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- 검색키워드
- 저자 : Jong-tag Youn (검색결과 28 건)
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Waterlogging Effects on Nitrogen Accumulation and $N_2$ Fixation of Supernodulating Soybean Mutants
Youn, Jong-Tag,Van, Kyu-Jung,Lee, Jae-Eun,Kim, Wook-Han,Yun, Hong-Tae,Kwon, Young-Up,Ryu, Yong-Hwan,Lee, Suk-Ha The Korean Society of Crop Science 2008 Journal of crop science and biotechnology Vol.11 No.2
Soybean is sensitive to waterlogging stress, leading to reduce their growth and yield significantly. The objective of this study was to characterize the relative sensitivities of biomass accumulation and specific nodule activity under waterlogging stress between supernoduating mutants, 'SS2-2' and 'Sakukei 4' and their wild-type soybeans, 'Sinpaldalkong 2' and 'Enrei', respectively. Flooding treatment was performed to soybean plants grown in a pot by waterlogging for 15 days from the beginning bloom(R1) stage under natural light. The nodule number and weight were considerably decreased by waterlogging stress. The bleeding sap rate of waterlogging soybean plants was decreased by 78-80% in supernodulating mutants and 65-74% in their wild types compared to control plants. The relative ureide-N content was also decreased by waterlogging and the reduction was high in supernodulating mutants. This may cause the massive reduction of shoot and root dry weight and leaf area in waterlogged soybean plants. There was a varietal difference in response to the waterlogging stress. During the waterlogging, supernodulating mutants maintained higher spad value than their wild types. Particularly, the difference between soybean varieties was clear in low rank leaves from the top. Also, supernodulating mutants showed a weak waterlogging tolerance than their wild types. Under waterlogging conditions, massive nodules were considerably destroyed and specific nodule activity after waterlogging may not be recovered when compared to their wild-type soybeans. Supernodulating mutants showed lower seed yield than their wild types in waterlogging conditions.
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Jong-Nae Hyun,Chon-Sik Kang,Jae-Bok Hwang,Ki-Yeol Chung,Young-Dae Choi,Jong-Tag Youn,Eul-Soo Yun,Jee-Yeon Ko,Ji-Yeon Kim,In-Seok Oh,Sang-Jong Lim 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Wheat is one of the most important food crops in the world and provides 20% of nutritional requirement to the consumers in developing countries. The consumption per capita of wheat is persistent but the self-sufficiency has decreased owing to the less competitive world market and double cropping system with rice in Korea. This study was conducted to obtain baseline data on the selection lines with early maturity and good agronomic traits. Geumgangmil, a leading Korean variety, was crossed with CIMMYT’s line, and a DH (double haploid) line was released using pollens of Maize in Mexico. The 71 inbred lines were grown in fields at NICS, Miryang. The culm length of inbred lines were normally distributed from 37cm to 106cm, though that of the P1 (Geumgangmil) was 71 and P2 (CIMMYT’s Line) was 77cm. Especially, some lines were very short and measured below 50cm. The spike lengths of most of the lines were longer than that of P1 (7.5cm), but were normally distributed. The number of spikelet was less than that in P2 (19ea.), but was more than P1(10ea.). The heading day of most of the lines was between P1 (11th April) and P2 (25th April) and the maturity day of the lines was similar to P1 (1st June) but 5 lines showed 2~6 days shorter maturity period than that of P1. However, 20 lines were found to have 2~10 days longer maturity period than that of P2.
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Youn, Jong-Tag,Van, Kyu-Jung,Ryu, Yong-Hwan,Shimada, Shinji,Lee, Choon-Ki,Kim, Sun-Lim,Seo, Sea-Jung,Lee, Suk-Ha The Korean Society of Crop Science 2008 Journal of crop science and biotechnology Vol.11 No.1
Improvement of $N_2$ fixation by symbiotic rhizobia is considered an effective means for enhancing its productivity without high input of nitrogen(N) fertilizer. Several methods to improve $N_2$ fixation have been proposed including the use of supernodulating mutants. The objective of this research was to identify the varietal difference in N and $N_2$-fixation ability among the soybean supernodulating mutants, SS2-2 and Sakukei 4, with different nodulation abilities using $^{15}N$ in field conditions in both Korea and Japan. The dry weight(DW) was higher in wild-type soybeans. The distribution rate of DW in each plant part was high in seeds of supernoduating and wild-type soybeans but high in stems and leaves of non-nodulating mutants. Although the supernodulating mutants had a low DW rate at maturity, they showed a similar $N_2$ fixation ability compared with wild-type. Supernodulating mutant plants mainly obtained N from $N_2$ fixation, while soil N was the main resource for obtaining N in non-nodulating mutants. The percentage of N derived from atmospheric dinitrogen(Ndfa) was higher in supernodulating mutants than in wild-type and relatively high in seeds between plant parts at maturity. In particular, supernodulating mutants showed higher N content in roots than those of wild-type and non-nodulating mutants. It was considered that supernodulating mutants have the advantage of saving nitrate in soil and being beneficial for N absorption of subsequent crops due to their conserving more N in the field and releasing considerable amounts of N from roots and leaves fallen to the soil.
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Jong-Tag Youn,반규정,Yong-Hwan Ryu,Shinji Shimada,Choon-Ki Lee,김선림,Sea-Jung Seo,이석하 한국작물학회 2008 Journal of crop science and biotechnology Vol.11 No.1
Improvement of N2 fixation by symbiotic rhizobia is considered an effective means for enhancing its productivity without high input of nitrogen (N) fertilizer. Several methods to improve N2 fixation have been proposed including the use of supernodulating mutants. The objective of this research was to identify the varietal difference in N and N2-fixation ability among the soybean supernodulating mutants, SS2-2 and Sakukei 4, with different nodulation abilities using 15N in field conditions in both Korea and Japan. The dry weight (DW) was higher in wild-type soybeans. The distribution rate of DW in each plant part was high in seeds of supernoduating and wild-type soybeans but high in stems and leaves of non-nodulating mutants. Although the supernodulating mutants had a low DW rate at maturity, they showed a similar N2 fixation ability compared with wild-type. Supernodulating mutant plants mainly obtained N from N2 fixation, while soil N was the main resource for obtaining N in non-nodulating mutants. The percentage of N derived from atmospheric dinitrogen (Ndfa) was higher in supernodulating mutants than in wild-type and relatively high in seeds between plant parts at maturity. In particular, supernodulating mutants showed higher N content in roots than those of wild-type and non-nodulating mutants. It was considered that supernodulating mutants have the advantage of saving nitrate in soil and being beneficial for N absorption of subsequent crops due to their conserving more N in the field and releasing considerable amounts of N from roots and leaves fallen to the soil.
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Jong-Tag Youn,반규정,Jae-Eun Lee,Sung-Kook Kim,Jin Song,김욱한,이석하 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.3
Increased application of nitrogen (N) fertilizer top-dressing during growth is an effective option for enhancing N supply to soybeanplants. SS2-2 was characterized by the superior ability of symbiotic N2 fixation at the level of 30 kg N ha-1. But, the response ofnitrogen fixation ability of supernodulating soybean mutant, SS2-2, to N fertilizer application rate remains unclear. The objective ofthis experiment was to compare the response of N fertilizer top-dressing on N accumulation and N2 fixation between supernodulatingmutant, SS2-2, and wild-type, Sinpaldalkong 2. The effect of N fertilizer top-dressing (0.6 g N pot-1 top-dressing) on the nitrogenaccumulation and redistribution were compared between SS2-2 and Sinpaldalkong 2. N fertilizer top-dressing at R1 stage increase inplant dry weight, relative growth rate (RGR), net assimilation rate (NAR), nitrogen harvest index (NHI), and N redistribution (NR). SS2-2 showed highest N concentration, 65.0 mg N g DW-1, followed by Sinpaldalkong 2 and En1282, and the N content per plant didnot show a significant difference between SS2-2 and Sinpaldalkong 2. The N2 fixation rate was significantly reduced by N top-dressing,but the amount of N2 fixation was not changed due to an improved dry weight without changes of N concentration. In addition,SS2-2 showed higher NHI, NR and NRE than Sinpaldalkong 2. These results suggested that supernodulating soybean mutants, SS2-2, could be characterized by high N concentration and N2 fixation regardless of N fertilizer top-dressing due to a higher nitrate toleranceof supernodulating mutants than that of wild-type.
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Waterlogging Effects on Nitrogen Accumulation and N₂ Fixation of Supernodulating Soybean Mutants
Jong-Tag Youn,반규정,이재은,김욱한,Hong-Tae Yun,Young-Up Kwon,Yong-Hwan Ryu,이석하 한국작물학회 2008 Journal of crop science and biotechnology Vol.11 No.2
Soybean is sensitive to waterlogging stress, leading to reduce their growth and yield significantly. The objective of this study was to characterize the relative sensitivities of biomass accumulation and specific nodule activity under waterlogging stress between supernoduating mutants, 'SS2-2' and 'Sakukei 4' and their wild-type soybeans, 'Sinpaldalkong 2' and 'Enrei', respectively. Flooding treatment was performed to soybean plants grown in a pot by waterlogging for 15 days from the beginning bloom (R1) stage under natural light. The nodule number and weight were considerably decreased by waterlogging stress. The bleeding sap rate of waterlogging soybean plants was decreased by 78-80% in supernodulating mutants and 65-74% in their wild types compared to control plants. The relative ureide-N content was also decreased by waterlogging and the reduction was high in supernodulating mutants. This may cause the massive reduction of shoot and root dry weight and leaf area in waterlogged soybean plants. There was a varietal difference in response to the waterlogging stress. During the waterlogging, supernodulating mutants maintained higher spad value than their wild types. Particularly, the difference between soybean varieties was clear in low rank leaves from the top. Also, supernodulating mutants showed a weak waterlogging tolerance than their wild types. Under waterlogging conditions, massive nodules were considerably destroyed and specific nodule activity after waterlogging may not be recovered when compared to their wild-type soybeans. Supernodulating mutants showed lower seed yield than their wild types in waterlogging conditions. Soybean is sensitive to waterlogging stress, leading to reduce their growth and yield significantly. The objective of this study was to characterize the relative sensitivities of biomass accumulation and specific nodule activity under waterlogging stress between supernoduating mutants, 'SS2-2' and 'Sakukei 4' and their wild-type soybeans, 'Sinpaldalkong 2' and 'Enrei', respectively. Flooding treatment was performed to soybean plants grown in a pot by waterlogging for 15 days from the beginning bloom (R1) stage under natural light. The nodule number and weight were considerably decreased by waterlogging stress. The bleeding sap rate of waterlogging soybean plants was decreased by 78-80% in supernodulating mutants and 65-74% in their wild types compared to control plants. The relative ureide-N content was also decreased by waterlogging and the reduction was high in supernodulating mutants. This may cause the massive reduction of shoot and root dry weight and leaf area in waterlogged soybean plants. There was a varietal difference in response to the waterlogging stress. During the waterlogging, supernodulating mutants maintained higher spad value than their wild types. Particularly, the difference between soybean varieties was clear in low rank leaves from the top. Also, supernodulating mutants showed a weak waterlogging tolerance than their wild types. Under waterlogging conditions, massive nodules were considerably destroyed and specific nodule activity after waterlogging may not be recovered when compared to their wild-type soybeans. Supernodulating mutants showed lower seed yield than their wild types in waterlogging conditions.
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윤종탁 ( Jong Tag Youn ),김정태 ( Jung Tae Kim ),박효진 ( Hyo Jin Park ),김선림 ( Sun Lim Kim ),김시주 ( Si Ju Kim ),권영업 ( Young Up Kwon ),정일민 ( Ill Min Chung ),김미정 ( Mi Jung Kim ) 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.2
This study was carried out to promote the soybean curd color of the green cotyledon soybeans, Cheongdu 1 and Cheongja 3. Vegetables, chinese leek, mugwort, pine needle, spinach and water dropwort, were added to soybean curd for promoting the greenness. The L (lightness) and a (redness) values of the soybean curd were significantly decreased by the vegetables adding. Spinach adding was more effective to promote greenness of soybean curd than other vegetables. The L and a values of the Green Soybean Curd (GSC) were significantly decreased by spinach adding, whereas chlorophyll, carotenoid and crude fiber contents were greatly increased. In textural properties, GSC in Cheongdu 1 was significantly changed hardness, gumminess, cohesiveness and chewiness by spinach adding, but the changing values of Cheongja 3 were relatively slight. In the sensory evaluation, GSC with spinach adding had low scores all sensory items, therefore the spinach adding in GSC was considered to have negative effect on the consumers favorites. The obtained results suggest that the spinach adding in GSC need to re-control for promoting the greenness and consumer acceptability.
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