• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.34 no.1
• /
• pp.1-6
• /
• 1989

Three growth regulators, TIBA (2. 3. 5-Triiodobenzoic acid). ABA(Abscisic acid) and DGLP were sprayed on soybean plants sown on April 25 and May 10 to investigate those effect on growth and yield of Hwangkeumkong cultivar. TIBA or ABA reduced stem length. and lodging. however. increased stem diamater podding rate. number of pods and seeds per plant, and seed yield. Among 3 growth regulators TIBA was most effective to healthy growth and to increase of seed yield. Optimum treatment method for healthy plant growth and higher grain yield was 2-3 times spray with 5-day interval from 6 leaf stage (V6) of soybean plants. Soybean seed yield in the plot of TIBA treatment with 3 times from 6 leaf stage was 20% higher both in early and ordinary seeding field than those of non-treatment plots.

• Current Research on Agriculture and Life Sciences
• /
• v.11
• /
• pp.43-54
• /
• 1993

This experiment was conducted at Andong county cropping season to investigate rice response and consequent changes in the physiological activities and agronomic characters of rice as affected by growth regulator treatments, and to determine how low temperature controls some plant growth mechanisms. Plant growth regulators, particularly ABA, applied to 15 DAT regardless of concentration, gave higher tar plant height and tiller number after 10days of low temperature treatment than did the untreated plant. However, the differences in plant height and tiller number among treatments diminished to plant growth. Chlorophyll content seemed to be enhanced by growth regulators under low temperature condition. The 10-day treatment of low temperature decreased chlorophyll content by more than 17% compared with the untreated control. The oxidizing activity of roots decreased sharply to 52.2a after 10 days in low temperature condition. On the other hand, ABA at concentration of $10^{-4}M$, highly attains oxiding activity of roots. Generally, plant growth regulators applied at 15 DAT under low temperature reduced grain yield more than did the untreated control which can be attributed to decreased yield components. When growth regulators were applied to booting stage, the tiller number did not show significant difference, whereas the significant difference in culm length at harvest was observed in all treatment as a result of different concentration of growth regulators. The growth regulators generally exhibited a significant effect on yield component except on panicle length. Grain yield of low temperature treated plot at booting stage was significantly influenced by application of growth regulators. This was due to decreased number of spikelet and low filled spikelet percentage. However, TIBA treatment at booting stage showed no significant differences in grain yield.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.35 no.3
• /
• pp.184-194
• /
• 1990

This experiment was carried out at International Rice Research Institute (IRRI) farm to investigate the effect of plant growth regulators on lodging in rice and to determine plant characteristics when plant growth regulator applied at different concentrations and different times. The experimental plant growth regulator Hoe 78784 when applied at booting prevented lodging and significantly increased grain of IR 21820-154-3-2-3. However, they did not affect significantly the crop vegetative characteristics and yield component, except by decreasing plant height and internode elongation, and increasing the number of vascular bundles, and the thickness and diameter of the third and fourth internodes. But when applied at 30 DT, it significantly decreased grain yield of all test varieties due to shortened panicle length and increased unfilled spikelet percentage. Hoe 78784 applied at heading did not increase yield nor did it prevent lodging.

• Proceedings of the Korean Society for Bio-Environment Control Conference
• /
• 1994.05a
• /
• pp.102-103
• /
• 1994

원예작물의 개화는 일장이나 생장조절제 처리 이외에도 광도, 관수량, 그리고 시비수준 등 재배환경에 따라 영향을 받는다. 차광처리는 광합성률을 낮추어 개화를 지연시키며, 관수처리는 건조시 양분흡수가 저해되거나, 수분부족 자체가 스트레스로 작용하여 종자생산을 촉진시키는 생식생장으로의 전환을 유도할 가능성도 있다. 쑥갓은 국내에서 엽채류로 4계절을 통해 많이 이용되나 개화생리에 대한 연구가 미비하다. (중략)

• Journal of Life Science
• /
• v.8 no.5
• /
• pp.520-525
• /
• 1998

Effects of plant growth regulators and anti-oxidants for rapid multiplication of Cymbidium kanran were investigated. The best gelling agent was 2.5 g/1 gelrite which needed less quantity (about 28%) and half price than 9 g/1 chemi-cal agar. Undefined edible agar was only a little bit worse than chemical agar in growth, but the price was half as much as the latter. The higher concentration of BA and NAA, the deeper browning of medium that prevented from performing its functions of plant growth regulators. Polyvinylpyrrolidone (M.W. 40,000) was the most effective anti-oxidant other than ascorbic acid, aspartic acid, and rutin in protecting the browning of medium, enhancing the effect of plant growth regulators, and thus prolonging the subculture cycle. Vigorous seedlings were obtained by 0.1∼1.0 mg/1 BA,0.1 mg/1 NAA and 1 g/1 polyvinylpyrrolidone treatments. Therefore, the best result for growth and econo-mic aspects in rhizome culture of Cymbidium kanran were obtained by using MS basal medium with 2.5 g/1 gelrite, 1 g/1 polyvinylpyrrolidone, 0.1∼1.0 mg/1 BA and 0.1 mg/1 NAA.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.34 no.s01
• /
• pp.4-15
• /
• 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 Bio-Environment Control
• /
• v.6 no.4
• /
• pp.277-283
• /
• 1997

The effect of nutrient concentration and plant growth regulators on rooting of Coleus stem cuttings were investigated. In contrast to sand cutting, the nutrient solution or plant growth regulator treatment increased the root numbers and root length. The concentration of nutrient solution were 1, l/2 and 1/4 strength of the balanced nutrient solution developed by Japanese Horticultural Experimental Station and the highest root growth was obtained from 1/4 strength nutrient concentration. NAA or IBA treatment in culture solution stimulated the rooting and 0.01mg/l of NAA or IBA was effective in root development. Furthermore, days for rooting were shortened and root growth were promoted by mixing nutrient solutions with plant growth regulators and by using cutting with leaves. The rooting of Coleus was observed under microscope and the adventitious root formation initiated at 3 days after cutting with nutrient and auxin mixture.

• Proceedings of the Korean Society of Plant Biotechnology Conference
• /
• 2002.04b
• /
• pp.139-139
• /
• 2002

• 한국약용작물학회:학술대회논문집
• /
• 2007.11a
• /
• pp.269.2-269.2
• /
• 2007

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 1996.09a
• /
• pp.52-52
• /
• 1996