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In vitro propagation of Notocactus magnificus

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Abstract

Most commercially grown cacti can be easily propagated by seed and/or cuttings. A group of rare and endangered species does not fit into this category and is therefore a good candidate for in vitro propagation productions as a tool to overcome habitat and plant-destruction. The number of rare and endangered species of Cacti goes into about 100. Many show a low production and germination of seeds and plantlets are prone to damping-off, making the in vitro propagation a feasible alternative for the multiplication and conservation of their germplasm. The aim of the present investigation is to establish a protocol for the in vitro culture and plant regeneration of Notocactus magnificus, the blue cactus, a highly ornamental species, native to Brazil. The surface sterilization of the explants was achieved with immersion for 10 min in sodium hypochlorite solution for either seeds (0.25% v/v) or ribs segments (1% v/v). Callus formation was observed when explants were cultured on MS medium supplemented with sucrose at 2% (w/v), 2,4-dichlorophenoxyacetic acid 0.5 μM, benzylaminopurine 4.4 μM, thiamine HCl 0.4 mg l−1 and i-inositol 100 mg l−1. The regeneration of shoots was carried out on MS medium supplemented with either different concentrations of benzylaminopurine and 1-naphthaleneacetic acid, or kinetin and indole-3-acetic acid. The highest number of shoots occurred when MS medium was supplemented with benzylaminopurine 22.2 μM, sucrose 3% (w/v) and agar 0,6% (w/v). In vitro spontaneous rooting of shoots was observed after eight months under culture on MS medium. Only in vitro rooted shoots developed into normal plants under glasshouse culture conditions. This in vitro protocol should be useful for the conservation as well as mass propagation of Notocactus magnificus.

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Abbreviations

BAP:

benzylaminopurine

2,4-D :

2,4-dichlorophenoxyacetic acid

IAA:

indole-3-acetic acid

Kinetin:

6-furfurylaminopurine

2iP:

N6-(Δ2-isopentenyl) adenine

IBA:

indole-3-butyric acid

MS:

Murashige and Skoog medium

NAA:

1-naphthaleneacetic acid

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Acknowledgements

The authors would like to thank the financial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/PIBIC) and Cactus Hino, Jundiaí, SP, Brazil.

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Correspondence to Luiz Antônio Gallo.

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de Medeiros, L.A., de Ribeiro, R.C.S., Gallo, L.A. et al. In vitro propagation of Notocactus magnificus . Plant Cell Tiss Organ Cult 84, 165–169 (2006). https://doi.org/10.1007/s11240-005-9014-x

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  • DOI: https://doi.org/10.1007/s11240-005-9014-x

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