Karyotypes in the Genus Pseudotsuga
Previous investigators have shown that P. menziesii has a haploid chromosome number of 13, and both P. macrocarpa and P. wilsoniana have haploid numbers of 12. This study shows that each of the other three species, P. japonica, P. sinensis, and P. forrestii, has 12 haploid chromosomes, indicating that the basic number of chromosomes in the genus Pseudotsuga is 12. This adds to the evidence that P. menziesii with an n-number of 13 arose from a species with 12. Intraspecific hybridization would be a more fruitful approach to a breeding program for P. menziesii than would interspecific crossing. Forest Sci. 18:66-69.
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Document Type: Journal Article
Affiliations: Forest Geneticist, School of Forestry, Oregon State University, Corvallis 97331
Publication date: 1972-03-01
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