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The Journal of Heredity 1989:80(5):404-407
© 1989 The American Genetic Association 80:404-407

other

Genetic Control of Seed Chemistry and Morphology in Wild Parsnip (Pastinaca sativa)

A. R. Zangeri, M. R. Berenbaum, and E. Levine

Department of Entomology, University of Illinois Urbana
Illinois Natural History Survey Champaign

Address reprint requests to Dr. Zangeri, Department of Entomology, 320 Morrill Hall, University of Illinois, 505 S. Goodwin, Urbana, IL 61801

Abstract

Wild parsnip seed contain furanocoumanns, secondary compounds that are toxic to a wide variety of organisms. Variation in the quantities of furanocoumarins in seed has been shown to be genetically based. Because these compounds are found exclusively within oil tubes in the fruit, we attempted to determine whether seed morphology, including the number and size of oil tubes, is genetically variable and serves as a constraint on chemical content. Quantitative genetic analyses revealed significant additive genetic variation for three of five chemicals, seed length, and the number and area of oil tubes. The content of all five furanocoumarins was most highly correlated with the combined area of the oil tubes; however, seed morphology overall accounted only for a small amount of the variation in chemical content. Nevertheless, a significant positive family mean correlation between oil tube area and one of the furanocoumarins (sphondin) suggested that the same genes control oil tube size and sphondin content.


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