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Proliferation and maintenance of embryogenic capacity in elm embryogenic cultures

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Summary

This paper investigates maintenance and proliferation of somatic embryogenesis systems for Ulmus minor and U. glabra. Proliferation occurred with subculture of embryogenic calluses. The calluses were mainly formed by friable nodules composed of meristematic cells organized into proembryogenic cell masses (PEMs) and thin-walled vacuolated parenchymatic cells. Cotyledonary embryos, with procambial strands and differentiation of their vascular tissues as well as visible root meristems, were identifiable after 18d of culture on a proliferation medium with 0.44 μM benzyladenine (BA). The shoot meristem was only occasionally well developed. Somatic embryo multiplication from elm embryogenic calluses is a clearly asynchronic system, and PEMs as well as embryos at all stages of development are observed simultaneously at the end of subculture period. Factors affecting the proliferation of elm embryogenic callus, such as culture medium, carbon source and genotype, were studied. Basal medium (MS) or medium supplemented with 0.44 μM BA produced the highest number of somatic embryos. Somatic embryo production was higher with sucrose or glucose than with maltose, and significant differences were also found among the four embryogenic lines tested. The use of liquid medium with filter paper support is an essential step for the survival of isolated somatic embryos during the germination stage. The addition of 0.22 μM BA′ to liquid MS medium was the best treatment for germination and plantlet conversion of elm somatic embryos.

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  1. Instituto de Investigaciones Agrobiológicas de Galicia, CSIC, Apartado 122, 15080, Santiago de Compostela, Spain

    E. Corredoira, A. M. Vieitez & A. Ballester

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  1. E. Corredoira
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  2. A. M. Vieitez
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  3. A. Ballester
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Correspondence to A. Ballester.

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Corredoira, E., Vieitez, A.M. & Ballester, A. Proliferation and maintenance of embryogenic capacity in elm embryogenic cultures. In Vitro Cell.Dev.Biol.-Plant 39, 394–401 (2003). https://doi.org/10.1079/IVP2003428

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  • DOI: https://doi.org/10.1079/IVP2003428

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