• Molecules and Cells
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• v.45 no.10
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• pp.695-701
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• 2022

Homeostatic regulation of meristematic stem cells accomplished by maintaining a balance between stem cell self-renewal and differentiation is critical for proper plant growth and development. The quiescent center (QC) regulates root apical meristem homeostasis by maintaining stem cell fate during plant root development. Cell cycle checkpoints, such as anaphase promoting complex/cyclosome/cell cycle switch 52 A2 (APC/C^CCS52A2), strictly control the low proliferation rate of QC cells. Although APC/C^CCS52A2 plays a critical role in maintaining QC cell division, the molecular mechanism that regulates its activity remains largely unknown. Here, we identified SCF^FBS1, a ubiquitin E3 ligase, as a key regulator of QC cell division through the direct proteolysis of CCS52A2. FBS1 activity is positively associated with QC cell division and CCS52A2 proteolysis. FBS1 overexpression or ccs52a2-1 knockout consistently resulted in abnormal root development, characterized by root growth inhibition and low mitotic activity in the meristematic zone. Loss-of-function mutation of FBS1, on the other hand, resulted in low QC cell division, extremely low WOX5 expression, and rapid root growth. The 26S proteasome-mediated degradation of CCS52A2 was facilitated by its direct interaction with FBS1. The FBS1 genetically interacted with APC/C^CCS52A2-ERF115-PSKR1 signaling module for QC division. Thus, our findings establish SCF^FBS1-mediated CCS52A2 proteolysis as the molecular mechanism for controlling QC cell division in plants.

• International Journal of Industrial Entomology and Biomaterials
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• v.3 no.1
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• pp.83-88
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• 2001

The effect of topical application with 200,400 and 600 $\mu$g/ml 2,4-dichlorophenoxyacetic acid (2,4-D) on the fifth larval stadium of the silkworm, B. mori, was analyzed. Larvae treated during fifth larval stadium enhanced larval, cocoon and adult parameters. The larval period was significantly decreased with increase in silk gland weight at 400 and 600 $\mu$g/ml, male cocoon weight and shel1 weight in all the treated groups and filament length and weight at 200 $\mu$g/ml treated group. Length of the ovariole, eggs per ovariole and hatching percentage increased significantly in all the treated groups when compared with those of the carrier control. This suggests that the plant growth regulator 2,4-D in addition to affecting silk production also affect reproductive performance.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2004.03a
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• pp.216-219
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• 2004

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.266.3-267
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• 2003

In order to induce production of methylnissolin, sterol biosyntheis inhibitor, in the adventitious root of Astragalus membranaceus the effect of methyl jasmonate(MeJ), a growth regulator of plant, was investigated. After treatment of MeJ (0$\mu\textrm{m}$, 10$\mu\textrm{m}$, 100$\mu\textrm{m}$) to the adventitious root which was harvested in the time interval of 0, 7, 14, 21, 28days and the fresh weight, dry weight and the contents methylnissolin was determined. (omitted)

• The Journal of Natural Sciences
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• v.18 no.1
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• pp.91-97
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• 2007

The Korean name "Bizooki" tree was named by the shape of winter bud which is like a slim bow. There are four scientific names in the tree which are Cleyera japonica Thunberg, Cleyera ochnacea DC, Sakakia ochnacea Nakai, and Ternstroemia gymnanthera. And the English name are Japanese Ternstroemia and Japanese Cleyera. "Bizooki" tree has planted at Buddhist temples in Japan for the ritual. The best result of stem cutting in "Bizooki" tree, 100 percent of rooting, could be accomplished in July when cuttings were done on the mixture-soil containing the same rates by volume of vermiculite, peatmoss and perlite with cuts processed with IBA 1,000 mg/l under the circumstances that 70% of shade, plastic mulching, and mist were conditioned.

• Korean journal of applied entomology
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• v.31 no.3
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• pp.289-303
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• 1992

Investigation of the environmental impact of widespread pesticide use has revealed a virtue/vice relationship. Although many pesticides perform their function and disappear without harm to the environment, others persist beyond their useful purpose and cause direct of indirect hazard to man, domestic animals and wildlife. Concurrently, many pests have rapidly adjusted to chemical control practices through changes in behavior that avoid exposure to pesticides of throuth genetic selection for populations resistant to the toxicants. The prospect of losing control over insect herbivores and desease vectors and returning to the days of global hunger and disease is unthinkable. Fortunately, from basic studies of insect and plant biology many opportunities for the development of safe, selective and environmentally pacific strategies for insect pest management are being realized.

• Advances in environmental research
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• v.12 no.1
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• pp.65-75
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• 2023

The effect of homobrassinolide (HBL) on the nutrient value of Curcuma longa L. (turmeric) rhizome grown in Nizamabad, Telangana State, India was studied. Application of homobrassinolide (HBL) as foliar spray to turmeric plants on the 20^th, 40^th and 60^th day from sowing resulted in enhanced chemical composition of turmeric rhizome. Application of homobrassinolide (HBL) resulted in enhanced total sugars, principal ingredient curcumin, total poly phenol content, total flavonoid content, total tannin content, crude fat, crude fibre and essential oils (turmerone, zingiberene, cineole and p-cymene) present in the turmeric rhizome indicating the ability of homobrassinolide (HBL) as a potential plant growth regulator (PGR).

• Journal of Plant Biotechnology
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• v.46 no.4
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• pp.310-317
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• 2019

Plant regeneration protocols for adventitious shoot organogenesis from apple (Malus domestica 'Fuji') leaf explants were developed in the present study. The effects of different basal media, types and concentrations of carbon sources, and concentrations of plant growth regulators were evaluated to determine the optimal shoot regeneration conditions for 'Fuji' apple leaf explants. On different treatments involving combinations of basal media, LS and N6 media, and different types and concentrations of cytokinins, 6-benzyl-adenine (BA) and thidiazuron (TDZ), shoot regeneration rates were the highest in the N6 medium combined with BA. Among the plant growth regulator and carbon source combination treatments, 5.0 mg/L BA, and 0.1 mg/L α-naphthalene acetic acid (NAA) with 40 g/L sorbitol was the optimal combination for shoot regeneration. In addition, the optimal sorbitol concentrations for shoot regeneration were 40 g/L and 60 g/L. The highest regeneration (81.8%) was achieved using 40 g/L sorbitol. The regenerated shoots elongated and rooted on rooting medium, consisting of 1/4 MS medium with 0.2 mg/L indole-3-butyric acid (IBA). The plantlets were acclimatized and the regenerated plants exhibited normal phenotypes.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2003.10b
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• pp.46-46
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• 2003

An important function of pollen aperture is believed to be regulating the water balance of the pollen when subjected to changes in humidity (Shukla, et al. 1998). It has been reported that mature barley pollen rapidly swells upon hydration and pollen tube emerges in a few minutes of germination (Anthony and Harlan, 1920). Although, there could be other factors responsible for rapid hydration of pollen. However, K is widely known for its rapid action as an osmotic regulator (Heslop-Harrison and Heslop-Harrison, 1996). In the present study, changes in K distrbution were traced during different stages of pollen maturation in barley. The existence of K at the aperture area of matured pollen may possibly play other import physiological roles. For example, K is reported to be an essential constituent of pollen germination and even required in higher concentration for pollen tube growth(Fan et al., 2001). These results suggest that there could be a possible relationship between K, located at the aperture area and rapid uptake of water by pollen.

• Korean Journal of Medicinal Crop Science
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• v.28 no.5
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• pp.354-359
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• 2020

Background: The recent, decline in Black-berry Magnolia Vine (Schisandra repanda; BMV) native to Jeju Island, Korea, has raised concerns about the causes of this decline. We investigated the native environment of S. repanda and evaluated its propagation through cuttings to provide preliminary data for its restoration in Jeju Island. Methods and Results: The native environment of the BMV in the Hallasan National Park was surveyed and the climatic variables (temperature and humidity) were analyzed. The effects of the sex of the donor plant (male/female) type of cutting (softwood/hardwood), and treatment with a plant growth regulator (indole-3-butylic acid/rootone) on the rooting of BMV were investigated. Additinallly, the rooting rate, root count, and root length, as well as temperature and humidity were measured in the vinyl moist chambers. BMV was observed in 63 plants distributed from 567 m to 1,364 m above sea level of the Hallasan National Park. In the cutting experiment, the rooting rate was 71.9%, and it was higer in female plants (75.0%) than in male plants (68.8%). Conclusions: The mass propagation of BMV through cuttings valuable for its restoration as without such safeguard measures, the population could face extinction within a few decades.