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The Journal of Heredity 1986:77(5):368-370
© 1986 The American Genetic Association 77:368-370

other

Heritabilities of traits determining resin yield in gumweed

Steven P. McLaughlin

The author is research associate with the Office of Arid Lands Studies, University of Arizona, 845 N. Park Ave., Tucson, AZ 85719. He wishes to acknowledge thanks to Barbara Furer, Jim Linker, and Ellen Barker for their diligent work in the field and laboratory on this study. This work was supported by a grant from Hercules, Inc.

Abstract

Gumweed is a perennial herb producing a diterpene resin acid mixture that is a potential substitute for pine rosin in the naval stores industry. Heritabilities for phenological events, dry matter yields, and resin yields were determined by analysis of 40 half-sib (open-pollinated) families. All traits examined had highly significant heritabilities. Although percent resin yields were inversely correlated with plant dry weights, a covariance analysis showed that the genetic variances for percent resin yield and dry weight were independent. Selection for improved resin production through greater earliness, higher dry matter yields, and increased resin contents should be effective.


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