Abstract
Guayusa (Ilex guayusa) is an endemic plant from the Amazon with potential medicinal applications. Indigenous people are familiar with such applications and use guayusa based on ancestral knowledge. There is a growing interest in guayusa-based products in urban areas of Ecuador and internationally. The supply cannot meet the demand. Currently, traditional practices are used for guayusa growth and the potential use of the protected forest is foreseen. This work describes a protocol for the in vitro propagation of guayusa, a sustainable solution to generate high quality plants in reduced space. Stakes obtained from stems were used as explants. Chemical sterilization with ethanol and sodium hypochlorite resulted in 100% surface-sterilized stakes. The growth medium mWPM resulted in favorable outcomes regarding shoot development and elongation, as well as rooting. Supplementation with activated charcoal resulted in reduced browning, only 10% of the shoots presented necrosis during the elongation phase. More than two thirds of shoots were able to develop roots spontaneously. Medium supplementation with the auxin indole-3-butyric acid, IBA, may be considered when rooting does not occur spontaneously. Acclimatization was performed in soil. The protocol was tested under different light spectra, revealing that guayusa growth is affected by light quality. The photobiology of this shade tolerant plant requires further characterization, but the data uncovered a potential role for green and far-red light in root development.
Key message
Guayusa was propagated on mWPM medium supplemented with activated charcoal. Spontaneous root development occurred in most shoots. Light quality affected plant development, green and far-red light could influence root growth.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AC:
-
Activated charcoal
- B:
-
Blue light
- FR:
-
Far-red light
- G:
-
Green light
- IBA:
-
Indole-3-butyric acid
- LED:
-
Light-emitting diode
- MS:
-
Murashige & Skoog
- mWPM:
-
Modified Woody Plant Medium
- NAA:
-
1-Naphthaleneacetic acid
- R:
-
Red light
- STN:
-
Shoot tip necrosis
- W:
-
White light
- WPM:
-
Woody Plant Medium
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Acknowledgements
The LED sources were installed in the plant tissue culture room with the dedicated contribution from Nelson Herrera and the Physical Plant Team of USFQ. We thank Runa Foundation for sharing the guayusa plants used as source material, the Laboratory of Plant Biotechnology at USFQ for daily and continuous support during the development of this project, and Wa and David Garcia for sharing information on methods used for guayusa growth and details on production systems. We thank Venancio Arahana, Andrea Montero and María Mercedes Cobo for assisting in experimental design of preliminary propagation trials. We thank Raquel Carvalho for helpful discussion and reviewing of the manuscript.
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This work was supported by Fundación Runa and by Universidad San Francisco de Quito USFQ, Colegio de Ciencias Biológicas y Ambientales COCIBA Grants – Hubi 12431.
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MLT supervised the project. MLT, SC conceptualized the project. SC, MaO, and MLT designed the experiments, examined results. MaO, MiO, and MR performed the experiments, compiled and analyzed the data. KF made available the light sources and provided insight in result interpretations. SC and MaO prepared and wrote the manuscript. MLT provided feedback and editions during manuscript preparation. SC and MLT obtained funding for the study, oversaw experiments. All authors approved the manuscript.
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Carvalho, S.D., Ortega, M., Orellana, M. et al. In vitro propagation of the Amazonian medicinal plant guayusa (Ilex guayusa) and effects of light in the growth and development of this shade tolerant plant. Plant Cell Tiss Organ Cult 147, 503–517 (2021). https://doi.org/10.1007/s11240-021-02142-y
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DOI: https://doi.org/10.1007/s11240-021-02142-y