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Donor chromosome elimination and organelle composition of asymmetric somatic hybrid plants between an interspecific tomato hybrid and eggplant

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Abstract

Morphology, the extent of elimination of donor chromosomes and the organelle composition of highly asymmetric somatic hybrid plants between a interspecific tomato hybrid Lycopersicon esculentum x L. pennellii (EP) as donor and a Solarium melongena, eggplant (E), recipient, were studied. Morphologically, the somatic hybrids most resemble eggplant but, due to polyploidy, growth is slower relative to both fusion parents. The somatic hybrids produce flowers that are characterized by abnormal styles, stigmas and by anthers which do not produce pollen. Limited amounts of donor EP genomic DNA were found in the three somatic hybrid plants (H18-1, H18-2 and H18-3), by dot-blot hybridization with probe pTHG2, equivalent to 6.23,5.41, and 5.95% EP, respectively. These percentages translated to the presence of 3.59, 2.90 and 3.19 average-size EP chromosomes in plants H1 8-1,-2 and-3, respectively. RFLP determination of L. esculentum- and L. pennellii-specific chromosomes revealed that only fragments of eight to ten out of the 24 EP chromosomes (EP has 12 L. esculentum and 12 L. pennellii chromosomes) are present in the asymmetric somatic hybrid plants. Loci of L. esculentum and L. pennellii were evenly represented in plants H18-1, -2, and -3: four to five from L. esculentum and four to five from L. pennellii. All somatic hybrid plants retained locus TG22, chromosome 4, from both EP species. Although the regeneration of plants, H18-1, -2 and-3 was from one callus, loci TG31 and TG79 of L. esculentum chromosome 2 and L. pennellii chromosome 9, respectively, were missing in hybrid plant H18-1. The three somatic hybrid plants all had chloroplast DNA fragments specific for S. melongena. The mitochondrial genome (mtDNA) in the asymmetric somatic hybrids showed predominantly the pattern of eggplant; however, some eggplant-specific polymorphic bands were not present in the three plants.

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Communicated by P. Maliga

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Samoylov, V.M., Izhar, S. & Sink, K.C. Donor chromosome elimination and organelle composition of asymmetric somatic hybrid plants between an interspecific tomato hybrid and eggplant. Theoret. Appl. Genetics 93, 268–274 (1996). https://doi.org/10.1007/BF00225756

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Key words

  • Eggplant
  • Tomato
  • Asymmetric somatic hybrids
  • Dot-blot hybridization
  • RFLP