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Is the cad-n1 Allele Associated with Increased Wood Density or Growth

A rare mutant allele (cad-n1) of the cad gene in loblolly pine (Pinus taeda L.) causes a deficiency in the production of cinnamyl alcohol dehydrogenase (CAD). Effects associated with this null allele were examined by comparing wood density and growth of 15-year-old cad-n1 heterozygotes with their wild-type full-siblings, established in three test series (1, 2 and 3) in two states (South Carolina and Georgia). In each series, cad-n1 heterozygous selections (A, B and/or C) were crossed with five unrelated wild-type parents, to produce five full-sib families. Series 1 included five crosses each for selections A and B, and series 2 had five crosses with selection C. Five additional crosses for selection A were established in series 3. Each series was established in replicated trials at two different field-test sites, and all tests included a common, unimproved commercial checklot. Test progenies from each cross and at each site were genotyped at the cad locus, and assessed for growth and wood density traits. In all, 839 trees were sampled.


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Author(s): Q. Yu, Bailian Li, C. Dana Nelson, Steven E. McKeand, T. J. "Tim" Mullin

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2005