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Regeneration of plants from Fraxinus americana hypocotyls and cotyledons

  • Micropropagation
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Abstract

A plant regeneration protocol was developed for white ash (Fraxinus americana L.). Hypocotyls and cotyledons excised from embryos were cultured on Murashige and Skoog (MS) medium supplemented with 6-benzylaminopurine (BA) plus thidiazuron (TDZ), and compared for organogenic potential. Sixty-six percent of hypocotyl segments and 10.4% of cotyledon segments produced adventitious shoots, with a mean number of adventitious shoots per explant of 3.5 ± 0.9 and 2.5 ± 1.5, respectively. The best regeneration medium (52% shoot formation; 47% shoot elongation) for hypocotyls was MS basal medium containing 22.2 μM BA plus 0.5 μM TDZ, producing a mean of 3.9 ± 0.4 adventitious shoots. Adventitious shoots were established as proliferating shoot cultures following transfer to MS medium with Gamborg B5 vitamins supplemented with 10 μM BA plus 10 μM TDZ. For in vitro rooting, woody plant medium with indole-3-acetic acid (IAA) at 0, 2.9, 5.7, or 8.6 μM in combination with 4.9 μM indole-3-butyric acid (IBA) was tested for a 5- or 10-d dark culture period, followed by culture under a 16-h photoperiod. The best rooting (78% to 81%) of in vitro shoots was obtained with a 5 d dark culture treatment on medium containing 2.9 or 5.7 μM IAA plus 4.9 μM IBA, with an average of 2.6 ± 0.4 roots per shoot. Rooted plants were successfully acclimatized to the greenhouse. This adventitious shoot regeneration and rooting protocol will be used as the basis for experimental studies to produce transgenic white ash with resistance to the emerald ash borer.

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Acknowledgments

The authors gratefully acknowledge Drs. Michael Kane and John E. Preece for their constructive review and suggestions for the improvement of this manuscript.

The mention of a trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products or vendors that also may be suitable.

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Authors and Affiliations

  1. Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center (HTIRC), Purdue University, 715 West State Street, West Lafayette, IN, USA, 47907

    Kaitlin J. Palla

  2. USDA Forest Service, Northern Research Station, HTIRC, 715 West State Street, West Lafayette, IN, USA, 47907

    Paula M. Pijut

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  1. Kaitlin J. Palla
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  2. Paula M. Pijut
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Correspondence to Paula M. Pijut.

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Editor: N. J. Taylor

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Palla, K.J., Pijut, P.M. Regeneration of plants from Fraxinus americana hypocotyls and cotyledons. In Vitro Cell.Dev.Biol.-Plant 47, 250–256 (2011). https://doi.org/10.1007/s11627-011-9360-9

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  • DOI: https://doi.org/10.1007/s11627-011-9360-9

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