Occurrence of Off-type Plants in japonica/indica Hybrid Rice Cultivars

Lee,Jeom-Ho,Jeon,Yong-Hee,Hwang,Hung-Goo 한국자원식물학회 2004 Plant Resources Vol.7 No.2

Frequent occurrence of off-type plants in a given cultivar has been a serious problem in both breeder s and farmer s fields. An experiment was designed to examine the differences in rate of occurrence of off-type plants among Tongil-type cultivars (high yielding cultivars derived from indica/japonica hybridization) from which the possible cause of higher occurrence of off-type plant in a specific cultivar was deduced. Among five Tongil-type cultivars examined for morphological variant in the field, only one cultivar, Dasanbyeo, had off-type plants. When analyzed with SSR markers, off-type plants showed different band patterns from original cultivar, having several extra bands in addition to cultivar-specific band, suggesting that off-type plants were originated from Dasanbyeo, rather than originated from mixing or mishandling of seed materials with other cultivars. The possible cause of off-type occurrence seems to be natural pollination with other cuItivars adjacent to the original cultivar during seed multiplication. This was supported from the observation that self-crossed progeny of the off type plants showed a wide range of variation of agronomic traits which could not be observed when there was a smaller introduction of genes to the fixed germplasm as happened in the case of cultivar mutation. Another evidence supported this idea that Dasanbyeo showed much of difference in floral organ and behavior to other cultivar to be subjected to higher out-crossing than other cultivars examined.

함평만 갯벌 조간대의 식생분포 및 현존량

이승호,이점숙,김종욱,김하송,임병선 木浦大學校 沿岸環境硏究所 1998 沿岸環境硏究 Vol.15 No.1

함평만 조간대 염생식물조사를 위하여 염생식물군락이 형성된 6개지역을 선정하여 식생분포 및 현존량을 조사하였다. 우점군락은 퉁퉁마디군락(Salicoenia herbacea community), 칠면초군락(Suaeda japonic community), 나문재군락(Suaeda asparagoides community), 좀보리사초군락(Carex pumilalini community), 가는갯능쟁이군락(Atriplex gmelini community), 갯개미취군락(Aster tripolium community), 갯잔디군락(Zoysia sinica community), 해홍나물군락(Suaeda maritima community), 갯질경군락(Limonium tetragonun community), 갈대군락(Phragmites communis community), 실망초군락(Erigeron bonariensis community)으로 구분되었다. 염생식물 군락의 생산량은 1,680∼2,170 g.d.w./㎡으로 갈대군락이 가장 높았고, 갯잔디 군락이 310∼500 g.d.w./㎡으로 가장 낮았다. The coastal vegetation was classified by the Braun-Blanquet's method and the biomass was investigated at the wetland of Hampyung-Man. The vegetation of the study area was classified with 11 coastal communities as follows: Salicornia herbacea community, Suaeda japonica community, Suaeda asparagoides community, Carex pumilalini community, Atriplex gmelini community, Aster tripolium community, Zoysia sinica community, Suaeda maritima community, Limonium tetragonun community, Phragmites communis community, Erigeron bonariensis community, Biomass was highest in Phragmites communis community (1,680∼2,170 g.d.w./㎡) and lowest in Zoysia sinica community (310∼500 g.d.w./㎡).

遮光이 두 大豆品種의 光合成 및 收量에 미치는 影響

柳點鎬,崔善英,金濟桓,李康壽 全北大學校 1993 論文集 Vol.35 No.-

In order to find out the influence of shading degree on the growth, pod setting, protein contents, RuBPCase activity, photosynthesis and yield in soybean plants, two soybean varieties, Hill and Etaka were cultivated under the 0%(full sun light), 20%, 65% and 90% shading conditions. Protein contents, RuBPCase activity and photosynthesis of leaves in Hill were decreased linearly with the higher shading, but those in Etaka were increased up to 20% shading, and then decreased more rapidly than Hill when the shading was above 65%. Pod sets were decreased with the higher shading degree, and those of the degree were severe in upper nodes. The stem heights were increased in accordance with the shading up to 65%, but stem diameter and No. of branches were decreased linearly with the higher shading degree. The yield of Hill was decreased linearly with the higher shading degree, but that of Etaka were increased up to 20% shading, and decreased inure severely than Hill when the shading was above 65%. From the above results : Etaka is more suitable than Hill to weak shading which occurred in the case of intercropping, companion cropping and alternating cropping, and the shading degree must not go over above 20%.

大豆에 있어서 生育初基의 斷水處理가 還元糖 및 α-amylase에 미치는 影響

柳點鎬,崔善英,李康壽 全北大學校 1988 論文集 Vol.30 No.-

In order to obtain the basic information for clarifying the mechanism of water stress, effects of water removal (15 days after emergence) on dry weight, chlorophyll and reducing sugar content, α-amylase activity and isozyme pattern were investigated in the early growth stage of soybean plant. The results are as follows. 1. Dry weight of shoot was increased in both the control and the treatment, but the degree of increase was remarkably lower in the treatment than that in the control. After 9 days of the treatment, it was decreased about 42% compared to the control. 2. Water content(%) and chlorophyll content in the leaves showed nearly unchanged in the control, but remarkable decrease in the treatment. After 9 days of the treatment, they came to 60% and to 4.5mg.g DW and decreased 26% and 42%, respectively, compared to the control. 3. Reducing sugar content and α-amylase activity in the leaves remained at almost constant level in the control, but showed almost linear increase in the treatment. After 9 days of the treatment, they came to 26mg/g DW and to 20 units, and reached about 2 and 1.6 times, respectively, compared to the control. 4. α-amylase isozymes showed only b (light stained) and c (dark stained) isozymes in the control and remained in color intensity during the period of investigation, while, in the treatment, a new a band was observed 3 days after the treatment, and a and b isozmes also became dark stained condition from 7 days after the treatment.

진동만 갯벌의 식생에 관한 연구

임병선,이점숙,김하송,이승호 목포대학교 연안환경연구소 2000 沿岸環境硏究 Vol.17 No.1

The coastal vegetation was classified by the Braun-Blanquet's method and the biomass was investigated at the wetland of Jindong-Man. The vegetation of the study area was classified with 6 coastal communities as follows : Phragmites communis community, Zoysia sinica community, Suaeda japonica community, Artemisia fukudo community, Carex scabrifolia community and Salicornia herbacease community. Biomass was highest in Phragmites communis community (3,639g.d.w./m2), ordered by Carex scabrifolia community(171g.d.w./m2) > Artemisia fukudo community(172g.d.w./m2) > Suaeda japo- nica community(190g.d.w./m2) > Zoysia sinica community(673g.d.w./m2) and lowest in Salicornia harbaceae community(142g.d.w./m2).

금호호 주변 간척지의 습지환경 및 식생의 분포에 관한 지도 데이터베이스 구축 연구

임병선,이점숙,이기철,김종욱,임현빈,이승호 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.4

전남 해남군 화원면에 금호방조제 건설 후의 염습지의 습지 환경 및 식생의 분포에 관한 지도 데이터 베이스를 구축하기 위하여 토양의 유기물함량, 총 질소량, 나트륨함량 지도 및 습지의 잠재자연식생도(wetland potential natural vegetation map)를 작성하였다. 토양의 유기물함량과 나트륨함량은 담수가 유입되는 내륙쪽에 인접한 간척지역은 가장 낮은 값을 보였으며, 반대로 해안쪽이 간척지역이 가장 높은 값을 나타내었다. 토양의 sand함량과 총질소함량은 금호방조제 밖의 화원면 마산리에서 가장 낮았고, 내륙쪽에 인접한 간척지역은 가장 높은 값을 보였다. 금호호 주변 간척지의 잠재식생분포는 염분농도가 낮고 지하수위를 통하여 담수가 공급되는 육지쪽에는 갈대군락이, 해안선에는 호수주변으로 갈수록 차례로 나문재군락, 퉁퉁마디군락 및 칠면초군락이 분포할 것으로 추정되었다. To establish the map database on wetland soil environment and vegetation distribution after constructions of the Kumho seawalls in southwestern coastal wetlands in Korea, the maps of soil organic matter, total nitrogen and sodium content and wetland potential natural vegetation were made. Soil organic matter and sodium content were lower in reclaimed area near the land than near the sea. Soil sand and total nitrogen content were lower in the outside of the Kumho Seawalls than in reclaimed area near the land. In the distribution of wetland potential natural vegetation after constructions of the Kumho Seawalls, Phragmites communis community will be distributed in reclaimed area near the land, in which fresh water is streamed and then Suaeda asparagoides, Salicornia herbacea and Suaeda japonica community will be distributed from the land to the sea.

Evaluation of Iron and Zinc Content in Rice Germplasms

Jeom-Ho Lee,Kyu-Seong Lee,Hung-Goo Hwang,Chang-Ihn Yang,Sang-Bok Lee,Young-Hwan Choi,O-Young Jeong,Parminder Virk 한국육종학회 2008 한국육종학회지 Vol.40 No.2

The germplasm of 246 rice cultivars was analysed for iron and zinc contents using a Inductively Coupled Argon Plasma (ICP) at International Rice Research Institute (IRRI) Philippines. Iron contents ranged from 2.0 to 12.0, and zinc ranged from 10.0 to 33.0 (mg/kg), showing with the mean values of 4.3 and 22.8 (mg/kg), respectively. In genotypes tested, there was approximately a two-fold difference in iron and zinc concentrations, suggesting a genetic potential to increase these micronutrients in rice grain. A highly significant positive correlation (r2=0.503) was found between iron and zinc contents. Iron contents decreased drastically as polishing time increased, whereas zinc decreased only slightly. In the interaction between genotype and environment on iron contents, genotype (G), environment (E), and the G × E interactions accounted for 69%, 5% and 26% of the sums of squares, respectively. Indicating that genotype is would be the most significant factor for the to improve iron contents of rice in rice breeding, suggesting that therefore identifying genotypes with relatively stable performance across various environments is important as staple food crops.

Research for Trace Iron & Zinc Density in Rice

Jeom Ho Lee,Kyu Seong Lee,Parminder Virk,Hung Goo Hwang,Chang Ihn Yang,Sang Bok Lee,O Young Jeong,Young Tae Lee 한국육종학회 2007 한국육종학회 학술발표회 발표요지 Vol.38 No.1

GenotypexEnvironment Interaction of Micronutrients Density in Rice

Jeom Ho Lee,Kyu Seong Lee,Parminder Virk,Hung Goo Hwang,Chang Ihn Yang,Sang Bok Lee,O Young Jeong,Young Tae Lee 한국육종학회 2007 한국육종학회 학술발표회 발표요지 Vol.38 No.1

Comparisons of Nitrogen and Phosphorus Removal Capacity of Four Macrophytes

Lee, Jeom-Sook,Ihm, Byung-Sun,Kim, Jong-Wook,Lee, Seung-Ho The Ecological Society of Korea 2000 Journal of Ecology and Environment Vol.23 No.2

To evaluate the water purification capacity of 4 emergent macrophytes in 4 tributaries of Mankyung River, nitrate reductase activity (NRA) and nutrient removal capacity were determined. Higher NRA occurred in emergent macrophytes such as Persicaria thunbergii and Oenanthe iavanica with 7.8 and 5.4 ${\mu}$moi NO$_2$ g$^{-1}$d.wt. h$^{-1}$. respectively. The nitrogen removal capacity of emergent macrophytes displaying higher NRA fell within the range of 0.85 to 1.95 mg g$^{-1}$d.wt. day$^{-1}$ and was higher in the order Phragmites communis > Persicaria thunbergii > Oenanthe iavanica > Zizania latifolia. The phosphorus removal capacity was within the range of 0.07 to 0.12 mg g$^{-1}$d.wt. day$^{-1}$ and was higher in the order Phragmites communis > Oenanthe iavanica > Persicaria thunbergii > Zizania latifolia. In all the domestic, industrial and agricultural wastewaters, Phragmites communis showed the highest nitrogen and phosphorus removal capacity; 1.36 and 0.0088 mg g$^{-1}$d.wt. day$^{-1}$ respectively. Among the 4 macrophytes. Phragmites communis was the most suitable species for water purification in 4 tributaries of Mankyung River.