Abstract
Four cytological races of Scilla autumnalis, Liliaceae, were found in a study of 31 populations from Spain and Portugal. Two are diploids with 2n = 14, designated AA and B7B7, which differ by 70 per cent in DNA content, one is an allotetraploid AAB7B7 and one an autotetraploid of the B7 genome. Races AA and AAB7B7 are Iberian endemics, B7B7 is widespread throughout the Mediterranean, while the autotetraploid is the common European race. In Iberia, the races are parapatric and distribution is not related to climatic conditions. The populations are chromosomally heterogeneous. Polymorphisms include B-chromosomes (five types) and supernumerary segments. Large euchromatic segments occur on the homoeologues Al and Bl in both diploids and the allotetraploid, converting these acrocentrics to metacentrics. A wide spectrum of non-polymorphic numerical and structural variants was also found. The chromosomal structure of this species complex is discussed.
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Ainsworth, C C. 1981. The population cytology of Scilla autumnalis. PhD Thesis, University of London.
Ainsworth, C C, Parker, J S, and Horton, D M. 1983. Chromosome variation and evolution in Scilla autumnalis. Kew Chrom Conf, II, 261–268.
Barros Nevos, E. 1973. Contribution a la connaisance cytotaxononomique des Spermatophyta du Portugal. Bol Soc Brot Ser 2, 47, 157–212.
Barton, N H, and Hewitt, G M. 1985. Analysis of hybrid zones. Ann Rev Ecol Syst, 16, 113–148.
Battaglia, E. 1957. Scilla autumnalis L. Biotipi 2n. An, 6n e loro distribuzione geografica. Caryologia, 10, 75–95.
Battaglia, E. 1963. Una mutazione con B-chromosomi, 2n=14+3B, in Scilla autumnalis L. (Liliaceae). Caryologia, 16, 609–618.
Battaglia, E. 1964. Un secondo casa de B-chromosomi (2n=14+6−8B) in Scilla autumnalis L. (Liliaceae) proveniente della Palestina. Caryologia, 17, 65–76.
Bougourd, S M, and Parker, J S. 1979. The B-chromosome system of Allium schoenoprasum II. Stability, inheritance and phenotypic effects. Chromosoma, 75, 369–383.
Van Dijk, P S, and Van Delden, W. 1990. Evidence for autotetraploidy in Plantago media and comparisons between natural and artificial cytotypes concerning cell size and fertility. Heredity, 65, 349–358.
Gosálvez, J, Bella, J L, and Hewitt, G M. 1988. Chromosomal differentiation in Podisma pedestris: a third race. Heredity, 61, 149–157.
Guillén, A, and Ruiz Rejón, M. 1984. Structural variability and chromosome numbers variation in natural populations of Scilla autumnalis (Liliaceae). Pl Syst Evol, 144, 201–207.
Hong, D-Y. 1982. Cytotype variation and polyploidy in Scilla autumnalis L. Hereditas, 97, 227–235.
Jenkins, G, White, J, and Parker, J S. 1988. Elimination of multivalents during meiotic prophase in Scilla autumnalis II. Tetraploid. Genome, 30, 940–946.
John, B, and Miklos, G L G. 1979. Functional aspects of heterochromatin and satellite DNA. Int Rev Cytol, 40, 1–100.
Jones, R N, and Rees, H. 1982. B-Chromosomes. Academic Press, New York.
Matthews, R B, and Jones, R N. 1982. Dynamics of the B-chromosome polymorphism in rye I. Simulated populations. Heredity, 48, 347–371.
Oliver, J L, Posse, F, Martinez-Zapater, J M, Enriquez, A M, and Ruiz Rejón, M. 1982. B-chromosome and El isozyme activity in mosaic bulbs of Scilla autumnalis. Chromosoma, 85, 399–403.
Parker, J S, Wilby, A S, and Taylor, S. 1988. Chromosome stability and instability in plants. Kew Chrom Conf, III, 131–140.
Ruiz Rejón, M, and Oliver, J L. 1981. Genetic variability in Muscari comosum (Liliaceae) 1. A comparative analysis of chromosome polymorphisms in Spanish and Aegean populations. Heredity, 47, 403–407.
Ruiz rejón, M, Posse, F, and Oliver, J L. 1980. The B-chromosome system of Scilla autumnalis (Liliaceae): effects at the isozyme level. Chromosoma, 79, 341–348.
Valdes, B. 1970. Numeros cromosomicos des algunas plantas espanolas. Bol Real Soc Espan Hist Nat (Biol), 68, 193–197.
Valdes, B, Pastor, J, and Ubrera, J. 1978. En Numeros cromosomicos para la Flora Espanola, 1–14. Lagascalia, 7, 192–199.
Vosa, C G. 1973. Heterochromatin recognition and analysis of chromosome variation in Scilla siberica. Chromosoma, 43, 269–278.
Westerman, M. 1970. Parallel polymorphism for supernumerary segments in Chorthippus parallelus v. A new polymorphism in Europe. Heredity, 25, 662–667.
White, J, Jenkins, G, and Parker, J S. 1988. Elimination of multivalents during meiotic prophase in Scilla autumnalis I. Diploid and triploid. Genome, 30, 930–939.
Wilby, A S, and Parker, J S. 1988. The supernumerary segment systems of Rumex acetosa. Heredity, 60, 109–117.
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Parker, J., Lozano, R., Taylor, S. et al. Chromosomal structure of populations of Scilla autumnalis in the Iberian Peninsula. Heredity 67, 287–297 (1991). https://doi.org/10.1038/hdy.1991.92
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