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John M. Ruter

Membrane thermostability of `Needlepoint' Chinese holly (Ilex cornuta Lindl. & Paxt.), `Albo-marginata' English holly (Ilex aquifolium L.), and `Nellie R. Stevens', an Ilex aquifolium × Ilex cornuta hybrid, was determined by measuring electrolyte leakage in excised leaves and roots. The critical midpoint heat-killing temperature (T,) after a 30-min exposure was 54.4 ± 0.4C for `Nellie R. Stevens' leaves and was ≈ lC higher than that for Chinese (52.9 ± 0.3C) or English holly (52.9 ± 0.4C). The Tm for English holly roots (53.9 ±_ 1.5C) was higher than that for either `Nellie R. Stevens' (51.7 ± 0.3C) or Chinese holly (50.1 ± 0.3C). The results of this study suggest that English holly and `Nellie R. Stevens' leaves and roots can withstand direct heat injury equal to or greater than that of Chinese holly.

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Daryl C. Joyce, Michael S. Reid and Richard Y. Evans

Low concentrations of ethylene induced abscission of leaves and berries from cut branchlets of English holly (Ilex aquifolium L.) and American mistletoe [Phoradendron tomentosum (DC.) Engelm. ex Gray ssp. macrophyllum (Engelm.) Wiens]. Application of 1 μmol of Ag+ per branchlet (as the anionic silver thiosulfate complex, STS) via the transpiration stream was found to retard this abscission. A higher application rate (4 μmol Ag+ per branchlet) stimulated leaf abscission in mistletoe. There were marked differences in sensitivity to ethylene among various types of holly.

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Yujie Yang, Donglin Zhang, Zhihui Li, Xiaoling Jin and Jinying Dong

glabra ( Sun et al., 2010 ), Ilex dumosa ( Luna et al., 2003 ), Ilex paraguariensis ( Sansberro et al., 1999 ), Ilex opaca ( Mattis et al., 1995 ), and Ilex aquifolium ( Majada et al., 2000 ). For plant breeders, clonal propagation usually does

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Sandra B. Wilson, Keona L. Muller, Judith A. Gersony and Brian T. Scully

on the mountain ( Breynia disticha ‘Nana’), japanese boxwood ( Buxus microphylla var. japonica ), and ‘Nellie R. Stevens’ holly ( Ilex aquifolium × cornuta ). Note: 1 ft = 0.3048 m. Despite the linear restriction of the garden, plant arrangement

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Youping Sun, Donglin Zhang and John Smagula

somatic embryos were obtained from immature Ilex aquifolium L. (English holly) zygotic embryos; however, the conversion rate of embryos into plants was low. In general, Ilex species have been propagated by shoot proliferation using nodal segments

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Natalia R. Dolce, Ricardo D. Medina and María T. González-Arnao

“English holly” ( Ilex aquifolium ), “Japanese holly” ( Ilex crenata ), and “American holly” ( Ilex opaca ), have long been symbolic of Christmas and have also been cultivated by nurserymen in Europe, Asia, and the United States for landscaping ( Hu, 1989