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Cecil Pounders, Tim Rinehart, Ned Edwards and Patricia Knight

was resistant to powdery mildew, served as the impetus for introgression of L. fauriei into the U.S. National Arboretum breeding program as a source of powdery mildew resistance. No detrimental effects from this interspecific cross on fertility were

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Wenhao Dai, Yuanjie Su, Hongxia Wang and Ceilo Castillo

may impede interspecific crosses; therefore, elite traits cannot be efficiently integrated into newly developed plants ( Rose et al., 2000 ; Tobutt, 1993 ). Transgenic plants have been obtained in many woody species ( Petri and Burgos, 2005 ; Poupin

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David J. Norman, Qi Huang, Jeanne M.F. Yuen, Arianna Mangravita-Novo and Drew Byrne

of interspecific crosses. Fig. 1. Genetic comparison of 61 cultivars of geraniums using amplified fragment length polymorphism. Similarity coefficients displayed across top axis. Cluster A contains regal and scented cultivars. Cluster B

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Masanori Honjo, Sono Kataoka, Susumu Yui, Masami Morishita, Miyuki Kunihisa, Takayoshi Yano, Megumi Hamano and Hiromichi Yamazaki

is an example of hybrid variegation that arises after interspecific crosses in plants with biparental plastid inheritance, resulting in a nonharmonious interaction between the plastids of one parent and the hybrid genome after the “sorting out” of

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David O. Okeyo, Jack D. Fry, Dale J. Bremer, Ambika Chandra, Dennis Genovesi and Milton C. Engelke

quality ( Fry et al., 2008 ). These progeny were the result of interspecific crosses made at Texas AgriLife Research-Dallas Urban Solutions Center, most of which involved one parent from Z. japonica and one from a Z. matrella cultivar or ‘Emerald

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Neil O. Anderson, Steven Poppe, Peter D. Ascher, Esther Gesick, Shengrui Yao, David Wildung, Patricia Johnson, Vincent Fritz, James Hebel, Lee Klossner, Neal Eash, Barbara E. Liedl and Judith Reith-Rozelle

.S. Plant Patent 15,027; Canadian Plant Breeders’ Rights Certificate No. 2951) is a descendant of the 1989 open-pollinated interspecific cross No. 90-287 ( Anderson et al., 2008 ) between two allohexaploid (2 n = 6 x = 54) species, C. weyrichii (Maxim

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Richard L. Bell

controlling the trait. Pasqualini et al. (2006 ) did not find high levels of resistance in many selections from some interspecific crosses involving NY 10353 and NY 10355 and observed that transmission of resistance depended on the parental combination. They

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Shujun Zhou, Guixue Zhou and Kehu Li

for the evolution of apomixis Phil. Trans. R. Soc. B 333 1 13 Johnston, S.A. den Nijs, T.M. Peloquin, S.J. Hanneman, R.E. Jr 1980 The significance of genic balance to endosperm development in interspecific crosses Theor. Appl. Genet. 57 5 9 Johnston, S

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Ryan N. Contreras and John M. Ruter

combination of availability of material and horticultural interest. Over 500 interspecific crosses were made in 2008 in attempts to cross C. americana with six species, including C. acuminata , C. cathayana , C. formosana , C. japonica ‘Leucocarpa’, C

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Neil O. Anderson, Vincent Fritz, Charlie Rohwer, Steven Poppe, Barbara E. Liedl, Shengrui Yao, Patricia Johnson, Judith Reith-Rozelle, Lee Klossner and Neal Eash

’ ( Fig. 1 ) has an intricate series of outcrosses, backcrosses to descendants of the parental species, and self-pollinations (inbreeding) beginning in 1989 after the original interspecific cross between two allohexaploid (2 n = 6 x = 54) species, C