The dual role of carbenicillin in shoot regeneration and somatic embryogenesis of horseradish (Armoracia rusticana) in vitro

2010 ◽  
Vol 102 (3) ◽  
pp. 397-402 ◽  
Author(s):  
A. M. Shehata ◽  
W. Wannarat ◽  
R. M. Skirvin ◽  
M. A. Norton
Keyword(s):  
Somatic Embryogenesis ◽  
Shoot Regeneration ◽  
Dual Role ◽  
Armoracia Rusticana

scholarly journals Conjugation of Hydroxyethyl Starch to Desferrioxamine (DFO) Modulates the Dual Role of DFO in Yersinia enterocolitica Infection

2000 ◽  
Vol 7 (3) ◽  
pp. 457-462 ◽  
Author(s):  
Sören Schubert ◽  
Ingo B. Autenrieth
Keyword(s):  
Yersinia Enterocolitica ◽  
Hydroxyethyl Starch ◽  
Growth Promotion ◽  
Iron Chelator ◽  
Dual Role ◽  
Host Cells ◽  
Immunosuppressive Action

ABSTRACT The iron chelator desferrioxamine (DFO) B is widely used in the therapy of patients with iron overload. As a side effect, DFO may favor the occurrence of fulminant Yersinia infections. Previous work from our laboratory showed that this might be due to a dual role of DFO: growth promotion of the pathogen and immunosuppression of the host. In this study, we sought to determine whether conjugation of DFO to hydroxyethyl starch (HES-DFO) may prevent exacerbation ofYersinia infection in mice. We found HES-DFO to promote neither growth of Yersinia enterocolitica nor mitogen-induced T-cell proliferation and gamma interferon production by T cells in vitro. Nevertheless, in vivo HES-DFO promoted growth ofY. enterocolitica possibly due to cleavage of HES and release of DFO. The pretreatment of mice with DFO resulted in death of all mice 2 to 5 days after application of a normally sublethal inoculum of Y. enterocolitica, while none of the mice pretreated with HES-DFO died within the first 7 days postinfection. However, some of the HES-DFO-treated mice died 8 to 14 days postinfection. Thus, due to the delayed in vivo effect HES-DFO failed to triggerYersinia-induced septic shock, which accounts for early mortality in DFO-associated septicemia. Moreover, our data suggest that DFO needs to be taken up by host cells in order to exert its immunosuppressive action. These results strongly suggest that HES-DFO might be a favorable drug with fewer side effects than DFO in terms of DFO-promoted fulminant infections.

In Vitro Shoot Regeneration of NAA-Pulse Treated Plumular Leaf Explants of Cowpea

2010 ◽  
Vol 2 (2) ◽  
pp. 60-63 ◽  
Author(s):  
Muhammad AASIM
Keyword(s):  
Somatic Embryogenesis ◽  
Shoot Regeneration ◽  
Leaf Explants ◽  
Leaf Explant ◽  
Grain Legume ◽  
Ms Medium ◽  
Pulse Treatment ◽  
Mature Embryos ◽  
Legume Crop

Cowpea (Vigna unguiculata L.) is an economically important grain legume crop and is an important source of dietary protein in many of the developing countries. The present study reports the effect of pulse treatment duration, concentration of NAA and presence of NAA in the culture medium on shoot regeneration from plumular leaf explant of Turkish cowpea cv. ‘Akkiz’ and ‘Karagoz’. Pulse treatment of mature embryos with 20 mg l-1 NAA for 1 and 3 weeks followed by culturing of plumular leaf explant on MS medium containing 0.25, 0.50 and 1.0 BAP with 1.0, 2.0 and 4.0 mg l-1 NAA promoted somatic embryogenesis in both cultivars. Longer duration of pulse treatment was deleterious resulting in browning and consequently death of the embryos on explants. Pulse treatment with 20 mg l-1 NAA for one week was less deleterious and developed two plantlets after the explants were transferred to MS0 medium after 6 weeks through somatic embryogenesis in cv. ‘Akkiz’. Pulse treatment with 10 mg l-1 NAA for 1 week showed 33.33-50.00% and 25.00-50.00% shoot regeneration frequency in cv. ‘Akkiz’ and ‘Karagoz’ respectively on MS medium containing 0.25-1.00 mg l-1 BAP. Maximum number of 2.50 shoots each per explant were recorded in cv. ‘Akkiz’ and ‘Karagoz’ on MS medium containing 1.00 and 0.50 mg l-1 BAP respectively. Contrarily, maximum shoot length of 8.98 cm of cv. ‘Akkiz’ and 9.42 cm of cv. ‘Karagoz’ was recorded on MS medium containing 0.50 mg l-1 BAP and 1.00 mg l-1 BAP respectively. Regenerated shoots were rooted on MS medium containing 0.5 mg l-1 IBA and and acclimatized in growth room at room temperature where they produced viable seeds.

scholarly journals 5-Azacytidine: A Promoter of Epigenetic Changes in the Quest to Improve Plant Somatic Embryogenesis

2018 ◽  
Vol 19 (10) ◽  
pp. 3182 ◽  
Author(s):  
Pedro Osorio-Montalvo ◽  
Luis Sáenz-Carbonell ◽  
Clelia De-la-Peña
Keyword(s):  
Gene Expression ◽  
Dna Methylation ◽  
Somatic Embryogenesis ◽  
Regulation Of Gene Expression ◽  
Culture Conditions ◽  
Short Time ◽  
Time Frames ◽  
Different Sources

Somatic embryogenesis (SE) is a widely studied process due to its biotechnological potential to generate large quantities of plants in short time frames and from different sources of explants. The success of SE depends on many factors, such as the nature of the explant, the microenvironment generated by in vitro culture conditions, and the regulation of gene expression, among others. Epigenetics has recently been identified as an important factor influencing SE outcome. DNA methylation is one of the most studied epigenetic mechanisms due to its essential role in gene expression, and its participation in SE is crucial. DNA methylation levels can be modified through the use of drugs such as 5-Azacytidine (5-AzaC), an inhibitor of DNA methylation, which has been used during SE protocols. The balance between hypomethylation and hypermethylation seems to be the key to SE success. Here, we discuss the most prominent recent research on the role of 5-AzaC in the regulation of DNA methylation, highlighting its importance during the SE process. Also, the molecular implications that this inhibitor might have for the increase or decrease in the embryogenic potential of various explants are reviewed.

scholarly journals SOMATIC EMBRYOGENESIS OF CASSAVA (MANIHOT ESCULENTA CRANTZ) VAR. KM297

2011 ◽  
Vol 14 (3) ◽  
pp. 14-22
Author(s):  
Kien Van Vu ◽  
Sanh Du Nguyen
Keyword(s):  
Somatic Embryogenesis ◽  
Manihot Esculenta ◽  
Somatic Embryos ◽  
Light Condition ◽  
Ms Medium ◽  
Dark Condition ◽  
Manihot Esculenta Crantz ◽  
Immature Leaf

Somatic embryos of cassava var. KM297 received from pieces of in vitro immature leaf lobes or cotyledon of somatic embryos, were induced on the MS medium supplemented with 8mg/l picloram after 13 days inoculation in the dark condition. Different states of embryo were obtained after 10 days cultured on MS medium supplemented with 0.1 mg/l BA and 0.01mg/l NAA, in the light condition. Role of endogenous AIA and Zeatin of the globular state of embryos was studied.

scholarly journals Interleukin-17A Interweaves the Skeletal and Immune Systems

2021 ◽  
Vol 11 ◽  
Author(s):  
Mengjia Tang ◽  
Lingyun Lu ◽  
Xijie Yu
Keyword(s):  
Inflammatory Cells ◽  
Bone Diseases ◽  
Dual Role ◽  
Skeletal System ◽  
Interleukin 17A ◽  
Immune Mediated ◽  
Skeletal Homeostasis ◽  
Axial Spondylarthritis

The complex crosstalk between the immune and the skeletal systems plays an indispensable role in the maintenance of skeletal homeostasis. Various cytokines are involved, including interleukin (IL)-17A. A variety of immune and inflammatory cells produces IL-17A, especially Th17 cells, a subtype of CD4+ T cells. IL-17A orchestrates diverse inflammatory and immune processes. IL-17A induces direct and indirect effects on osteoclasts. The dual role of IL-17A on osteoclasts partly depends on its concentrations and interactions with other factors. Interestingly, IL-17A exerts a dual role in osteoblasts in vitro. IL-17A is a bone-destroying cytokine in numerous immune-mediated bone diseases including postmenopausal osteoporosis (PMOP), rheumatoid arthritis (RA), psoriatic arthritis (PsA) and axial spondylarthritis (axSpA). This review will summarize and discuss the pathophysiological roles of IL-17A on the skeletal system and its potential strategies for application in immune-mediated bone diseases.

GhAIL6, a Member of the AP2 Family Gene, Promotes Somatic Embryogenesis in Cotton.

2021 ◽  
Author(s):  
Congcong Ma ◽  
Yilin Li ◽  
Xiaorui Zhang ◽  
Dan Ma ◽  
Ruibin Sun ◽  
...  
Keyword(s):  
Somatic Embryogenesis ◽  
Large Family ◽  
Intact Plants ◽  
Transgenic Breeding ◽  
Callus Production ◽  
Transcription Factor Genes ◽  
Family Gene ◽  
Ap2 Family

Abstract Background Somatic embryogenesis (SE) is the process by which plant somatic cells are cultured in vitro without fertilization to regenerate embryos and develop into intact plants, the difficulty of cotton regeneration has severely limited functional gene research and transgenic breeding. The AP2 family is a relatively large family of transcription factor genes that regulate the process of growth and development, but the role of Aintegumenta-Like6 ( AIL6) in cotton SE has not been reported. Methods The 35S::AIL6:GR vector was constructed and transformed into cotton JH713 by Agrobacterium-mediated method, after 3 years of self-breeding, stable genetic T3 generation positive plants were obtained, identified by Southern, and three lines were selected for the following regeneration experiments.Results The results showed that overexpression of GhAIL6 significantly inhibited the proliferation of callus during the first 30 days, and promoted the embryogenic callus production at about 45 days.Couclusion Our results indicated that GhAIL6 was a key regulator of cotton SE, overexpression of GhAIL6 helped to improve the regeneration efficiency of cotton SE

scholarly journals Regulation of in vitro somatic embryogenesis with emphasis on to the role of endogenous hormones

2001 ◽  
Vol 13 (2) ◽  
pp. 196-223 ◽  
Author(s):  
VÍCTOR M. JIMÉNEZ
Keyword(s):  
Somatic Embryogenesis ◽  
Plant Growth ◽  
Growth Regulators ◽  
Culture Medium ◽  
Endogenous Hormones ◽  
Tissue Cultures ◽  
Factors Associated ◽  
General Aspects

Different aspects of the in vitro somatic embryogenesis regulation are reviewed in this paper.work. A description of g General aspects, such as terminology, uses, stages of development and factors associated with the somatic embryogenesis, are described. is carried out. Although a brief description ofn the effects of the addition of different plant growth regulators to the culture medium wasis given, the article is centereds itself on the effect that the endogenous hormone concentrations in the initial explants and in the tissue cultures derived from them could play oin the induction and expression of somatic embryogenesis. It is significant that few to emphasize the low amount of systematic studies have been conducted, in this subject, in which different species and hormone groups were compared in cultures with and without embryogenic capacity. Moreover, the lack of correlation between the results presented in different studies the distinct works indicates that the hormone content of the cultures is not the only factor involved.

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