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- W2442563080 abstract "A sample of 37 cottonwood clones from a selection program was compared with a sample of 40 random clones in a 14-year test at two sites near Stoneville, Mississippi. Throughout the test period, the select sample was slightly better in mean growth rate, but this difference decreased with age. Performance of blue tag clones selected at age 5 and planted commercially was good. But a group of clones selected at age 14 showed from two to three times as much improvement in diameter and height as the group selected at age 5. Eastern Cottonwood (Populus deltoides Bartr.) is an important, fast growing plantation hardwood in the South. Because of its widespread occurrence, high variability, large number of seeds per catkin, and ease of vegetation propagation, many more genotypes can be assembled than can be evaluated adequately. In most breeding programs many genotypes are eliminated after only minimal evaluation, and such rapid elimination can result in the loss of much useful variability. In the long run, expedient selection may prove more costly, as results from a 14-year clonal test near Stoneville, Mississippi, illustrate. MATERIALS AND METHODS We studied two populations of clones. Twenty-five female parent trees with good growth and form were selected in various stands along the Mississippi River from 50 miles north to 50 miles south of Greenville, Mississippi. This was followed by selection in the nursery from among 160 seedlings from openpollinated seed from each of these trees. One or two stages of one-year clonal tests were used to select the 37 most promising clones from these 4,000 seedlings. The other population was sampled by cloning 40 random trees from a total of six natural stands from 2 to 4 years old along the same segment of the river. The two samples represented the practical extremes of selection intensity that might be represented in preliminary cottonwood clonal test outplantings. The authors are Principal Plant Geneticist and Research Support Geneticist at the Southern Hardwoods Laboratory, which is maintained at Stoneville, Mississippi, by the Southern Forest Experiment Station, Forest Service-USDA, in cooperation with the Mississippi Agricultural and Forestry Experiment Station and Southern Hardwood Forest Research Group." @default.
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- W2442563080 date "1971-01-01" @default.
- W2442563080 modified "2023-09-24" @default.
- W2442563080 title "Avoid Early Selection for Growth Rate in Cottonwood" @default.
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