Biotechnology
m. Noruzpuor; n. Zare; R. Asghari Zakaria; P. Sheikhzade
Abstract
Microbial contamination is one of the main challenges and influential factors in the response of explants under in vitro cultures, especially in woody plants where the explants are prepared from natural habitats. In the present study, to investigate the effects of benomyl on microbial contamination and ...
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Microbial contamination is one of the main challenges and influential factors in the response of explants under in vitro cultures, especially in woody plants where the explants are prepared from natural habitats. In the present study, to investigate the effects of benomyl on microbial contamination and growth of Vaccinium arctostaphylos L. node explants, MS containing different concentrations of benomyl (0-2000 mg.L-1) was used. Furthermore, to investigate the interaction of benomyl, basal medium, and hormonal composition on the growth response of explants, different basal media (MS, AN, and WPM) containing IBA (0.1 mg.L-1), cytokinin (Zeatin, BAP, and TDZ, each at concentrations of 0, 0.5, 1, and 2 mg.L-1), and benomyl (0 and 150 mg.L-1) were studied. The results showed that benomyl in MS medium had no significant effect on the explants contamination, but use of lower benomyl concentrations (400 mg.L-1 or less) could provide better growth conditions. Interaction of treatments significantly affected the percentage of survival and explants foliation. MS contained benomyl showed higher percentage of survival and foliation than MS without benomyl, but in AN and WPM media, the percentage of survival and foliation were significantly decreased in the presence of benomyl. Furthermore, in AN and WPM media contained cytokinin, the presence of benomyl significantly reduced the foliation percentage, while in MS medium, the effect of benomyl was different depending on the concentration and cytokinin type.
R. Hazrati Jahan; N. Zare; S. Dezhsetan; P. Sheikhzadeh Mosaddeg
Abstract
The discovery of taxanes production in hazelnut (Corylus avellana L.) and its cell cultures has generated considerable interest and hopes for studying and utilization of cell suspension culture of hazelnut as a biotechnological approach to the taxol production. In this research, the effects of ...
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The discovery of taxanes production in hazelnut (Corylus avellana L.) and its cell cultures has generated considerable interest and hopes for studying and utilization of cell suspension culture of hazelnut as a biotechnological approach to the taxol production. In this research, the effects of plant growth regulators (different levels of 2,4-D, NAA, Kin and BAP) on hazelnut cell culture growth, and effects of elicitor (methyl jasmonate, chitosan and ultrasonund) and precursor (aminobenzoic acid and phenylalanine) combination on taxol production in cell suspension cultures were investigated. The results revealed that hazelnut cell growth in suspension cultures was significantly influenced by growth regulators treatments. Cell growth in MS medium containing 1 mg/l 2,4-D, 0.5 mg/l BAP and 150 mg/l ascorbic acid was significantly higher than other treatments. The cell growth and viability, EC and pH of medium and taxol production were significantly different between elicitor treatments. Overall, elicitor treatments inhibited cell proliferation but significantly increased the taxol production compared to the control (without elicitor). The highest taxol content (15.27 mg/l) was obtained with 2 min US and 20 mg/l aminobenzoic acid treatment in the cells derived from seed explants, which was about 132.78- fold of control.
S. Zishan; R. Asghari Zakaria; N. Zare
Abstract
Nigella Sativa L. is an annual plant from Ranunculacea family. Its seeds contain protein, alkaloids, kinons, saponin, and volatile essential oil used as antibacterial agent and treatment of some diseases. This study was aimed to investigate the polyploidy induction in Nigella sativa via seed treatment ...
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Nigella Sativa L. is an annual plant from Ranunculacea family. Its seeds contain protein, alkaloids, kinons, saponin, and volatile essential oil used as antibacterial agent and treatment of some diseases. This study was aimed to investigate the polyploidy induction in Nigella sativa via seed treatment at colchicine concentrations of 0, 0.025%, 0.05%, 0.1%, and 0.2% for 8, 24 and 48 hours. The study was conducted in a factorial experiment based on completely randomized design with three replications. The percentage of tetraploid plants was determined through the morphological and chromosomal studies. Results of analysis of variance showed that effects of colchicine level, treatment duration, and the interaction between them were significant on the survival of plants and percentage of tetraploidy induction. The seed germination and viability of plants significantly decreased with increasing of colchicine concentration and treatment duration. The lowest number of survived plants was observed at a concentration of 2.0% colchicine and a treatment time of 24 and 48 hours. The highest percentage of induced tetraploid plants (9.9%) was obtained at a concentration of 0.05% colchicine with a treatment time of 48 hours, showing no significant difference with concentrations of 1 and 2 % at the same treatment time. The plants treated with colchicine showed higher plant height, internodes length, capsule width and length compared to that of control plants. Furthermore, they had larger stomata with lower number as compared with diploid plants.
