• Journal of Bio-Environment Control
• /
• v.16 no.2
• /
• pp.115-120
• /
• 2007

An experiment was conducted to measure rooting and growth of cuttings of rose as affected by cutting length, number of leaflets and cutting position. Test plants were two cultivars of Rosa hybrida 'Red Sandra'(standard) and 'Little Marble'(miniature). Cutting length was 4, 7 or 10cm for 'Red Sandra' and 3, 5 or 7 cm for 'Little Marble'. The number of leaflets left on the five-leaflet leaf was 0, 2, 4 or 5. The cutting position on the stem was between $1{\sim}2,\;3{\sim}4,\;5{\sim}6\;or\;7{\sim}8$ nodes from the shoot tip, which have five leaflet leaves. The most efficient cutting length was 7cm in both cultivars. Treatment with all leaflets left and cutting position at $1{\sim}2$ nodes resulted in good rooting ratio for both cultivars.

• Journal of Plant Biotechnology
• /
• v.35 no.3
• /
• pp.229-234
• /
• 2008

An efficient micropropagation was established by using axillary bud explants from two-year-old tree(Echinosphorea koreensis Nakai), which has been known as a rare and endangered species. Among various basal media tested, DKW medium was shown to be the best for axillary shoot elongation. The addition of both BA and TDZ to the medium induced 6 to 10 shoots per explant during eight weeks of culture, without showing any abnormal morphology at the shoot proliferation stage. However, high concentration of TDZ(>0.05 mg/L) appeared to cause hyperhydration on either leaf or shoot at the later developmental stage. Approximately 20% of shoots produced roots by the addition of 1.0 mg/L NAA but not by IBA($0.2{\sim}1.0$ mg/L). Ex vitro micro-cuttings were better source for root induction; up to 58.6% of the micro-cuttings rooted when 100 mg/L IBA was applied to the soil(vermiculite). More than 90% of plantlets with roots were successfully acclimatized and grew normally in the field. Therefore, we suggest that this endangered tree species can be effectively micropropagated by axillary bud culture system developed in this study.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.29 no.3
• /
• pp.298-305
• /
• 1984

The competitive relationship between orchardgrass (Dactylis glomerata L.) and ladino clover (Trifolium repens L.) was studied under aerial and soil partitions and N, P fertilizer combinations. Orchardgrass and ladino clover were grown in field with one of non competition, shoot competition only, root competition only, full competition and competition between same species. Under basal application of K fertilizer N and P were applied in treatment combinations of blank, N only (l5kg/10a), P only (l5kg/10a), and both NP at planting and each cutting. The forage yield in mixture was between yield of pure orchard grass stand and the 'expected yield', which was a mean of both pure stands. The forage yield in pure ladino was the lowest. During the experiment there was a progressive decline in clover yield either pure stand or mixture. Since orchardgrass was 'over-compensated' to low-yielding clover, the yield of mixture was more than non competition. Orchard grass was more competitive than ladino clover as seasons advanced. The aggressivity of orchardgrass was higher in root competition than in shoot competition comparing to clover. Nitrogen fertilizer increased orchardgrass yield, while phosphate did ladino clover yield and root weight of both species. But the additional effect of P to N was not significant in dry weight and LAI.

• Weed & Turfgrass Science
• /
• v.7 no.2
• /
• pp.140-147
• /
• 2018

In Korea, mowing the grass of a grave (Beolcho) is a very important event preceded by Chuseok (Korean thanks giving day) and Si-Hyang (annual ancestral feast). Because Beolcho usually takes place one or two weeks before Chuseok, the traffic accidents on roads are getting worse and safety accidents are getting more and more. Erroneous Beolcho methods can cause the soil to be exposed and cause the loss of soil or the low shoot density of graveyard grass or weed occurrence. Therefore, the dispersion of the Beolcho timing and the approprite method can be import issues. The present study assessed the effects of grass mowing timing and height before Chuseok on the growth of Zoysia japonica and Z. matrella. The mowing timing was evaluated at 1 week, 2 weeks, 3 weeks, and 4 weeks before Chuseok, and the mowing height differently according to the two type of grass. In Z. japonica, the faster mowing before Chuseok, the longer the plant height, and the coverage rate and shoot density were higher. In Z. matrella, the faster mowing, the longer the shoot length, but the coverage rate and shoot density did not show any difference or tendency. As compared to Z. japonica, the plant height of Z. matrella was kept short regardless of the time of mowing. In both grasses, the plant height was shortened when mowing was done at low cutting height, but the coverage rate and shoot density were decreased. In addition, it was shown that it is advantageous to maintain the shoot density of graveyard lawn by 40-50 mm or 30-40 mm cutting above the ground for Z. japonica or Z. matrella, respectively.

• Korean Journal of Weed Science
• /
• v.9 no.1
• /
• pp.34-38
• /
• 1989

This study was conducted to investigate the tuberization time and the control method for Eleocharis kuroguwai Ohwi. The control methods were compared the shoot cutting and bentazon treatment for E. kuroguwai with untreatment. The initial tuberization time of E. kuroguwai, when E. kuroguwai was planted and without rice planted, was about August 18th and 10th, respectively. When the shoot of E. kuroguwai was cut, the regrowth vigour scarcely revived for the cutting on September 12. The least tuberization of E. kuroguwai, when E. kuroguwai was just planted and planted with rice plant, were on August 28 and August 3 to the top cutting of E. kuroguwai, respectively. Bentazon treatments from July 19 to August 3 hardly induced tuberization of E. kuroguwai, while as the delay of bentazon treatment time the tuberization of E. kurguwai was little by little increased.

• Journal of Korean Society of Forest Science
• /
• v.104 no.1
• /
• pp.76-83
• /
• 2015

Old growth and protected-trees are worth history and culturally in Korea. This research carried out to investigate habitat characterization and the vegetative propagation methods of Salix chaenomeloides(100-600 years old trees) in Gyeongsangnamdo Province. It has been preserved in good and grow naturally in area surrounding village(4 trees), riverside(1 tree) and field(1 tree). Cutting from old growth and protected trees was conducted using 10 kinds of bedsoils. It was survived above 93% in all bedsoils. Growth of cuttings is a distinct difference according to bedsoils and tree ages. Growth of cutting was high on CBS, followed mixed bedsoils(VPMP) including vermiculite, peatmoss and perlite. Root collar diameter was difference depend on tree ages and bedsoils. All trees are produced 1 to 4 branch. Root growth of cutting was 20 cm on CBS and VPMP, which is the best shoot growing on cutting. Bedsoil with physico-chemical characteristics of high moisturizing ability, high air permeability, high EC value and slightly acid may be suitable for efficiently cutting propagation of old growth and protected S. chaenomeloides. CBS and VPMP bedsoil are favorable for propagating this species by cuttings.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.50 no.5
• /
• pp.301-308
• /
• 2005

This study was carried out to investigate the effect of stem-cutting (SC) length and portion on the major agronomic characters related with dry matter production and accumulation, and to examine their relation­ships in cassava. When cassava was planted with longer SCs or with older portion SCs, major canopy or source characters like leaf number and leaf area index developed excessively, while tuber yields could be reduced due to the decrease of root/shoot ratio, relative growth rate, root dry weight, and harvest index, particularly in the bitter varieties (high cyanide-level varieties). It was considered that the sweet varieties (low cyanide-level varieties) be early­bulked with higher tuber yield when they are planted with the 25-30 cm long SCs or with the SCs from young type to semi-mature portions of mother stems, while the bitter varieties with the 15-20 cm long SCs or with the SCs from semi-mature to hardwood portions of mother stems, respectively. However, a significant interaction between length and portion of SC was not observed in all agronomic characters.

• Journal of Plant Biotechnology
• /
• v.41 no.2
• /
• pp.100-106
• /
• 2014

In order to develop an efficient in vitro micropropagation technique for a rare plant species, Astragalus membranaceus Bunge var. alpinus N., shoot proliferation and in vitro or in vivo rootings were conducted and hyperhydrated leaf generated from cultures was histologically observed. During shoot induction, no distinct effect on multiple shoot induction was found between BA and kinetin treatment. BA enhanced the number of internodes, whereas kinetin stimulated shoot elongation. Hyperhydrated leaf composed of bigger cells and retarded palisade parenchyma and showed irregular cell arrangement compared to normal leaf. Especially starch content in hyperhydrated leaf was significantly reduced. The best rooting rate was achieved by B5 medium among three different medium (B5, MS and WPM) and 0.1mg/L IBA treatment induced the highest rooting ratio (80%). No statistical difference was induced by explant types (apical bud or axillary bud) in terms of rooting ratio. In vivo cutting induced rooting rate up to 65% by 0.5% IBA/Talc powder treatment. Although in vivo rooting rate was less efficient compared to in vitro rooting, better survival rate was observed after soil acclimatization. Present study suggested that above micropropagation techniques can be used for rapid multiplication as well as in vitro or in vivo conservation of the species.

• Korean Journal of Environment and Ecology
• /
• v.29 no.6
• /
• pp.842-849
• /
• 2015

This study investigated the effects of rare-earth fertilizer on the shoot cuttings' rooting of Vitex rotundifolia L. and Tamarix chinensis Lour. The shoot cutting test was carried in 2008 and the main results are summarized as follows. The rate of rooting and the average roots increased in both number and length when rare-earth fertilizer is treated in V. rotundifolia and T. chinensis in comparison to those of the untreated control plot. In particular, when rare-earth fertilizer is diluted with water 1/2500, the rooting outstandingly increases. This result is almost similar to the effect of the rooting stimulant, IAA. Although there is no differentiation in its rooting rate according to the density, the rooting of T. chinensis shows a 100 percent effect on in the entire treated plot but not in the untreated control plot, so it is usable as a rooting stimulant. As for shoot cuttings' rooting, depending on the time immersed in diluted solution of rare-earth fertilizer, both V. rotundifolia and T. chinensis showed relatively higher percentages in all treatment plot immersed for 60 minutes than for 10 minutes. In conclusion, considering the results of the rooting percentage and the average number and length of roots of V. rotundifolia and T. chinensis, the shoot cuttings' rooting appeared higher in percentage when they were immersed in the rooting stimulant for sixty minutes with a lower density than 1/2500. This result shows that rare-earth fertilizer can be utilized as an alterative for IAA rooting stimulants currently available in the market.

• Korean Journal of Medicinal Crop Science
• /
• v.10 no.5
• /
• pp.353-365
• /
• 2002

This study was conducted to investigate the effect of cultural methods(cutting, flower removal) on growth and quality of B. falcatum L. Jeongseon local cultivar collected in Korea and Mishima local cultivar introduced from Japan were used. Some of the results obtained are as follows; Jeongseon local cultivar showed less stem branches and shoot weight compared to Mishima. However, Jeongseon local cultivar showed tall plant height, high root fresh and dry weight, and high levels of saikosaponin-a and total-saikosaponin, but low saikosaponin-c content than that of Mishima. Both cultivars seeded on March 20 had longer main root, bigger stem diameter, few stem branch, and high saikosaponin-c content compared with those of late seeded one, April 30. Growth characteristics such as plant height, stem diameter, stem branch number, shoot weight, root diameter, root fresh and dry weight, and root branch number were increased in a low planting $density(30{\times}15\;cm)$, but the content of saikosaponin was not affected by planting density. Jeongseon and Mishima cultivars seeded on April 10 with $30{\times}15\;cm$ planting density and April 30 with $30{\times}10\;cm$ planting density contained highest total saikosaponin levels, respectively. However, average root dry weight was not affected by planting time or density in both Bupleurum cultivars. Both cutting and flower removal increased the length of main root, fresh and root weight, and saikosaponin-a, saikosaponin-d and total-saikosaponin in Jeongseon cultivar than that of Mishima. As the harvesting time was delayed, plant height, stem diameter, shoot weight, length of main root, root fresh and dry weight were increased, but content of saikosaponin-a, saikosaponin-d and total-saikosaponin were decreased.