• KOREAN JOURNAL OF CROP SCIENCE
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• v.25 no.1
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• pp.87-91
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• 1980

The competitiveness of 7 soybean (Glycine max (L) Men.) cultivars to weeds were studied. The two soybean cultivars that showed the greatest competitiveness to weeds by maintaining their yields were Suweon 83 and Dongbuktae; whereas the least competive were Columbus and Harosoy.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.4
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• pp.324-331
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• 1981

Sixty five soybean varieties were tested to observe varietal response and to get the basic data for resistant variety breeding to soybean cyst nematode (Heterodera glycines I.). They were classified into five groups, from the most resistant to the most susceptible by decreasing rate of seed weight. A few Korean varieties were included in the most resistant group. In general, early maturing varieties were more susceptible. Total plant weight could be used as an important criterion to select a resistant variety to soybean cyst nematode.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.25 no.4
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• pp.66-72
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• 1980

Forth soybean (Glycine max (L.) Merr.) cultivars were evaluated to determine the extent of crop injury caused by differential sensitivity of cultivars to two rates of alachlor, linuron, and metribuzin. Most cultivars were relatively tolerant of alachlor at 120 and 240g/10a and also linuron at 62.5 and 125g/10a. However, many cultivars were highly sensitive to metribuzin at 50 and 100g/10a. Some of the most sensitive cultivars were ‘Kyungnam 2’, ‘Toyosuzu’, ‘Noki 1’, ‘Iwade 2’, and ‘Hampton’. Metribuzin also showed a very narrow margin of safety to soybean cultivars.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.4
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• pp.345-352
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• 1989

The immunochemical property of lectin in soybean and the presence of lectin in seeds of six soybean cultivars were investigated by immunochemical methods. All seeds of six soybean cultivars formed one precipitin line against the soybean lectin antibody and showed immunochemically homologous precipitin pattern among the cultivars in immunodouble diffusion test. Four antigenic components in soybean lectin were detected by the crossed imuno-electrophoresis of a soybean seed antigen against the soybean lectin antibody. Cultivar, Jangyeop-kong contained the highest amount of lectin and the next were Kwangkyo, Hwangkeumkong, Baegunkong, and Jangbaegkong or Paldal-kong in order of lectin content. The lectin purified from the seeds of six soybean cultivars agglutinated rabbit erythrocytes, but did not agglutinate the fungal spores which were Fusarium sp., Alternaria sp., Cuvalaria sp., and Colletotrichum sp. isolated from the infected seeds or leaves of soybean.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.2
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• pp.179-184
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• 1981

The study was conducted to know the differential growth responses of soybean cultivars as affected by various application stages of Metribuzin herbicide, at the University experimental farm of Chonnam Nat'l. Univ, Kwangjoo, 1980. Experimented soybean materials were six cultivars, as Kwanggyo, Dongbuktae, Bongui, Yukwoo 3, Suweon 85, and Suweon 86., . and Laid-out application stages were five as pre-sowing, Pre-emergence, Early Post-emergence, and Late Post-emergence treatment comparing with Control. Results obtained from the study were as follows: Among experimented soybean cultivars, no significantly tolerant cultivar was shown. Highly significant differences in phytotoxicities by Metribuzin treatments were detected among various application stages, and crop tolerances were recognized bigger in order as E. Post-emg. < L. Post-emg. $\ll$ Pre-emg. < Pre-sowing $\leq$ Control. The phytotoxic symptoms of all soybean cuitivars were severely recorded in order of Leaf No. /Plant < Plant height $\ll$ Branch No. /Plant. For the cultivation of most soybean cuitivars, the use of Metribuzin in Pre-sowing or Pre-emergence were recommended, and especially it is expected to follow of more detailed study on soil-incorporation method in Pre-sowing treatment, and rather the tank-mixture system of Metribuzin with others than the mono-application system for the safe-use and enlargement of weeding-spectrum.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.2
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• pp.167-173
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• 1981

Respiration of whole seeds and seed parts isolated from four soybean varieties Essex, Pickett, Wayne and Bonus as measured at $25^{\circ}C$ during germination. The average respiration rates of cotyledons were significantly higher than those of other parts. The values were 35.7, 28.0 and $23.9{\mu}hr^{-1}$ seed$^{-1}$ for cotyledons, embyros, and hila, respectively. Bonus showed a significantly lower respiration rate than the other varieties did. The interaction of variety x seed part was not significant source of variation for respiration. This suggests that seed part and variety independently contribute to soybean seed respiration during early imbibition. The effects of imbibition time and time x variety intereaction on whole seed respiration were significant, but the variety effect was not significant. The correlation coefficient between seed moisture content and respiration after 24 hours of imbibition was significant for Bonus, but not for the other varieties tested. This suggests that Bonus may require more water for respiration during imbibition than the other varieties. There as no significant correlation of whole seed respiration rate after 24 hours imbibition with seed weight or seedling length.

• Korean Journal Plant Pathology
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• v.2 no.3
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• pp.199-206
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• 1986

Penetration level, female development and histological changes in infected root tissues were investigated following inoculation with different inoculum levels (110,440 and 1760 juveniles/plant) of Heterodera glycines (SCN) race 3 on susceptible 'Lee' and resistant 'Pickett' soybean cultivars. Penetration level was lower in Pickett at the higher inoculum levels but no differences were detected in Lee. However, the lower penetration level in the resistant soybean cultivar appeared not to be directly related to plant resistance (female maturation). The number of females recovered from Lee was lower at the highest inoculum level. The number of females maturing on Pickett was much less than that on Lee, showing that changes of SCN population is associated with the number of SCN maturing rather than nematode penetration. In Lee mono-infection sites (a single nematode per site) syncytia had dense cytoplasm and no central vacuoles. while multi-infected sites (many overlapping nematodes per site) had syncytia with a large central vacuole and many small vacuoles. Resistant responses in mono-and multi-infected root tissues of Pickett were delayed and rapid necrosis, respectively. The differences in tissue response are suggested as a mechanism that controls density-dependent population changes in resistant and/or susceptible soybean cultivars.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.23 no.2
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• pp.113-117
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• 1978

An attempt was made to establish a mass-screening technique for resistance to purple seed stain .disease in soybean. Seeds sterilized in 1 : 10000 'mercuric chloride for 1 minute and transffered to Petridishes containing 20ml water agar plus 50ppm of the sodium salt of 2,4-D were inoculated by placing a small agar cube containing fungal mycelium on the seed coat of each seed. A positive correlation between natural infection of purple seed :stain and purple discoloration by seed inoculation technique was highly significant and by this technique, some native soybean collections and introduced varieties were tested for resistance to the disease. Most of the soybean varieties tested were susceptible except for the varieties Hill, Harosoy and Sac, resistant comparatively.

• Korean Journal Plant Pathology
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• v.3 no.4
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• pp.245-251
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• 1987

Soybean cultivars were inoculated with mixtures of races 3 and 4 of the soybean cyst nematode(SCN), Heterodera glycines Ichinohe. On a susceptible soybean cultivar Lee, the relative female maturation of the race mixture was not significantly different when compared with the maturation potentials for each of the two races alone. However, female maturation was significantly lower for the mixture than' for race 4 alone on the soybean cultivas Pickett and Mack which are susceptible to only race 4. Selection of SCN populations consisting of race 3 and race 4 resulted in a decrease in race 4 on soybean cultivars Lee and Bragg which are susceptible to all SCN races and an increase in race 4 on soybean cultivars Pickett and Peking which are susceptible to only race 4. A significant reduction of race 4 was also observed on Lee with most mixtures of race' 3 and race' 4 combined in several ratios, suggesting that race 3 was more competitive than race 4 on the susceptible soybean.

• Applied Biological Chemistry
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• v.32 no.2
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• pp.116-125
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• 1989

Bowman-Birk type protease inhibitors of soybeans were purified with gel filtration on Sephadex G-75. Significant differences were found in the content and in the electrophoretic patterns of the purified protease inhibitors. Ten among fourteen electrophoretic bands appeared as protease inhibitors. The chymotrypsin and trypsin inhibiting activities in soybeans showed three and four fold variation respectively. And the cultivars with higher chymotrypsin inhibiting activities seemed to have higher cysteine contents.