• Proceedings of the Korean Society of Crop Science Conference
• /
• 2022.10a
• /
• pp.276-276
• /
• 2022

Wheat is one of the most widely grown food crops worldwide. Extreme precipitation and wind disturbances increased due to the abnormal climate, which resulted in increased lodging. Introduction of dwarf genes in wheat significantly increased lodging resistance and productivity in wheat breeding. In this study, we performed the genotyping of dwarfing genes between 'Keumkang' and 'Komac 5' ('Keumkang' mutant). In addition, we investigated the relationship between plant height and several phenotypic characters using F₂ segregation populations derived from crosses between the two varieties. There was no significant difference in phenotypic characters between the two varieties except for plant height. In the genotyping analysis using dwarfing genes, mutations of two dwarfing gene were found to be induced between the two varieties. The four genotypes of the F₂ populations from a crossing between 'Keumkang' and 'Komac 5' were used to compare and evaluate the effects of two dwarfing genes. Plants with two single mutant dwarfing gene and double mutant dwarfing gene revealed reduced plant heights than control plants by 4.5%, 6.9%, and 33.2%, respectively. The phenotype analysis showed that double mutant dwarfing gene affected wheat stem growth as the length decreases from the second node, resulting in decreased plant height. However, there were no significant differences in the agronomic traits between mutant plants and control plant. These results may provide novel information about the effect of double mutant dwarfing gene on plant height, and may help improve lodging tolerance and wheat yield.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.7 no.2
• /
• pp.1-11
• /
• 2004

The purpose of this study was to determine usability as potted flowers and garden plants by controlled plant height using growth retardants. There was no significant difference on the dwarfing effect according to the degree of exposure the sun, but growth was well under full exposure to the sun. The plant height was decreased by application of Cycocel (CCC), Bonzi (paclobutrzol), Ancymidol, and Uniconazole compared to the control group, and treatment of Bonzi $5mg{\cdot}L^{-1}$ was most dwarfing effect for both full sun exposure or 70% controlled shading condition. No consistent different was found in stem diameter, leaf color change, the content of chlorophyll and anthocyanin when the concentration of plant growth retardants was altered. These factors were affected only by light intensity. In comparison to the results of the control group, leaf length, leaf width, plant width and petiole length were all reduced by the application of growth retardants.

• Journal of Bio-Environment Control
• /
• v.12 no.3
• /
• pp.139-146
• /
• 2003

This study was conducted to investigate the effects on the over-growth inhibition of fruit vegetables (tomato, cucumber, and hot pepper) seedling by the treatment of triazole-typechemicals and to select the most effective chemicals for the over-growth inhibition, and to investigate suitabla concentration treatment and times of the newly selected chemical. The triazole-type chemicals inhibited stem height more, the more the concentration is increased in any crops. The diniconazole showed the highest dwarfing ration, and the tebuconazole and hexaconazole are also good for dwarfing ratio. The diniconazole decreased the plant height of cucumber, tomato, and hot pepper as the concentration is increased. In cucumber, thc dwarfing ratio was 30% in the 5 mg${\cdot}L^{-1}$ treatment, and was 60% in thc l00 mg${\cdot}L^{-1}$ treatment. In tomato and hot pepper, the dwarfing ratio was 30% in the 25 mg${\cdot}L^{-1}$ treatment in any times. In diniconazole treatment, the cucumber and tomato should have 5 mg${\cdot}L^{-1}$ at the lst growth stage and the hot pepper should have 5 mg${\cdot}L^{-1}$ at the 2nd growth stage to obtain good seedlings.

• Horticultural Science & Technology
• /
• v.19 no.4
• /
• pp.564-567
• /
• 2001

This experiment investigated the dwarfing effect of daminozide and chlormequat to produce high quality of spray chrysanthemum. Long neck of cut-chrysanthemum break easily. Peduncle length of the cultivar 'Biarittz' and 'Vyking' were retarded by the foliar spray treatment of $1500mg{\cdot}L^{-1}$ daminozide. Daminozide application did not affect plant growth of 'Biarittz' and 'Vyking'. However, the number of days to flowering was delayed by 3 days by daminozide application of 'Biarittz'. Length of cut flowers of 'Vyking' was decreased by the application of daminozide, while chlormequat did not affect dwarfing of peduncle length in spray chrysanthemum.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.21 no.2
• /
• pp.222-232
• /
• 1976

Two different cultivars of barley, with either the ordinary-level or double-strength nitrogen application, were grown in two districts simultaneously, in order to study the extent of dwarfing in plant height, lodging and grain-yield increase with ethylene-releasing agents (Ethrel and dl-methionine alone or in combination). The shorter the plant height, the less the extent of lodging and the grain yield there were. With 500ppm Ethrel, 10% grain-yield increase was attained without showing apparent lodging, irrespective of the level of nitrogen applied. The double-strength nitrogen application resulted in severe lodging more than the ordinary-level and control, and lower grain yield accordingly. Consideration for importance of barley lodging in Korea today and the controlling measure with ethylene treatment for dwarfing, and yield increase by increased nitrogen application, were discussed.

• Journal of Bio-Environment Control
• /
• v.21 no.4
• /
• pp.343-347
• /
• 2012

The purpose of this study was to examine the dwarfing effect in variable temperature treatments on 1-year-old and 3-year-old Chloranthus glaber. The plants grown in four difference growth chamber under a mean light intensity $500{\pm}20$ lux, RH of $40{\pm}5%$, and temperature of $5^{\circ}C$, $10^{\circ}C$, $15^{\circ}C$, and $20^{\circ}C$ for 120 days from January 3, 2011. And then they were moved into a glass house (50% shading). In 1-year-old seedlings, the rate of plant height elongation was lowest at $5^{\circ}C$, but plant growth was not good. The number of leaves and leaf width were highly increased by $10^{\circ}C$ treatment although the plant height was slightly increased. Also the plant height of $15^{\circ}C$ and $20^{\circ}C$ was decreased and defoliation was started from the bottom leaves. Thus, $10^{\circ}C$ treatment was thought to be the most appropriate for dwarfing effect of 1-year-old seedlings. In 3-year-old seedlings, the plant height tended to increase with temperature, and growth pattern showed a similar trend between $5^{\circ}C$ and $10^{\circ}C$, $15^{\circ}C$ and $20^{\circ}C$. The number of leaves increased the most at $5^{\circ}C$. Lateral branches per node were mainly occurred at $5^{\circ}C$ and $10^{\circ}C$, whereas they almost didn't happen at $15^{\circ}C$ and $20^{\circ}C$. Flowering rate at $5^{\circ}C$ and $10^{\circ}C$ reached more than 90% and 60%, respectively, but it was too low at $15^{\circ}C$ and $20^{\circ}C$ until the end of August. From these results, it could improve plant quality of 1-year-old and 3-year-old Chloranthus glaber making compact potted plants when temperatures were maintained at $10^{\circ}C$ and $5^{\circ}C$, respectively.

• Journal of Life Science
• /
• v.5 no.4
• /
• pp.190-202
• /
• 1995

Two oriental melons cultivars, ‘Geumssaragi Euncheon’(GSEC) and ‘House Eunchon’(HEC), were grafted onto different rootstocks and the growth, mineral contents and fruit quality were examined. The seedlings grafted onto‘Geumtozwa’rootsticks showed about 10% defected seedling loss(wilting or dwarfing0as compared to the little or no loss in the seedlings grafted onto 'Sintozwa' or 'Chamtozwa' rootstocks. The seedings grafted onto 'Sintozwa' or 'Chamtozwa' rootstocks also exhibited better vine growth as compared to the intact seedlings or the seedlings grafted onto 'Geumtozwa' rootstocks. The fruits growth, as measured by fruits length, fruit diameter and fruit fresh weight, was accelerated by the rootstocks especially by 'Sintozwa' and 'Chamtozwa' . Intact oriental melons showed the highest soluble solids content in the fruit pericarp followed by 'Chamtozwa' rootstocks. Sucrose contents were higher in the seedling grafted onto 'Sintozwa', whereas higher glucose and fructose contents were measured in intact GSEC fruits or HEC fruits on 'Chamtozwa' rootstock. As compared to the intact plants, the seedling grafted onto 'Sintozwa' rootstock showed higher N. P and K and lower Ca and Mg contents in leaves, stems, roots and fruits. 'Geumtozwa' rootstock, developed specially for oriental melons, showed very similar pattern of mineral absorption or distribution as compared to the intact plants.

• Horticultural Science & Technology
• /
• v.19 no.4
• /
• pp.568-573
• /
• 2001

The effects of foliar spray and soil drench application of triazole chemicals (diniconazole, myclobutanil, difenoconazole, tebuconazole, bitertanol, hexaconazole) on growth and flowering control in zinnia were investigated. For foliar spray application of tebuconazole, diniconazole and bitertanol on 'Dream Land Rose', plant height was decreased but tebuconazole gave the best result for dwarfing. Diameter, fresh and dry weights of flower were markably decreased at high concentration of tebuconazole. However, days to flowering was not affected by chemicals tested. For 'Dream Land Scarlet', plant height was decreased with all chemical treatments. Tebuconazole severely decreased plant height, in particulas. Diniconazole hastened flowering. For soil drench of 'Dream Land Rose', plant height was decreased by diniconazole and mycrobutanil, but diniconazole was more effective for plant height decrease. Flowering was hastened by diniconazole in both 'Dream Land Rose' and 'Dream Land Scarlet'. Plant height of 'Dream Land Scarlet' was decreased by all chemicals tested. Flowering was not occurred at $300mg{\cdot}L^{-1}$ myclobutanil with severe suppression of stem growth.

• Horticultural Science & Technology
• /
• v.19 no.4
• /
• pp.574-578
• /
• 2001

The effects of seed soaking (8 and 24 hours) and foliar spray of plant growth retardants (daminozide, chlormequat and uniconazole) on growth control in zinnia were investigated. For seed soaking of 'Dream Land Rose', the changes in plant height was not affected by seed soaking time (8 and 24 hours), while it was severely suppressed by high concentration of chemicals tested. An application of $125mg{\cdot}L^{-1}$ uniconazole was most effective for plant height suppression. Flowering was promoted by all treatments of chemicals. However, for 'Dream Land Scarlet', plant height control at 24 hours seed soaking showed more effective than 8 hours, and all treatments of chemicals decreased plant height. Uniconazole gave the best result for plant height control. Flowering tended to be hastened by the treatment of chemicals. For foliar spray, plant height was remarkably decreased at high concentration of uniconazole. Flowering was promoted by chlormequat and uniconazole in both 'Dream Land Rose' and 'Dream Land Scarlet'. Also, daminozide decreased number of petals.

• Horticultural Science & Technology
• /
• v.17 no.2
• /
• pp.131-133
• /
• 1999

The plant height and internodal length of Mentha piperita, Origanum vulgare L., and Thymus vulgaris L. were reduced according to the treatment of 500, 2,500, 5,000 mg/L B-9 and 0.5, 1.0, 5.0 mg/L uniconazole. On the efficiency of dwarfing in 3 herb species, uniconazole was more effective than B-9, but plant height of Thymus vulgaris was more shortened with 2,500mg/L B-9 treatment than 3 levels of uniconazole treatments. Cuttings from 3 kinds of herbs tested were died with 5,000mg/L B-9 treatment. The number of lateral shoots per plant was heighest at control plants and uniconazole was more effective in reducing lateral shoots than B-9. There was no significant difference in leaf growth between B-9. There was no significant difference in leaf growth between B-9 and uniconazole treatments. The root growth of Mentha poperita, Origanum vulare, and Thymus vulagris was not significantly affected by B-9 or uniconazole.