Abstract
Starch gel electrophoretic analyses of crude seed extracts of Cucurbita ecuadorensis, C. maxima, their F1 and F2, and three of the four possible interspecific backcrosses reveal that the genus is polymorphic for alpha-naphthyl acetate esterases (Est) and leucine aminopeptidase (LAP). The two electrophoretic forms of both Est and LAP are controlled by codominant alleles. The two loci do not exhibit linkage. Neither the LAP nor the Est phenotypes exhibit a significant deviation from the expected 1:1 ratio in interspecific backcrosses when the donor parent alleles are transmitted through female gametes, but there is a significant deviation for Est when transmission is through male gametes. Differential gametic selection involving the Est-1 locus suggests structural differences between the genomes of the parental species for the chromosomal region in which this locus occurs. No structural differences are indicated between the parental genomes for the chromosome region bearing the Lap-1 locus.
Similar content being viewed by others
References
Ashton, G. C., and Braden, A. W. H. (1961). Serum beta-globulin polymorphism in mice. Australian J. Biol. Sci. 14 248.
Bemis, W. P. (1959). Selective fertilization in lima beans. Genetics 44 555.
Boyer, S. H., Fainer, D. C., and Naughton, M. L. (1963). Myoglobin: Inherited structural variation in man. Science 140 1228.
Brown, A. H. D., and Allard, R. W. (1969). Inheritance of isozyme differences among the inbred parents of a reciprocal recurrent selection population of maize. Crop Sci. 9 72.
Cutler, H. C., and Whitaker, T. W. (1969). A new species of Cucurbita from Ecuador. Ann. Missouri Botan. Garden 55 392.
Hunziker, J. H. (1969). Molecular data in plant systematics. In Systematic Biology (Proc. Internat. Congr. Syst. Biol., Ann Arbor, Michigan, June 1967), Publ. 1692, Natl. Acad. Sci., Washington, D.C., p. 485.
Hurd, P. D., Jr., and Linsley, E. G. (1967). South American squash and gourd bees of the genus Peponapis (Hymenoptera: Apoidea). Ann. Entomol. Soc. Am. 60 647.
Hurd, P. D., Jr., and Linsley, E. G. (1970). A classification of the squash and gourd bees Peponapis and Xenoglossa (Hymenoptera: Apoidea). Univ. Calif. Publ. Entomol. 62 1.
Johnson, B. L., and Hall, O. (1965). Analysis of phylogenetic affinities in the Triticinae by protein electrophoresis. Am. J. Botany 52 506.
Poulik, M.D. (1957). Starch gel electrophoresis in a discontinuous system of buffers. Nature 180 1477.
Prakash, S., Lewontin, R. C., and Hubby, J. L. (1969). A molecular approach to the study of genic heterozygosity in natural populations. IV. Patterns of genic variation in central, marginal and isolated populations of Drosophila pseudoobscuara. Genetics 61 841.
Schwartz, H. M., Biedron, S. I., von Holdt, M. M., and Rehm, S. (1964). A study of some plant esterases. Phytochemistry 3 189.
Shows, T. B., Massaro, E. J., and Ruddle, F. H. (1969). Evolutionary evidence for a regulator gene controlling the lactate dehydrogenase B gene in rodent erythrocytes. Biochem. Genet. 3 525.
Stephens, S. G. (1949). The cytogenetics of speciation in Gossypium. I. Selective elimination of the donor parent genotype in interspecific backcrosses. Genetics 34 627.
Stephens, S. G. (1950). The internal mechanism of speciation in Gossypium. Botan. Rev. 16 115.
Wall, J. R. (1969). A partial survey of the genus Cucurbita for electrophoretic variants of esterase and leucine aminopeptidase. Southwestern Naturalist 14 141.
Wall, J. R., and Whitaker, T. W. (1968). Inheritance of leucine aminopeptidase and alpha-naphthyl acetate esterase polymorphism in an interspecific Cucurbita cross. Genetics 60 (No. 1, Part 2): 234 (abst.).
Whitaker, T. W., and Bemis, W. P. (1965). Evolution in the genus Cucurbita. Evolution 18 553.
Whitaker, T. W., and Cutler, H. C. (1965). Cucurbits and cultures in the Americas. Econ. Botany 19 344.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wall, J.R., Whitaker, T.W. Genetic control of leucine aminopeptidase and esterase isozymes in the interspecific cross Cucurbita ecuadorensis x C. maxima . Biochem Genet 5, 223–229 (1971). https://doi.org/10.1007/BF00485793
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00485793