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Eucalyptus nitens plant regeneration from seedling explants through direct adventitious shoot bud formation

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Abstract

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A protocol for true-to-type plantlets production by direct adventitious bud proliferation from Eucalyptus nitens hypocotyl segments was developed.

Abstract

Hypocotyls, cotyledons, and expanded leaves of Eucalyptus nitens were cultured in Murashige and Skoog (MS) medium containing naphthalene acetic acid or indole-3-acetic acid (IAA) and 6-benzyl adenine (BA). The most effective treatment for shoot bud formation, 0.5 μM IAA and 2.5 μM BA, was used in additional experiments. After 30 days of culture, the highest rate of regeneration (40 ± 5.8%) and the maximum number of buds differentiated per hypocotyl explant (10.3 ± 4) were obtained when explants were subjected to darkness for the first 10 days and then transferred to light-emitting diode lights mimicking daylight for 20 days of incubation. Histological examination confirmed direct shoot regeneration of E. nitens. For shoot growth, half-strength MS plus 0.09 M sucrose under forced ventilation yielded elongated shoots after 1 month. After 12 weeks from the onset of an experiment, 40 ± 11.5% of elongated shoots produced 5.3 ± 0.8 roots after pretreatment with indole-3-butyric acid aqueous solution and culture on basal medium without plant growth regulators under a temporary immersion system. Inter simple sequence repeat (ISSR) marker analysis revealed the genetic uniformity among the in vitro raised plants, demonstrating the reliability of the procedure.

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Acknowledgements

This work was supported by Secretaría General de Ciencia y Técnica, Universidad Nacional del Nordeste (PI A001/14, PI A002/18) and Forestal Bosques del Plata S.A. (FBDP). E. Brugnoli, C. Luna, A. González, and P. Sansberro are members of the Research Council of Argentina (CONICET). G. Ayala received a scholarship from CONICET and FBDP.

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  1. Instituto de Botánica del Nordeste (IBONE-CONICET), Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Sargento Cabral 2131, W3402BKG, Corrientes, Argentina

    Paula G. Ayala, Elsa A. Brugnoli, Claudia V. Luna, Ana M. González & Pedro A. Sansberro

  2. Forestal Bosques del Plata S.A, Av. J.M. Fangio 3873, CP: 3300, Posadas, Misiones, Argentina

    Raúl Pezzutti

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  1. Paula G. Ayala
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  2. Elsa A. Brugnoli
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  3. Claudia V. Luna
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  4. Ana M. González
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  5. Raúl Pezzutti
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  6. Pedro A. Sansberro
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Correspondence to Pedro A. Sansberro.

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Communicated by Klimaszewska.

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Ayala, P.G., Brugnoli, E.A., Luna, C.V. et al. Eucalyptus nitens plant regeneration from seedling explants through direct adventitious shoot bud formation. Trees 33, 1667–1678 (2019). https://doi.org/10.1007/s00468-019-01888-5

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