Scale-up of somatic embryogenesis in alfalfa (Medicago sativa L.) I subculture and indirect secondary somatic embryogenisis View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-05

AUTHORS

Fang-Ming Lai, Bryan D. McKersie

ABSTRACT

Three methods of increasing the productivity of somatic embryogenesis in Medicago sativa L. were investigated. In the basic procedure, somatic embryos were initiated from young petioles and carried through several phases: callus formation, suspension culture, selection of the embryogenic fraction by sieving, development, maturation, desiccation and storage. The suspensions were normally separated into three fractions by sieving. Fraction I (<200 μm) containing nonembryogenic cells or cell clusters was discarded. Fraction II (200–500 μm) consisting of embryogenic cell clusters was collected for embryo development and maturation. Fraction III (over 500 μM) containing the mixture of petiole residues with large pieces of calli and globular somatic embryos was usually discarded. Several methods to scale-up the suspension phase were unsuccessful. Direct subculture of the entire suspension by the addition of fresh liquid medium resulted in the loss of embryogenic capacity by the third subculture. Subculture of fraction II decreased embryogenic cell mass, and hence reduced total productivity. The recycling of fraction III back to fresh B5g liquid medium resulted in high productivity in the first culture but further subculture of this fraction resulted in a rapid decline in the embryogenic capacity. As an alternative, somatic embryos from the first tissue culture cycle were also used as explants for the initiation of secondary embryogenic callus. The embryogenic capacity of these somatic embryo explants declined rapidly as they matured. More than 100 secondary somatic embryos could be induced from embryo explants removed from development medium at 10 days after sieving the suspension, but only 40 somatic embryos were produced from each mature somatic embryo explant, and 13 from desiccated embryos. The secondary somatic embryos were comparable to the primary embryos in quality according to germination tests. The implications of the results to the efficiency of somatic embryo production of Medicago are discussed. More... »

PAGES

151-158

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00043609

DOI

http://dx.doi.org/10.1007/bf00043609

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006126825


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126 schema:name Department Crop Science, University of Guelph, N1G 2W1, Guelph, Ontario, Canada
127 rdf:type schema:Organization
 




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