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Genotype effects on proliferative embryogenesis and plant regeneration of soybean

  • Developmental Biology/Morphogenesis
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Summary

Proliferative somatic embryogenesis is a regeneration system suitable for mass propagation and genetic transformation of soybean [Glycine max (L.) Merr.]. The objective of this study was to examine genotypic effects on induction and maintenance of proliferative embryogenic cultures, and on yield, germination, and conversion of mature somatic embryos. Somatic embryos were induced from eight genotypes by explanting 100 immature cotyledons per genotype on induction medium. Differences in frequency of induction were observed among genotypes. However, this step was not limiting for plant regeneration because induction frequency in the least responding genotype was sufficient to initiate and maintain proliferative embryogenic cultures. Six genotypes selected for further study were used to initiate embryogenic cultures in liquid medium. Cultures were evaluated for propagation of globular-stage tissue in liquid medium, yield of cotyledon-stage somatic embryos on differentiation medium, and plant recovery of cotyledon-stage embryos. Genotypes also differed for weight and volume increase of embryogenic tissue in liquid cultures, for yield of cotyledon-stage embryos on differentiation medium, and for plant recovery from cotyledon-stage embryos. Rigorous selection for a proliferative culture phenotype consisting of nodular, compact, green spheres increased embryo yield over that of unselected cultures, but did not affect the relative ranking of genotypes. In summary, the genotypes used in this study differed at each stage of plant regeneration from proliferative embryogenic cultures, but genotypic effects were partially overcome by protocol modifications.

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Bailey, M.A., Boerma, H.R. & Parrott, W.A. Genotype effects on proliferative embryogenesis and plant regeneration of soybean. In Vitro Cell Dev Biol - Plant 29, 102–108 (1993). https://doi.org/10.1007/BF02632279

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  • DOI: https://doi.org/10.1007/BF02632279

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