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Thomas J. Molnar, Megan Muehlbauer, Phillip A. Wadl, and John M. Capik

‘Rutpink’ is a new kousa dogwood ( Cornus kousa ) cultivar released from the woody ornamentals breeding program of the New Jersey Agricultural Experiment Station (NJAES) and Rutgers University and is marketed under the name Scarlet Fire ® dogwood

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Phillip A. Wadl, John A. Skinner, John R. Dunlap, Sandra M. Reed, Timothy A. Rinehart, Vincent R. Pantalone, and Robert N. Trigiano

florida L.) and kousa dogwood ( C. kousa Hance) are two species popular in the ornamental horticulture industry, although other species such as C. nuttallii Audubon ex Torr. & A. Gray, C. elliptica (Pojarkova) Q.Y. Xiang & Boufford { Xiang and

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Phillip A. Wadl, Xinwang Wang, Andrew N. Trigiano, John A. Skinner, Mark T. Windham, Robert N. Trigiano, Timothy A. Rinehart, Sandra M. Reed, and Vincent R. Pantalone

, 2005 ). Although the bracts of kousa dogwood are typically not as showy as those of flowering dogwood, kousa dogwood has other appealing attributes such as dark green foliage, bright red fall color, vivid red-colored aggregate fruit, and attractive form

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Margaret T. Mmbaga, and Roger J. Sauvé,

Cloud’ ( Mmbaga and Sauvé, 2004b ). However, most Japanese dogwood ( C. kousa ) cultivars and most Japanese interspecific hybrids (C. kousa × C. florida) are resistant ( Mmbaga and Sauvé, 2004b ). Current disease management practices for this disease

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Kimberly Shearer and Thomas G. Ranney

Dogwoods include more than 50 species of shrubs, small trees, and a few herbaceous perennials with distribution that ranges across the northern hemisphere and rarely into the southern hemisphere ( Eyde, 1988 ; Fan and Xiang, 2001 ; Reed, 2004

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R.N. Trigiano, M.H. Ament, M.T. Windham, and J.K. Moulton

We thank Willard Witte for the gifts of the Cornus kousa cultivars used in this study and the financial support of the Tennessee Agricultural Experiment Station and the USDA-ARS through award 58-6404-2-00057.

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Phillip A. Wadl, Mark T. Windham, Richard Evans, and Robert N. Trigiano

The genus Cornus contains 58 species of trees, shrubs, and herbs that are mostly distributed throughout the northern hemisphere ( Xiang et al., 2006 ). Flowering dogwood ( C. florida ), kousa dogwood ( C. kousa ), and their interspecific hybrids

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Amy N. Wright, Alex X. Niemiera, J. Roger Harris, and Robert D. Wright

The objective of this study was to determine the effects of lime and micronutrient amendments on growth of seedlings of nine container-grown landscape tree species in two pine bark substrates with different pHs. Acer palmatum Thunb. (Japanese maple), Acer saccharum Marsh. (sugar maple), Cercis canadensis L. (redbud), Cornus florida L. (flowering dogwood), Cornus kousa Hance. (kousa dogwood), Koelreuteria paniculata Laxm. (golden-rain tree), Magnolia ×soulangiana Soul.-Bod. `Lennei' (magnolia), Nyssa sylvatica Marsh. (blackgum), and Quercus palustris Müenchh. (pin oak) were grown from seed in two pine bark substrates with different pHs (pH 4.7 and 5.1) (Expt. 1). Preplant amendment treatments for each of two pine (Pinus taeda L.) bark sources were: with and without dolomitic limestone (3.6 kg·m–3) and with and without micronutrients (0.9 kg·m–3), and with and without micronutrients (0.9 kg·m–3), supplied as Micromax. Seedlings were harvested 12 and 19 weeks after seeds were planted, and shoot dry weight and tree height were determined. The same experiment was repeated using two of the nine species from Expt. 1 and pine bark substrates at pH 5.1 and 5.8 (Expt. 2). Seedling shoot dry weight and height were measured 11 weeks after planting. For both experiments, pine bark solutions were extracted using the pour-through method and analyzed for Ca, Mg, Fe, Mn, Cu, and Zn. Growth of all species in both experiments was greater in micronutrient-amended than in lime-amended bark. In general, adding micronutrients increased nutrient concentrations in the pine bark solution, while adding lime decreased them. Effect of bark type on growth in Expt. 1 was variable; however, in Expt. 2, growth was greater in the low pH bark than in the high pH bark. In general, nutrient concentrations in bark solutions were higher in low pH bark than in high pH bark for both experiments. Under the pH conditions of this experiment, micronutrient additions stimulated growth whereas a lime amendment did not.

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Xinwang Wang, Robert N. Trigiano, Mark T. Windham, Renae DeVries, Timothy A. Rinehart, James M. Spiers, and Brain Scheffler

The genus Cornus consists of many species, of which C. florida, C. kousa, C. mas, and C. stolonifera are four main ornamental species in North America, Asia, and Europe. For example, over 200 cultivars of C. florida alone have been developed for the nursery industry. Microsatellite loci, or SSR, are useful markers for studying genetic diversity and for creating linkage maps of the various species. The objective of this study was to investigate the genetic diversity between these four Cornus species and eight hybrids. Evaulation of the diversity will be useful in assessing the selection pressure of breeders and/or genetic drift of these dogwood cultivars/lines. Fifteen SSR primer pairs were selected to examine 56 Cornus cultivars and/or lines of the four species and hybrids. The study included 28 C. florida cultivars and lines, 15 C. kousa cultivars and lines, four C. stolonifera cultivars, one cultivar of C. mass and eight hybrids between various Cornus species. An exceptionally high level of diversity was detected among the 56 entries in both the number and size range of SSR alleles. A total of 95 alleles with an average of 7.8 alleles per loci were detected among these 56 genotypes. These selected Cornus cultivars and/or lines could be clustered into four to six subgroups. Some Cornus species were integrated into other species groups, suggesting gene flow between species via the breeding or evolution. SSR markers can contribute to the exploitation of genetic diversity for existing Cornus germplasm. For further study, examination of more SSR loci could explain more completely the diversity among these Cornus cultivars and lines.

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Phillip A. Wadl, Xinwang Wang, John K. Moulton, Stan C. Hokanson, John A. Skinner, Timothy A. Rinehart, Sandra M. Reed, Vincent R. Pantalone, and Robert N. Trigiano

Transfer success of C. florida and C. kousa dogwood simple sequence repeats across Cornaceae. SSRs are thought to occur less frequently in the genomes of plants than in genomes of other organisms ( Powell et al., 1996 ). When this is combined with the