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Theor Appl Genet. 1999 Aug;99(3-4):705-10. doi: 10.1007/s001220051287.

Average effect of a mutation in lignin biosynthesis in loblolly pine.

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  • 1Forest Biotechnology Group and Department of Forestry, North Carolina State University, NC 27695, Raleigh, USA, US, rwu@unity.ncsu.edu.

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.

PMID:
22665208
DOI:
10.1007/s001220051287
[PubMed]
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