Average effect of a mutation in lignin biosynthesis in loblolly pine

Rongling Wu, D. L. Remington, J. J. MacKay, S. E. McKeand, D. M. O'Malley

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Abstract

Cinnamyl alcohol dehydrogenase (CAD, E.C. 1.1.1.195) is a monolignol biosynthetic enzyme that catalyzes the final step of lignin subunit biosynthesis in higher plants. Recently, a mutant allele of the cad gene, cad-n1, encoding for the CAD enzyme, was discovered in loblolly pine. By reducing the expression of the cad gene, this mutant has a decreased lignin content and major changes in the lignin composition in wood. In this study, we found that the substitution of a wild-type allele by cad-n1 was associated with a significant effect on 2nd-year shoot elongation in a half-sib family of loblolly pine (designated family 7-1037). The average effect of cad-n1 appeared to increase with tree growth and was greater for stem radial growth than height growth. An increase of 14.1% in de-barked volume in year 4 was associated with cad-n1. Co-segregation analysis indicated that the cad locus itself might represent a gene that governs stem growth in pine. The significance of the mutation cad-n1 for tree growth and wood processing is discussed.

Original languageEnglish (US)
Pages (from-to)705-710
Number of pages6
JournalTheoretical and Applied Genetics
Volume99
Issue number3-4
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

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    Wu, R., Remington, D. L., MacKay, J. J., McKeand, S. E., & O'Malley, D. M. (1999). Average effect of a mutation in lignin biosynthesis in loblolly pine. Theoretical and Applied Genetics, 99(3-4), 705-710. https://doi.org/10.1007/s001220051287