• Journal of Korean Society of Forest Science
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• v.79 no.1
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• pp.26-32
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• 1990

The relative aluminium tolerance of 5 Populus species (Populus davidiana, P. maximowiczii, P. nigra, P. alba ${\times}$ P. glandulosa, and P. nigra ${\times}$ P. maximowicizii) was evaluated on Murashige and Skoog medium with 5 levels of aluminium-EDTA concentration (0, 0.1, 0.2, 0.5, 1.0mM). The number of root initiation of 5 Populus species was significantly affected by the medium containing various levels of aluminium concentration. The native poplar, P. davidiana showed the highest aluminium tolerance among 5 species and even stimulated shoot and root growth on the medium containing at the low levels aluminium, 0.1 to 0.2 mM concentrations. The medium containing 1.0 mM aluminium inhibited root initiation from plantlets of all species except P. davidiana. Plantlets cultured on the medium with more than 0.5 mM aluminium exhibited retarded growth and abnormal leaf shape. P. nigra ${\times}$ P. maximowiczii exhibited significantly higher aluminium tolerance than its parental species. Silvicultural aspects associated with aluminium tolerance of Populus are also discussed.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2021.04a
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• pp.30-30
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• 2021

빌레나무는 국내에서 제주도 서부 곶자왈 지역에서만 자생하는, 어두운 환경을 선호하며 개체수가 희소한 종이다. 본 연구는 광 환경이 빌레나무 묘목 생장에 미치는 영향을 파악하고자 수행되었다. 서귀포시 난대아열대산림연구소 내 양묘장에 차광막을 이용하여 35%, 55%, 75% 차광 처리구를 설치하였고 노지에 비차광 처리구를 비교구로 설정하였다. 2019년 7월에 삽목 증식시킨 빌레나무를 2020년 5월에 각 처리구에 이식하였다. 2021년 3월에 각 차광 처리구의 모든 묘목의 묘고, 잎의 수, 줄기 수를 측정하고 생육이 건전하고 평균적인 묘목을 각 9본씩 굴취하여 건중량을 측정하였다. 35%, 55%, 75% 차광 처리구별 평균 묘고(cm)는 각각 53.2, 51.3, 41.4, 평균 잎의 수(개)는 41.3, 42.1, 24.4, 평균 줄기 수(개)는 3.1, 2.7, 2.2로 나타났다. 평균 묘고, 잎의 수, 줄기 수는 35% 차광 처리구와 55% 차광 처리구에서 75% 차광 처리구보다 높은 경향을 보였다. 건중량 분석 결과, 35%, 55%, 75% 차광 처리구별로 평균 잎 건중량(g)은 각각 11.3, 9.5, 5.5, 평균 줄기 건중량(g)은 5.6, 5.3, 2.6, 평균 뿌리 건중량(g)은 4.5, 3.6, 2.6으로 차광률이 낮을수록 증가하였으며 모든 부위별 건중량은 처리에 따른 통계적 유의성을 보였다(p<0.05). 지상부 대비 지하부 비율은 75% 차광 처리구에서 0.35로 가장 높았으며 35%, 55% 차광 처리구에서 0.27, 0.26로 나타났다. 한편, 비차광처리구의 모든 묘목들은 2021년 1~2월경 지상부가 고사하였다. 본 연구결과, 빌레나무 묘목은 노지에서 생존률이 불량하고, 차광 처리 시 차광률 증가에 따라 생장에 부정적인 영향을 받는 것으로 판단된다. 빌레나무의 건전한 생육 및 유무성증식을 통한 보급 증대에 기여하기 위하여 향후 온도, 수분 등 여러 환경 인자를 조절하는 연구가 필요한 것으로 사료된다.

• Journal of Bio-Environment Control
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• v.30 no.3
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• pp.237-243
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• 2021

The objective of this study was to evaluate the effect of stem number on plant growth, fruit quality, and yield of sweet peppers grown in greenhouses under supplemental lighting in winter. The seedlings were transplanted at 3.2 plants·m^-2 on October 26, 2020, and started supplemental lighting with 32 high pressure sodium lamps for 16-hour photoperiod from December 1, 2020 to May 25, 2021. Stems were differently trained with 2 and 3 numbers after branching nodes were developed. In the final harvest, the plant height was significantly shorter in the 3 stem-plants than in the 2 stem-plants. The number of nodes per stem and the leaves per plant were increased in the 3 stem-plants than in the 2 stem-plants, while the leaf area was less affected. There were no significant differences in the dry mass of leaves, stems, and immature fruits between the 2 and 3 stem-plants. The fruit fresh weight and fruit dry weight in the 3 stem-plants were decreased by 17% and 12% at 156 days after transplanting (DAT), and by 17% and 15% at 198 DAT compared to those in the 2 stem-plants, respectively. The marketable fruit rates were 93.6% and 95.4% in the 2 and 3 stem-plants, respectively. The total fruit yield in the 3 stem-plants was increased by 30.2% as compared to that in the 2 stem-plants. We concluded that the 3-stem-training cultivation positively affected the total fruit yield by sustaining adaptive vegetative growth of the plants. This result will help producers make useful decisions for increasing productivity of sweet peppers in greenhouses.

• Journal of agriculture & life science
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• v.50 no.2
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• pp.73-82
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• 2016

Best drought tolerance index was determined through statistics analysis and growth appearance of drought tolerant plants was determined by cultivation in pot and sloping land. For determination of best drought tolerant indicators, RD(Resistant dry days), LD(Leaf area), UTR(Unit transpiration), RWC(Relative water content), RWL(Relative water loss), LA(Leaf area), SN(Stoma unmber) and SA(Stoma area) were carried out by correlation and PCA analysis. RWL and UTR were affected on plant drought tolerance according to comparison among six indices for resistant dry days. The PCs axes separated SA, LA, RD and RWC and SN. UTR was negatively correlated with SA, RWL were also negatively correlated with RWC and SN. RWL and UTR were proved best selection indicator for the selection of drought tolerant species. Ulmus parvifolia, Bidens bipinnata, Patrinia villosa, Kummerowia striata, Arundinella hirta, Artemisia gmelini etc. were selected drought tolerant plants. Shoot growth appearance of drought resistant plants was differed pot and sloping land. Shoot growth and leaf number was no significant differences between the pot and sloping land. However, root growth of drought tolerant plants was all the difference between two cultivation. T/R ratio of drought tolerant plants was also found a big difference. T/R ratio of drought tolerant plants in sloping land was lower than that of pot. These results will be served efficiently plant breeding.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.s01
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• pp.4-15
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• 1989

The objective of this paper is to compare and summarize the procedure and effectiveness of some bioassay systems and to point out ways to obtain reliable results from each bioassay. Detailed C:escriptions were given for those widely-adapted bioassay methods, such as mungbean rooting (auxin), Avena first internode straight growth (auxin), dwarf rice growth (gibberellin), dwarf pea epicotyl elongation (gibberellin), radish cotyledon expansion test (cytokinin), and tobacco stem pith callus growth (cytokinin), and the effects of various plant growth regulators including some recently introduced growth retardants (Paclobutrazol, Uniconazol, etc.) were also summarized.

• Journal of Korean Society of Forest Science
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• v.103 no.4
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• pp.547-555
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• 2014

This study was carried out in order to investigate the germination and the early growth characteristics of Parasenecio firmus. Seed pre-treatment before the each experiment was carried out by shading treatment (with drying at room temperature (DRT), drying at low temperature (DLT) and water soaking (WS) for 48 hours). Experiment was performed by shading treatment (full sunlight, 35%, 50%, 75%, and 95% shading). Seeds of Parasenecio firmus were surveyed the highest germination rate (61.1%) in full sunlight with WS (overall 25.7~61.1%). Height was surveyed the highest under 95% shading. And root collar diameter was surveyed the highest in full sunlight. Fresh weights (leaf, shoot, root and total) were the highest under 50% shading. Dry weights (leaf, shoot and total) were the highest under 75% shading. It was indicated the lowest leaf, shoot, root and total under 95% shading. Leaf growth (leaf area, leaf length, leaf width and leaf thickness) and root growth (total root length, root project area, root surface area, root diameter and root volume) were good under 35%~75% shading, but the lowest under 95% shading. As a result of surveying the whole experiment, seed of Parasenecio firmus grows well under 50%~75% shading after germination by high sunlight with water soaking (WS).

• Korean Journal of Plant Resources
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• v.21 no.1
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• pp.47-51
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• 2008

This study was carried out to get the basic data for safflower cultivation according to sowing date by growth analysis for 2 years form 2003 to 2004 at Institute of natural product in Uiseong, G.B.A.R.E.S.. Safflower(Cheongsoo cultivar) was seeded at March 1st, April 1st, May 1st, and July 1st in field. The necessary date for germination was 24 days, when safflower was seeded at March 1st, but it was 8 days which sowed at April 1st and when the seed was sowed at high temperature period, the necessary date for germination was getting short. The necessary date for flowering was the same trend as germination; it took 104 days at March 1st, 79 days at April 1st, 65 days at May 1st, and 58 days at July 1st sowing treatment. The safflower growth was the most vigor when it was sowed at March 1st. T/R(Top/Root) ratio was gently increased during growing season, but when the seed was sowed at July 1 st, it was low compare to sowing at March 1st and April 1st. RGR(Relative growth rate) was the highest during shoot growth stage, but it was rapidly decreased after flowering. CGR(Crop growth rate) was increased at branching stage, and the increasing velocity was slightly decreased just before flowering, and it was increased again at flowering and at this stage, CGR was the highest, and then it did not increased. NAR(Net assimilation rate) was the highest at shoot growth stage during growing season, and was the highest which was sowed at March 1st.

• Journal of Korean Society of Forest Science
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• v.89 no.4
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• pp.522-526
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• 2000

We tried to mass-propagate Prunus yedoensis from Jeju through tissue culture. We investigated the effect of bud collection time, the concentration of $NH_4NO_3$ in media and plant growth regulators(BAP, $GA_3$ and IBA) on the differentiation of winter buds. Buds, taken in February, flushed well regardless of various in vitro conditions. Bud flushing rate was significantly different depending on the collection time. BAP appeared to be effective on bud flushing. Sixty percent of buds taken in October flushed on the media containing $3.0mg/{\ell}$ BAR. No buds flushed on the medium supplemented with IBA. Buds, after flushing in BAP media, grew as foliated shoots and showed a rosette of leaves. When $GA_3$ supplemented to the BAP-containing media as a higher concentration than that of BAP, shoots elongated and developed into normal shoots. The combination of BAP $1.0mg/{\ell}$ and $GA_3$ $2.0mg/{\ell}$ is most recommendable for shoot elongation.

• Korean Journal of Plant Tissue Culture
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• v.22 no.5
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• pp.283-290
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• 1995

This experiment was canted out to obtain embryogenic callus and to understand developmental mechanism of somatic embryogenesis in Oenanthe javanica ($B_{L.}$) DC. experiments included the examination of explant source and media for embryogenic callus production and the observation of developmental pattern of embryogenic cells and non-embryogenic cells. Embryogenic calli were formed on zygotic pro-embryos together with their endosperms when they were cultured on Ms media containing 1.0mg/L 2,4-D. Embryogenic calli were also formed on the intact surface in vitro grown stem or petiole segmentsafrer 6-8 weeks of culture, whereas non-embryogenic calli were formed on cut surfaces of the stem and petiole after 2 weeks of culture. Non-embryogenic calli were rhizogenic in suspension and solid media culture.

• Journal of Wetlands Research
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• v.1 no.1
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• pp.61-69
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• 1999

The above ground biomass and annual net productivity of Salix nipponica were estimated by the allometric method in the littoral zone of Parksil-nup wetland, Hapcheon-gun, Gyeongsangnam-do Korea. The density of stems and individuals per hectare were 14,950 and 6,140, respectively and the mean number of stems per individual was 2.43. The proportion of the above ground biomass of stem, branch, and leaf were 59.2%, 28.3% and 12.5%, respectively. The standing crops was 109.7 ton/ha and total phytomass was 926.7 ton in the study area. Annual net production was 25.3 ton/ha estimated from the standing crops and the age structure.