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Asymmetric somatic hybridization between tall fescue (Festuca arundinacea Schreb.) and irradiated Italian ryegrass (Lolium multiflorum Lam.) protoplasts

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Abstract

Intergeneric asymmetric somatic hybrids have been obtained by the fusion of metabolically inactivated protoplasts from embryogenic suspension cultures ofFestuca arundinacea (recipient) and protoplasts from a non-morphogenic cell suspension ofLolium multiflorum (donor) irradiated with 10, 25, 50, 100, 250 and 500 Gy of X-rays. Regenerating calli led to the recovery of genotypically and phenotypically different asymmetric somatic hybridFestulolium plants. The genome composition of the asymmetric somatic hybrid clones was characterized by quantitative dot-blot hybridizations using dispersed repetitive DNA sequences specific to tall fescue and Italian ryegrass. Data from dot-blot hybridizations using two cloned Italian ryegrass-specific sequences as probes showed that irradiation favoured a unidirectional elimination of most or part of the donor chromosomes in asymmetric somatic hybrid clones obtained from fusion experiments using donor protoplasts irradiated at doses ≤ 250 Gy. Irradiation of cells of the donor parent with 500 Gy prior to protoplast fusion produced highly asymmetric nuclear hybrids with over 80% elimination of the donor genome as well as clones showing a complete loss of donor chromosomes. Further information on the degree of asymmetry in regenerated hybrid plants was obtained from chromosomal analysis including in situ hybridizations withL. multiflorum-specific repetitive sequences. A Southern blot hybridization analysis using one chloroplast and six mitochondrial-specific probes revealed preferentially recipient-type organelles in asymmetric somatic hybrid clones obtained from fusion experiments with donor protoplasts irradiated with doses higher than 100 Gy. It is concluded that the irradiation of donor cells before fusion at different doses can be used for producing both nuclear hybrids with limited donor DNA elimination or highly asymmetric nuclear hybrid plants in an intergeneric graminaceous combination. For a wide range of radiation doses tested (25–250Gy), the degree of the species-specific genome elimination from the irradiated partner seems not to be dose dependent. A bias towards recipient-type organelles was apparent when extensive donor nuclear genome elimination occurred.

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Abbreviations

cpDNA:

Chloroplast DNA

2, 4-D:

2,4-dichlorophenoxyacetic acid

FDA:

fluorescein diacetate

IOA:

iodoacetamide

mtDNA:

mitochondrial DNA

RFLP:

restriction fragment length polymorphism

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Author notes

  1. M. P. Vallés

    Present address: Dpto. of Genética y Producción Vegetal, Estación Experimental de Aula Dei, C.S.I.C., 50080, Zaragoza, Spain

Authors and Affiliations

  1. Institute for Plant Sciences, Swiss Federal Institute of Technology, CH-8092, Zürich, Switzerland

    G. Spangenberg, M. P. Vallés, Z. Y. Wang, P. Montavon, J. Nagel & I. Potrykus

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  1. G. Spangenberg
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  2. M. P. Vallés
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  3. Z. Y. Wang
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  4. P. Montavon
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  5. J. Nagel
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  6. I. Potrykus
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Communicated by M. Koorneef

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Spangenberg, G., Vallés, M.P., Wang, Z.Y. et al. Asymmetric somatic hybridization between tall fescue (Festuca arundinacea Schreb.) and irradiated Italian ryegrass (Lolium multiflorum Lam.) protoplasts. Theoret. Appl. Genetics 88, 509–519 (1994). https://doi.org/10.1007/BF01240911

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  • DOI: https://doi.org/10.1007/BF01240911

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