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Yue Sun and Lowell C. Ewart

A dominant gene, R, is hypothesized to control the red underfoliage color inheritance in tetraploid fibrous-rooted Begonia × semperflorens-cultorum. This dominant gene R is considered to also affect the intensity of the foliage color, with RRRR and RRRr giving dark red color on the underside of the leaves. The combination of RRrr and Rrrr gives intermediate red coloration, and homozygous recessive rrrr gives all green foliage. A homozygous RRRR inbred line is being test-crossed for potential commercial value. Cytological investigations of hybrids and inbreds derived from species crosses are ongoing. The results will be presented.

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Mark H. Brand

Container production of recently-developed and popular Kalmia latifolia cultivars has not been fully optimized. A study was conducted using six cultivars grown in full sun, 40% shade or 60% shade. Under 60% shade, plant height was reduced slightly, but shading, at either 40% or 60%, had no significant effect on all other measured growth parameters. Plants were too young to set significant numbers of flower buds, so the study will be continued a second year to quantify the effects of shade on flower bud set. Foliage color was measured using a Minolta CR-200 Chroma Meter. As shading increased, hue angle increased and the chroma and value of the color decreased, indicating that shading produced greener (less yellow), darker and duller foliage colors. Foliar chlorophyll content increased with increasing shading. Higher foliar chlorophyll content correlates with greener leaves in shaded treatments and is likely contributing to the green color. Using moderate levels of shade over container-grown Kalmia could allow growers to produce greener, more marketable plants without sacrificing plant growth.

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Maria Papafotiou, Barbara Avajianneli, Costas Michos and Iordanis Chatzipavlidis

foliage color, as plants in media with CGC had more areas colored red in their leaves. The increase of red coloration was proportional to the increase of CGC in the medium ( Fig. 1 ). The phenomenon was more intense in the lower leaves than the apical ones

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Katherine F. Garland, Stephanie E. Burnett, Lois B. Stack and Donglin Zhang

−1 compared with those grown under 5.3 mol·m −2 ·d −1 ( Nemali and van Iersel, 2004 ; Pramuk and Runkle, 2005 ). Fausey et al. (2005) reported that higher DLI resulted in improved visual quality (height, flower color, lateral branching, foliage

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John M. Ruter and Jeff L. Sibley

In 1991, a cooperative project with the U.S. National Arboretum in Washington, D.C., was initiated in Tifton, Ga. (USDA hardiness zone 8a) to evaluate red maples (Acer rubrum L.) potentially suitable for the coastal plain region of the southeastern U.S. Greatest annual height growth across all cultivars over 6 years was for `Alapaha', a seedling selection from southern Georgia with annual height growth of 35 inches (88.0 cm), and several seedling selections from northern Florida with annual height increases in excess of 33 inches (86.0 cm). Selections showing the least average annual height growth were NA-56024 and NA-57772 (`Red Rocket'). For commercially available cultivars, the most dependable for fall color in Tifton was `October Glory'®. In addition, two new selections from the National Arboretum have also shown excellent fall color—`Somerset' and `Brandywine'.

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Abby K. van den Berg and Timothy D. Perkins

A field-portable tool for nondestructive foliar anthocyanin content estimation would be beneficial to researchers in many areas of plant science. An existing commercial chlorophyll content meter was modified to measure an index of anthocyanin content. The ability of the experimental anthocyanin meter (ACM) to estimate total extractable anthocyanin content was tested in sugar maple (Acer saccharum Marsh.) leaves representing several subjective color categories collected from a variety of field sites in northwestern Vermont on several dates in Autumn 2003. Overall, there was a significant linear relationship between anthocyanin content index (ACI) and total extractable anthocyanin content (r2 = 0.872, P < 0.001). Therefore, the ACM appears to be an effective tool for estimation of relative anthocyanin content in large samples of autumn sugar maple leaves.

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W. Garrett Owen and Roberto G. Lopez

In floriculture crops, aesthetic qualities, including flower and foliage color or variegation, influence consumers’ initial perceptions and thus, purchasing decisions. For instance, Berghage and Wolnick (2000) surveyed and reported that consumers

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Ryan N. Contreras, Ron Determann and Mara Friddle

). Winter browning is highly variable among ornamental cultivars of japanese-cedar. Rouse et al. (2000) described 45 cultivars of japanese-cedar growing in the eastern United States including variability in foliage color during winter from brown to dark

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Mary H. Meyer, Pamela J. Bennett, Barbara Fair, James E. Klett, Kimberly Moore, H. Brent Pemberton, Leonard Perry, Jane Rozum, Alan Shay and Matthew D. Taylor

definitions provided ( Meyer, 2017 )], flowering time, fall color, pest damage, foliage color (measured in midsummer) as determined by Royal Horticultural Society’s color chart ( RHS, 2007 ), plant form (recorded at plant maturity each year), flowering date