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Summary

Intergeneric symmetric and asymmetric somatic hybrids have been obtained by fusion of metabolically inactivated protoplasts from embryogenic suspension cultures of tall fescue (Festuca arundinacea Schreb.) and unirradiated or 10-500 Gy-irradiated protoplasts from non-morphogenic cell suspensions of Italian ryegrass (Lolium multiflorum Lam.). Genotypically and phenotypically different somatic hybrid Festulolium mature flowering plants were regenerated.

Species-specific sequences from F. arundinacea and L. multiflorum being dispersed and evenly-represented in the corresponding genomes were isolated and used for the molecular characterization of the nuclear make-up of the intergeneric, somatic Festulolium plants recovered. The irradiation of Italian ryegrass protoplasts with ≤ 250 Gy X-rays prior to fusogenic treatment favoured the unidirectional elimination of most or part of the donor chromosomes. Irradiation of L. multiflorum protoplasts with 500 Gy produced highly asymmetric (over 80% donor genome elimination) nuclear hybrids and clones showing a complete loss of donor chromosomes.

The RFLP analysis of the organellar composition in symmetric and asymmetric tall fescue (+) Italian ryegrass regenerants confirmed their somatic hybrid character and revealed a bias towards recipient-type organelles when extensive donor nuclear genome elimination had occurred.

Approaches aimed at improving persistence of ryegrasses based on asymmetric somatic hybridization with largely sexually-incompatible grass species (F. rubra and Alopecurus pratensis), and at transferring the cytoplasmic male sterility trait by intra- and inter-specific hybridization in L. multiflorum and L. perenne, have been undertaken.

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Abbreviations

cpDNA:

chloroplast DNA

CMS:

cytoplasmic male sterility

2,4-D:

2,4-dichlorophenoxy-acetic acid

IOA:

iodoacetamide

mtDNA:

mitochondrial DNA

RFLP:

restriction fragment length polymorphism

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Spangenberg, G. et al. (1995). Intergeneric symmetric and asymmetric somatic hybridization in Festuca and Lolium . In: Cassells, A.C., Jones, P.W. (eds) The Methodology of Plant Genetic Manipulation: Criteria for Decision Making. Developments in Plant Breeding, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0357-2_28

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  • DOI: https://doi.org/10.1007/978-94-011-0357-2_28

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