Abstract
A complete method to regenerate adventitious shoots and to produce field-ready trees from three commercial cultivars of sweet cherry (Prunus avium L.) is described. The effects of explant types, pre-treatments, basal media, and phloroglucinol on cultivars Bing, Sweetheart, and Lapins were investigated. Callus developed on four explant types: apical shoot tips isolated from orchard trees; and punctured shoot tips, stem sections, and shoot bases of in vitro shoot cultures. Callus formed on Bing (5%), Sweetheart (8%), and Lapins (20%) shoot tips from orchard trees after 4 months on Murashige and Skoog medium (MS) at half-strength with 3 μM benzylaminopurine (BA). In vitro-derived explants formed callus after 3 months on Woody Plant Medium with 3 μM BA (W3B): punctured shoot tips (Sweetheart and Lapins 67%), stem sections (Sweetheart 31%, Lapins 27%), and shoot bases (Sweetheart 10%, Lapins 17%). Pre-treatment of shoot cultures on MS with 3 μM BA and 1 mM phloroglucinol increased callus formation three-fold on shoot base explants. Callus was separated from parental explants and maintained on MS with 3 μM BA. Shooting was induced by transferring callus to W3B. At 2 weeks, shoot development approached 100%. By 4 weeks, 7–17 shoots had formed on each explant. Callus was maintained for 1.5 years with no decrease in shoot production. Shoots were grafted onto Mazzard (P. avium) rootstocks with 54% (Sweetheart), 57% (Lapins), and 21% (Bing) success after 5 weeks.
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Abbreviations
- BA:
-
6-benzylaminopurine
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- IBA:
-
Indole-3-butyric acid
- MS:
-
Murashige and Skoog medium
- NAA:
-
α-naphthaleneacetic acid
- WPM:
-
Woody Plant Medium
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Acknowledgements
This project was funded by the Industrial Research Assistance Program and was carried out in collaboration with Agriculture and Agri-Food Canada. Certified virus-free shoots were donated by the Okanagan Plant Improvement Company. We thank S. Wahlgren for valuable advice, M. Weiss for photography, and E. Randall and D. Weir.
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Feeney, M., Bhagwat, B., Mitchell, J.S. et al. Shoot regeneration from organogenic callus of sweet cherry (Prunus avium L.). Plant Cell Tiss Organ Cult 90, 201–214 (2007). https://doi.org/10.1007/s11240-007-9252-1
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DOI: https://doi.org/10.1007/s11240-007-9252-1