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Growth, metabolic profiling and enzymes activities of Catharanthus roseus seedlings treated with plant growth regulators

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Abstract

The effect of different growth regulators on growth and the production of terpenoid indole alkaloids as well as some enzymes involved in the biosynthesis were studied in Catharanthus roseus seedlings. The seedlings were grown on MS solid medium containing different concentrations of each growth regulator for a period of one month. Extracted alkaloids were analyzed by HPLC for determination of terpenoid indole alkaloid quantities. Continuous availability of growth regulators induced different alkaloids with variable effects among the regulators. Gibberellic acid at concentration of either 5.8 μM or 11.6 μM resulted in elongation of shoots with lowering the number of leaves. Abscisic acid has a retardant effect on growth. Ethylene did not effect the growth pattern at concentration of 100 μM but seedlings were not tolerant to higher concentrations. Methyljasmonate reduced the growth of the root system. Methyljasmonate was a general inducer for all alkaloids and increased the activity of strictosidine glucosidase. Ethylene applications promoted the pathways towards ajmalicine, serpentine, tabersonine and vindoline. Similar effect as for ethylene was observed for abscisic acid. Salicylic acid treatment increased the production of serpentine, tabersonine and higher concentration of salicylic acid induced vindoline accumulation. Peroxidase activity was also induced by salicylic acid. Gibberellic acid has little effect on alkaloid levels.

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Authors and Affiliations

  1. Department of Pharmacognosy, Section of Metabolomics, Institute of Biology Leiden, Leiden University, The Netherlands

    Magdi El-Sayed & Rob Verpoorte

  2. Department of Botany, Faculty of Science, South Valley University, Egypt

    Magdi El-Sayed

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  1. Magdi El-Sayed
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  2. Rob Verpoorte
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El-Sayed, M., Verpoorte, R. Growth, metabolic profiling and enzymes activities of Catharanthus roseus seedlings treated with plant growth regulators. Plant Growth Regulation 44, 53–58 (2004). https://doi.org/10.1007/s10725-004-2604-5

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  • DOI: https://doi.org/10.1007/s10725-004-2604-5

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