African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 780

Full Length Research Paper

Role of endomycorrhizae and Pseudomonas fluorescens on the acclimatization of micropropagated Stevia rebaudiana Bert. plantlets

Mona S. Zayed
  • Mona S. Zayed
  • Microbiology Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt.
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Ghada Abd El-Moneim Hegazi
  • Ghada Abd El-Moneim Hegazi
  • Tissue Culture Unit, Genetic Resources Department, Desert Research Center, Cairo, Egypt.
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Hanaa Mohammed Salem
  • Hanaa Mohammed Salem
  • Botany and Microbiology Department, Faculty of Science, Al-Azhar University (Girls Branch), Cairo, Egypt.
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Walaa Mohammed Ibrahim Ali Adas
  • Walaa Mohammed Ibrahim Ali Adas
  • Tissue Culture Unit, Genetic Resources Department, Desert Research Center, Cairo, Egypt.
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  •  Received: 02 November 2016
  •  Accepted: 02 February 2017
  •  Published: 31 March 2017

Abstract

Stevia rebaudiana Bert. is a non-caloric sweetener plant of medicinal and commercial values. This study was performed to micropropagate Stevia and improve its ability to withstand the sudden shocks of the environmental changes during acclimatization by using endomycorrhizae and/or Pseudomonas fluorescens. In vitro establishment of Stevia was superior by culturing shoot tips and nodal segments of mature plants on Murashige and Skoog medium supplemented with 0.5 mg/l 6-benzyl adenine and 1 mg/l β-naphthalene acetic acid, and nodal segments gave better response when compared to shoot tips. While 6-benzyl adenine alone at 1 mg/l was found to be the most promising concentration for shoots multiplication for four successive subculturing. The best rooting response was obtained on half strength Murashige and Skoog medium supplemented with 1 mg/l β-naphthalene acetic acid. Adding 8 ml/l mycorrhizal root extract gave 100% rooting with the highest mean number and length of roots and shoot height. Inoculation of plantlets with endomycorrhizal spores alone in non-sterilized soil increased the survival percentage to 90% and gave the highest mean number and length of both shoots and roots, as well as leaves number. Moreover, they recorded the highest values of total chlorophyll, NPK and relative water contents.

Key words: Stevia, micropropagation, mycorrhizae, mycorrhization helper bacteria.

Abbreviation

BA, 6-benzyl adenine; GA3, gibberellic acid, HPLC, high-performance liquid chromatography; IBA, indole-3-butyric acid; Kn, kinetin; MIRE,  mycorrhizal infected root extract; MS, Murashige and Skoog; NAA, β-naphthalene acetic acid; NaOCl, sodium hypochlorite solution; PGRs, plant growth regulators; PsFS, Ps. fluorescens free supernatant.