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박홍재,권택륜,김경환,김태산,박용환,김용환 한국육종학회 2004 한국육종학회지 Vol.36 No.2
This study was carried out to investigate the best explant source and combination of media and growth regulators for the regeneration of multiple shoots in soybean (Glycine max. L. Merr.) cv. Iksannamulkong. Multiple shoots could well be directly induced from both cotyledonary node and hypocotyl explants. However, more shoot were regenerated from cotyledons nodes than from hypocotyl explants. Among 5 different media tested, MSB medium, MS salts combined with B5 vitamins, was most effective for obtaining more regenerated shoots and higher ratio of explants (cotyledonary node) that give rise to regenerated shoots. All the three cytokinins, BA (2.0mg/l), Zeatin riboside (0.05mg/l) and thiazuron (TDZ, 2.0mg/l) were effective for obtaining enough number of regenerated shoot from cotyledonary nodes when added to MSB medium. The most effective cytokinin was zeatin riboside with an average number of 15.5 regenerated shoot per cotyledonary node and shoot regeneration was observed from 75% cotyledonary nodes plated. Therefore, for efficient shoot regeneration of soybean in vitro, it is recommended to plate cotyledonary node on MSB medium supplemented with 0.05mg/l zeatin riboside.
Hwang Seungmi(황승미),Kwon Taekryun(권택륜),Doh Eun-Soo(도은수),Park Mehea(박미희) (사)한국생물환경조절학회 2010 생물환경조절학회지 Vol.19 No.4
본 연구는 토마토의 토양 수분결핍조건에서의 생장과 생리적인 반응을 근본적으로 조사하기 위하여 수행되었다. 토양에 두가지 수분조건, 심한 수분결핍(-100㎪)과, 대조구인 약한 수분결핍 처리 (-25㎪)는 실시간 토양수분함량을 모니터링을 할 수 있는 토양센서와 관수 모듈을 갖춘 micro-irrigation 시스템을 고안, 온실에서 유지되었다. 토양수분함량은 30일동안 변동되었으며, -25㎪로 맞춰진 처리구는 평균 -47㎪, -100㎪ 처리구는 평균 -119㎪로 차이를 나타냈다. 이 두 가지 다른 토양수분상태에서 자란 식물체 사이의 생육을 비교해 본 결과 수분결핍상태(-100㎪)에서 자란 식물체가 대조구인 약한 수분결핍(-25㎪) 처리구에 비해 절간수의 차이없이 신장이 유의하게 감소하였으며 건물중의 축적은 더 높게 나타났다. 또한 건물중 당 엽면적의 차이 없이, 엽면적과 엽건중이 수분 결핍이 약한 처리구에 비해 수분결핍이 심한 처리구가 더 높게 나타났다. 이러한 생육상의 차이는 심한 수분스트레스가 엽두께의 변화없이 생체중의 증가와 엽면적 확보를 통해 토마토의 수분스트레스에 적응을 야기시킬 수 있음을 제시했다. 수분결핍에 따른 토마토 생육기간동안, 생리적변화를 조사한 결과, -100㎪ 처리구에서 자란 토마토가 대조구인 -25㎪ 처리구에 비해 엽의 상대수분함량의 증가와 잎의 삼투압이 낮게 나타났다. 이는 수분스트레스아래서 토마토의 더 나은 수분상태를 유지하기 위한 생리적인 적응을 설명해준다. 아울러 심한 수분스트레스는 대조구에 비해 PSII 활성과 수분활용도를 증가되었으며, 낮은 기공저항도를 나타내었다. 처리간의 광합성의 차이는 없었으며, 토마토 과실의 수와 생육량의 차이는 없었다. 이러한 결괴는 토마토 ‘Picco’가 엽형태의 변형과 삼투압, 수분활용도와 PSII의 활성을 통해 수분결핍상태에서 적응할 수 있게 만들 능력을 보여준다. 본 연구결과에서 나타난 토마토의 수분스트레스 적응 메커니즘은 토마토의 가뭄저항성 스크린에 있어서 고려되어져야 할 것으로 보인다. This study aim to investigate fundamentally the growth and physiological responses of tomato plants in responses to two different levels of water deficit, a weak drought stress (-25 ㎪) and a severe drought stress (-100 ㎪) in soil. The two levels of water deficit were maintained using a micro-irrigation system consisted of soil sensors for the real-time monitoring of soil water content and irrigation modules in a greenhouse experiment. Soil water contents were fluctuated throughout the 30 days treatment period but differed between the two treatments with the average -47 ㎪ in -25 ㎪ set treatment and the -119 ㎪ in -100 ㎪ set treatment. There were significant differences in plant height between the two different soil water statuses in plant height without differences of the number of nodes. The plants grown in the severe water-deficit treatment had greater accumulation of biomass than the plants in the weak water-deficit treatment. The severe water-deficit treatment (-119 ㎪) also induced greater leaf area and leaf dry weight of the plants than the weak water-deficit treatment did, even though there was no difference in leaf area per unit dry weight. These results of growth parameters tested in this study indicate that the severe drought could cause an adaptation of tomato plants to the drought stress with the enhancement of biomass and leaf expansion without changes of leaf thickness. Greater relative water content of leaves and lower osmotic potential of sap expressed from turgid leaves were recorded in the severe water deficit treatment than in the weak water deficit treatment. This finding also postulated physiological adaptation to be better water status under drought stress. The drought imposition affected significantly on photosynthesis, water use efficiency and stomatal conductance of tomato plants. The severe water-deficit treatment increased PSII activities and water use efficiency, but decreased stomatal conductance than the weak water-deficit treatment. However, there were no differences between the two treatments in total photosynthetic capacity. Finally, there were no differences in the number and biomass of fruits. These results suggested that tomato plants have an ability to make adaptation to water deficit conditions through changes in leaf morphology, osmotic potentials, and water use efficiency as well as psn activity. These adaptation responses should be considered in the screening of drought tolerance of tomato plants.
Data management for plant phenomics
김송림,Nita Solehati,최인찬,김경환,권택륜 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4
Plant phenomics is an area of biology dealing with the analysis of phenotypic traits in plants. It can be cointegrated with other omics like functional genomics, transcriptomics, and metabolomics etc. Phenotypic traits are generated by images of RGB, hyperspectral, near-infrared, thermal, fluorescence imaging and so on. Characterized phenotypes can be revealed in various morphological and physiological measurements of size, growth pattern, biomass and color in plants. The image-base automated plant phenotyping is described as a high throughput plant facility. Despite its advantages like nondestructive phenotyping it has its own limitations such as plant’s complex architectures and environmental conditions at the time of image capture especially in the field. Phenomics generates a large number of images and metadata through phenotyping instruments, so there is a need for proper data processing and managements. Standardized data storage and sharing is also necessary for meaningful data acquisition along with statistical analysis. Processes of data management are largely consisted of data collection, storage, documentation, along with improvement of data quality. In future, plant phenomics must be developed efficiently to store, analyze, protect and share the acquired data. Modern high throughput plant phenotyping could be used effectively in plant improvement programs.
Exploring Diversity among Rice Germplasms based on Their Physiological Traits Responses to Salinity
Inja Naga Bheema Lingeswar Reddy,이숙영,박용진,권택륜 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.2
Salinity is one of the major abiotic stresses that severely effects rice production throughout the world. Previously, there have not been many studies which focused on studying diversity among rice germplasm based on specific physiological traits for salt tolerance. Our diversity study was based on physiological traits such as Na+ concentration, K+ concentration, K+/Na+ ratio, osmotic potential, and biomass which are major components determining salt tolerance. This study has systematically analyzed phenotypic data of 191 germplasms in two different salt concentrations apart from the control. The current study identified salt tolerant germplasms based on their response to a single physiological trait as well as a combination of different physiological traits. Some of the germplasm identified outperformed known salt tolerant cultivar Pokkali. This study identifies correlation among various physiological traits. The salt tolerant germplasms can be taken forward into developingbetter varieties by conventional breeding and exploring genes for salt tolerance.