جستجوی مقالات مرتبط با کلیدواژه "growth regulator" در نشریات گروه "بیوتکنولوژی و ژنتیک گیاهی"

Hairy and adventitious roots are efficient systems for expressing recombinant proteins. In the present study, the amount of DrsB1-CBDAvr4 recombinant protein in hairy and adventitious root systems was compared. To this end, the effect of different factors on the optimization of culture conditions to obtain adventitious and hairy roots was evaluated in three separate experiments by assessment of biomass production in T1 transgenic plants expressing DrsB1-CBDAvr4 recombinant protein. The efficacy of Agrobacterium rhizogenesis in producing hairy roots was ensured using rolC gene specific primers. The insertion of DrsB1-CBDAvr4 recombinant peptide transgene in the genome of hairy and adventitious roots was confirmed by PCR analysis. Also, the level of DrsB1-CBDAvr4 protein was measured in hairy and adventitious roots by ELISA analysis. Analysis of the variance of data showed that the highest number of roots and the longest roots were obtained in MS media supplemented with 1 mg/L NAA and 0.5 mg/L IBA. The results of adventitious root biomass showed that liquid MS medium containing 1 mg/L of NAA hormone had a significant effect (P <0.01) on biomass production. More biomass was obtained in MS medium supplemented with 1mg/L NAA, whereas a lower fresh and dry weight was obtained in a 1/4 MS medium with no NAA. The results also showed that ATCC15834 strain with MS media supplemented with 3% sucrose, 10 minutes inoculation time was high efficiency to induce hairy roots in tobacco plants. The results of ELISA analysis showed that clones obtained from both roots showed a significant difference in terms of total protein content. The amount of recombinant protein from hairy roots was much higher than that of adventitious roots.

Ferulago (Ferulago ssp.) medicinal plant belongs to Apiaceae family and is endemic of Iran. Species of this genus are extremely endangered, considering the seed dormancy, excess harvesting and environmental stresses such as drought. By considering this plant as a valuable medicinal-rangeland plant, its production and reclamation is an essential task. This investigation was done to optimize micropropagation of two endemic species of Ferulago, included F. angulate and F. subvelutina. Maximum percentage of callus induction in F. angulata specie was reached as 100%, using rootlet explant (under treatments of 0 BAP + 1 NAA, 0 BAP + 1.5 NAA and 0 BAP + 2 NAA mg/l) and also true leaf explants (under treatments of 0.5 BAP + 0.5 NAA and 1 BAP + 2 NAA mg/l), and in F. subvelutina specie using true leaf explants (under treatments of 0.5 BAP + 0.5 NAA and 1 BAP + 2 NAA mg/l) respectively as 72.33 and 71.66%. The combined application of the cytokinin and auxin phytohormones has been shown to be effective in regenerating Ferulago species; so that the maximum regeneration was reached as 53.33 and 46.66% in F. angulata respectively under treatments of 0.5 BAP + 0.2 NAA mg/l and 0.5 BAP + 0.4 NAA mg/l and so on as 53.33 and 60 percent in F. subvelutina respectively under treatments of 1 BAP + 0.2 NAA mg/l and 1 BAP + 0.4 NAA mg/l. The best rooting treatment in both species was selected as the ½ MS cultural medium included 0.5 mg/l IBA. The adaptation stage was done in a mixture of soil, peat soil and sand with a weight ratio of 1: 1: 1, in which the total of 80% of regenerated plants from tissue culture, were successfully adapted to the outside environment.

Geranium is one of the most economically important pot plants in the world and is widely used in landscape. In order to produce disease-free and homogenic plants, proliferation by tissue culture is one of the alternative methods for mass production of this valuable plant. The aim of this study was to achieve an efficient and rapid method for micropropagation of Geranium by comparing leaf discs, petiole, stem and root explants on MS and B5 media.

For callus induction, stem, leaf and root explants were cultured on MS basal medium with 11 different kinds of hormonal combination, containing auxin (NAA and IAA) and cytokinin (BAP, Kin and Zeatin) with various concentrations. For direct regeneration of stem, leaf and petiole explants, 10 different culture media were used in MS and B5. After shooting, the explants were transferred to B5 culture medium containing auxin (0.5 mg/l NAA and 0.5 mg/l IAA) for root induction.

The best hormonal treatment for callus induction was 1mg/l NAA+10mg/l Kin by using stem and leaf explants as 92.5% and 88.75%, respectively. Also, the maximum fresh and dry weight of callus were related to stem explants on MS culture medium included 1mg/l NAA+10mg/l Kin, which were not significantly different from leaf explants on the same culture medium. The maximum percentage of direct regeneration and number of branches, respectively as 71.25% and 7.12 shoots, were related to stem explant on B5 medium containing 2mg/l BAP+1mg/l Zeatin, and the maximum shoot length, as 2.56 cm, was observed during direct regeneration in MS culture medium included 0.2 mg/l NAA+0.5 mg/l BAP+1 mg/l Zeatin. The shoots were successfully rooted and adapted to the environment.

The results of the present study were showed that the micropropagation of ornamental geranium plant is affected by the type of explant, the concentration of growth regulators and the type of culture medium and the stem explant is efficient in callus induction and direct regeneration.

Fewer side effects of medicinal plants compared to chemical drugs have caused them to receive increasing attention. Fennel is one of the most important and valuable medicinal plants due to its numerous healing properties and the presence of several valuable medicinal active substances. Due to the medicinal importance of this plant and the possibility of producing its metabolites in vitro, it is necessary to study the factors affecting the production of these metabolites; In addition, an efficient protocol for indirect regeneration and gene transfer can be provided. For this purpose, a factorial experiment based on a completely randomized design with three replications was conducted in 2018. Factors included genotype (French and Isfahan), MS medium enriched with 2,4-D (1, 2 and 5 mg.l-1) and BAP (0, 0.1 and 0.5 mg.l-1) plant growth regulators as well as tissue Explants (root, hypocotyl and cotyledon). According to the results, the hypocotyl explant of Isfahan genotype had the highest callus fresh weight in culture medium containing 1 mg.l-1 2,4-D. The French genotype had a higher fresh weight in culture medium containing 0.5 mg.l-1 BAP. The highest callus dry weight was obtained in hypocotyl explants of French genotype with rich culture medium with 1 mg.l-1 2,4-D and 0.5 mg.l-1 BAP. Regarding callus size characteristics, the cotyledon explant in culture medium enriched with 1 mg.l-1 2,4-D had the best reaction. The cotyledon explant had the best callus induction in all treatment’s compounds

Senna (Cassia angustifolia Vahl.), known as an important medicinal plant, belongs to the Caesalpiniaceae family used in the treatment of some diseases such as skin infections, constipation, and intestinal worms. The aim of this study was to optimize the micropropagation of this plant. For this purpose, senna seeds were first disinfected and cultured in MS medium and the nodular stem parts were used as explants. The treatments were used to optimize the propagation medium supplemented with different concentrations of cytokinins, BA and Kin (0, 1, 2, and 4 mgL-1) in combination with NAA (0 and 0.25 mgL-1). After finding the best type and concentration of cytokinin for propagation (cytokinin BA), this growth regulator was tested in combination with various auxins to optimize the proliferation of the explants. In this experiment, BA was evaluated at three concentrations (0.5, 1, and 2 mgL-1), in combination with NAA, IAA, and IBA at two concentrations (0 and 0.25 mgL-1).  The propagated shoots (at least 3 cm long) were then exposed to two types of auxin NAA and IBA at different concentrations (0, 0.3, 0.6, and 0.9 mgL-1) to induce rooting. The results indicated that 1 mgL-1 BA treatment in combination with 0.25 mgL-1 NAA induced the maximum shoot proliferation (2.93 shoots per explant) and leaf number (21.6 leaves per shoot). Finally, NAA with 0.25 mg / l BA treatment at the concentration of 1 mgL-1 in combination with 0.25 mgL-1 NAA, was selected as the best treatment for the propagation of the explants. Maximum rooting induction obtained in 0.3 mgL-1 IBA treatment which was not significantly different from 0.3 mgL-1 NAA. Moreover, application of IBA at the concentration of 0.9 mgL-1 caused the higher mean values of root number and root length, so that it increased by 172.22 and 73.41% of the mentioned traits compared to the control, respectively. The results of this study can be used in micropropagation and extensive proliferation of this plant.

Wild almond (Amygdalus scoparia Spach), is one of valuable almond species in Iran with medicinal and nutritional values as well as soil conservation and other environmental characteristics, which is also utilized as a rootstock in cultivation of domestic almond cultivars. After in vitro culturing of embryos of the species and enough shoot growth on DKW medium, with growth regulators such as IBA, BA and TDZ in 0.01, 0.5 and 0.05 mg.l-1 respectively, effects of light and growth regulators on rooting ability of the embryo driven shoots were investigated, using a factorial statistical model, based on a completely randomized design. Light as the first factor with 2 levels (a: 16 hours light and 8 hours darkness, b: permanent darkness for ten days) and growth regulators of DKW culturing medium as the second factor in 5 levels (1: NAA‐ each for 1 mg.l-1, 2: NAA for 1 mg.l-1 , 3: IBA for 1 mg.l-1 , 4: IBA for 0.5 mg.l-1, 5: NAA for 0.5 1 mg.l-1) were used. Based on the results of analysis of variance, the two factors of light and growth regulator had significant effects on all of the studied characteristics. Light caused better growth of embryo grown shoots, compared to darkness. Various levels of growth regulators had also different effects on shoot and root production. Using a combination of IBA and NAA, produced the highest number of main roots. But 1mg. l-1 IBA caused the longest main root as well as higher number and length of lateral roots. Interaction effects between light and growth regulators significantly affected shoot length, main root length, number and length of lateral roots. So that combination of the two growth regulators produced the most number of lateral roots, whereas, utilizing 1 mg.l-1 NAA in darkness resulted in the most number of lateral roots. Results of analysis of variance indicated significant effects of light and culturing media factors on all of the studied characteristics. So that light caused remarkable increments on all of the studied characteristics. Various levels of applied growth regulators caused different effects on the studied characters. Meanwhile, IBA growth regulator caused significant increment of number and length of main and lateral roots. But NAA growth regulator showed significant effects on shoot length and number of leave. Interaction between light and media factors had significant effects on shoot length, main root length, number and length of lateral roots. Alternate light and darkness as well as IBA growth regulator are necessary for asexual propagation of wild almond through micropropagation.