-1-1, was selected and designated as "Milyang210". It was promising and showed good results from regional yield trials (RYTs) for 3 years from 2009 to 2011 and released with the name "Chamol." It has a determinate growth habit, white flowers, gray pubescence, yellow seed coat, yellow hilum, spherical seed shape, and large seeds (27.7 g per 100 seeds). The maturity date of "Chamol" was September 18 (100 day growing period) in RYT and it is suitable for double cropping with winter crops such as onion. "Chamol" was resistant to bacterial pustule and soybean mosaic virus and tolerant to lodging in fields. Furthermore, the average yield of "Chamol" was 2.51 ton/ha in the regional yield trials conducted for 3 years from 2009 to 2011.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.49 no.3
• /
• pp.216-221
• /
• 2004

Treatment effect of benzyladenopurine (BA) used to block the lateral roots formed on soybean sprouts should be influenced by its applying methods. This study was done to check the effects of temperature and period from seed imbibition into 2 ppm BA solution to the first watering for sprout culture on growth and morphology of soybean sprouts. Imbibed three cultivar (cv. Pungsannamulkong, Sowonkong and Junjery) seeds for 5 houys into 2 ppm BA solution were placed under different temperatures (AT; 20, 30, $40^{\circ}$) and periods (AP; 0, 1, 2, 3, 4 hours). On the 6th day, the soybean sprouts were classified by 4 categories on the base of hypocotyl length; ＞7cm, 4 to 7cm), ＜ 4cm and non-germination to calculate their composition rates, number of lateral roots, lengths of hypocotyl and root diameters at middle and hook of hypocotyl, and fraction dry weights were measured. Germination and growth responses of the cultivars were changed by AT and AP treatments. The responses, lateral root formation and fresh weights were, however, mainly affected by the cultivars used rather than Af treatment. Rate of the sprouts which formed lateral roots was decreased with increased periods to 4 hours, but their number per sprout was not different between the treatments of longer than 3 hours. Lengths of hypocotyl and root organ and total fresh weights were the highest in an hour AP treatment although longer than 3 hour AP treatments did not showed the significant difference in the lengths. Conclusionally AP treatment was more important than Af one in seed aeration for soybean sprout culture immediately after imbibition into BA solution, and was done at least for 3 hours.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.8 no.4
• /
• pp.242-249
• /
• 2006

Potential impacts of the future climate change on crop production can be inferred by crop simulations at a landscape scale, if the climate data may be provided at appropriate spatial scales. Northern Gyunggi Province is one of the few prospective regions in South Korea for growing quality soybeans. Any geographical shift of production areas under the changing climate may influence the current land planning policy in this region. A soybean growth simulation was performed at 342 land units in northern Gyunggi province to test the potential geographical shift of the current production areas for quality soybeans in the near future (form 2011 to 2100). The land units for soybean cultivation were selected by the land use, the soil characteristics, and the minimum arable land area. Daily maximum and minimum temperature, precipitation, the number of rain days and solar radiation were extracted for each land unit from the future digital climate models (DCM, 2011-2040, 2041-2070, 2071-2100). Daily weather data for 30 years were randomly generated for each land unit for each normal year by using a well-known statistical method. They were used to run CROPGRO-Soybean model to simulate the growth, phonology, and yields of 3 cultivars representing different maturity groups grown at 342 land units. According to the model calculations, the warming trend in this region will accelerate the flowering and physiological maturity of all cultivars, resulting in a 7 to 9 days reduction in overall growing season and a 1 to 15% reduction in grain yield of early to medium maturity cultivars. There was a slight increase in grain yield of the late maturing cultivar under the projected climate by 2070, but a decreasing tend was dominant by the year 2100.