Abstract
Genetic variation—primarily in 19 genetic loci of seven enzyme systems—was analyzed in accessions from various parts of the geographic range ofSolanum pennellii, which according to all tested biosystematic criteria behaves like a species ofLycopersicon. In comparison with the largely sympatricL. hirsutum andL. pimpinellifolium, this species exhibits the same trends of reduced allogamy and decreased genetic variation toward the north and south margins of its distribution, though to a much lesser degree; it does not exhibit their trends toward smaller flower size in the same peripheral regions. All three species agree to a considerable extent in the ranking of their tested loci in respect to degree of variablility; however, overall polymorphy is highest inS. pennellii. Except for the appearance of self-compatibility at its southernmost margin,S. pennellii is exclusively and rigidly self-incompatible. Alleles are distributed much more uniformly over the range than in the previously mentioned species, marginal and internal endemic mutants being much less abundant. A marked geographic disagreement is evident in regions of high and low variation. These differences in patterns of genetic variability are reconciled in terms of observed differences in mating systems, probable age of distributions, and adaptive strategies.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Correll, D. S., 1958: A new species and some nomenclatural changes inSolanum, sectionTuberarium. — Madroño14, 232–236.
—, 1961: New species and some nomenclatural changes in sectionTuberarium ofSolanum. — Wrightia2, 169–197.
—, 1962: The Potato and Its Wild Relatives. — Renner, Texas: Texas Research Foundation.
Gottlieb, L. D., 1973: Genetic differentiation, sympatric speciation, and the origin of a diploid species ofStephanomeria. — Amer. J. Bot.60, 545–554.
Hamrick, J. L., 1979: Genetic variation and longevity. — In: Topics in Plant Population Biology. — New York: Columbia Univ. Press.
Hardon, J. J., 1967: Unilateral incompatibility betweenSolanum pennellii andLycopersicon esculentum. — Genetics57, 795–808.
Khush, G., Rick, C. M., 1963: Meiosis in hybrids betweenLycopersicon esculentum ×Solanum pennellii. — Genetica33, 167–183.
Lewis, H., Raven, P. H., 1958: Rapid evolution inClarkia. — Evolution12, 319–336.
Lewontin, R. C., 1974: The Genetic Basis of Evolutionary Change. — New York: Columbia Univ. Press.
Moore, D. M., Lewis, H., 1965: The evolution of self-pollination inClarkia xantiana. — Evolution19, 104–114.
Rick, C. M., 1960: Hybridization betweenLycopersicon esculentum andSolanum pennellii: phylogenetic and cytogenetic significance. — Proc. Nat. Acad. Sci.46, 78–82.
—, 1969: Controlled introgression of chromosomes ofSolanum pennellii intoLycopersicon esculentum: segregation and recombination. — Genetics62, 753–768.
Rick, C. M., 1972: Further studies on segregation and recombination in backcross derivatives of a tomato species hybrid. — Biol. Zentralbl.91, 209–220.
—, 1973: Potential genetic resources in tomato species: clues from observations in native habitats. — InHollaender, A., &Srb, A., (Eds.): Genes, Enzymes, and Populations. — New York: Plenum.
—, 1979: Biosystematic studies inLycopersicon and closely related species ofSolanum. — InHawkes, J. G., & al.: The Biology and Taxonomy of theSolanaceae. — Linnean Society Symp. Ser. No.7. — London: Academic Press.
—, 1976: Peroxidase complex with concomitant anodal and cathodal variation in red-fruited tomato species. — Proc. Nat. Acad. Sci.73, 900–904.
—, —, 1977: Genetic variation inLycopersicon pimpinellifolium: evidence of evolutionary change in mating systems. — Pl. Syst. Evol.127, 139–170.
—, —, 1979a: Evolution of mating systems inLycopersicon hirsutum as deduced from genetic variation in electrophoretic and morphological characters. — Pl. Syst. Evol.132, 279–298.
—, 1978: Rates of cross-pollination inLycopersicon pimpinellifolium: impact of genetic variation in floral characters. — Pl. Syst. Evol.129, 31–44.
—, 1976: Genetic and biosystematic studies on two new sibling species ofLycopersicon from interandean Perú. — Theor. Appl. Genetics47, 55–68.
—, 1979b: A pseudoduplication inLycopersicon pimpinellifolium. — Proc. Nat. Acad. Sci.76, 3435–3439.
Stebbins, G. L., 1957: Self-fertilization and populational variability in the higher plants. — Amer. Nat.91, 337–354.
Stevens, W. L., 1942: Accuracy of mutation rates. — J. Genet.43, 301–307.
Tanksley, S. D., 1979: Linkage, chromosomal association, and expression ofAdh-1 andPgm-2 in tomato. — Biochem. Genet.17, 1159–1167.
—, 1980:Pgi-1, a single gene in tomato responsible for a variable number of isozymes. — Canad. J. Genet. Cytol.22, 271–278.
—, 1980a: Genetics of esterases in species ofLycopersicon. — Theor. Appl. Genetics56, 209–219.
—, —, 1980b: Isozymic gene linkage map of the tomato: applications in genetics and breeding. — Theor. Appl. Genetics57, 161–170.
Vasek, F. C., 1958: The relationship ofClarkia exilis toClarkia unguiculata. — Amer. J. Bot.45, 150–162.
—, 1964: The evolution ofClarkia unguiculata derivatives adapted to relatively xeric environments. — Evolution18, 26–42.
West, H. R., 1973: A chemotaxonomic study of the genusLycopersicon (Tourn.)Mill. — M. Sc. Thesis, Univ. Birmingham.
Yu, A. T. T., 1972: The genetics and physiology of water usage inSolanum pennellii Corr. and its hybrids withLycopersicon esculentum Mill. — Ph.D. Thesis, University of California, Davis.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rick, C.M., Tanksley, S.D. Genetic variation inSolanum pennellii: Comparisons with two other sympatric tomato species. Pl Syst Evol 139, 11–45 (1981). https://doi.org/10.1007/BF00983920
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00983920