Abstract
Somatic embryogenesis is a valuable tool for plant breeding. In recent years, different aspects related to somatic embryogenesis (SE) induction in tamarillo have been studied at our laboratory. In this work, results concerning the establishment of a protocol for cloning an adult tamarillo tree through SE are presented. Attempts to induce SE in tamarillo from various explants directly taken from an adult tree were unsuccessful and only calli with no embryogenic potential were initiated. To overcome the lack of potential of adult tissues for SE, an indirect approach was attempted in which shoots from an adult tree were first established in vitro and then wounded leaves were used for SE induction. A low rate of embryogenic tissue formation was obtained (19.4%), but it was in the range of initiation rates from leaf explants of in vitro cloned plantlets of different tamarillo cultivars (red, orange and yellow) that originated from a single seedling (13.3–54.4%). High variation in SE initiation among juvenile controls could not be explained by different organogenetic potential, as no significant differences in shoot proliferation or rooting ability during micropropagation could be detected. Subcultures of embryogenic lines from the adult tree allowed us to obtain a large amount of embryogenic tissue that, after 8 weeks on a PGR-free medium, gave an average of 111 plants per gram of fresh mass of embryogenic tissue. A RAPD comparative analysis of somatic embryo-derived plantlets and the donor tree confirmed that the plantlets had no variation in the DNA regions amplified by 12 primers. These results open the way for large-scale cloning of elite tamarillo trees through SE.
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Acknowledgments
This study was supported by CEF/POCI2010/FEDER and the Ph.D. fellowship was awarded to Sandra I. Correia (SFRH/BD/30633/2006) by the Portuguese Foundation for Science and Technology (FCT). We gratefully acknowledge the help of Prof. António Coutinho and Dr. José Dias with the SEM observations.
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Communicated by K. Klimaszewska.
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Correia, S., Lopes, M.L. & Canhoto, J.M. Somatic embryogenesis induction system for cloning an adult Cyphomandra betacea (Cav.) Sendt. (tamarillo). Trees 25, 1009–1020 (2011). https://doi.org/10.1007/s00468-011-0575-5
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DOI: https://doi.org/10.1007/s00468-011-0575-5