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Killian Melsen, Mark van de Wouw, and Ryan Contreras

directed modification of plant DNA, their use has been very limited in ornamental plant breeding for a few reasons. First, there is comparatively little knowledge of procedures for the transformation and regeneration of many ornamental species, and many

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Hsuan Chen, Jason D. Lattier, Kelly Vining, and Ryan N. Contreras

plant breeding. Like many other minor crops, the lack of a reference genome and the shortage of resources limit breeding strategies for woody ornamental plants. In the present research, heterozygosity and interspecific hybridization that are often

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Yonghong Guo, Matthew Kramer, and Margaret Pooler

Ornamental flowering cherry trees ( Prunus L. species) are popular plants for street, commercial, and residential landscapes. Grown primarily for their spring bloom, flowering cherries have been in the United States since the mid-1850s ( Faust and

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Kelly J. Vining, Ryan N. Contreras, Martin Ranik, and Steven H. Strauss

plants. Interspecific hybridization. Aside from selection and open pollination, the most common technique used in breeding of woody ornamental cultivars appears to be interspecific hybridization. The resulting hybrids are often sterile as a result of

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Viviane de Oliveira Souza, Margarete Magalhães Souza, Alex-Alan Furtado de Almeida, Joedson Pinto Barroso, Alexandre Pio Viana, and Cláusio Antônio Ferreira de Melo

characterized as a promising alternative to connect research activities in plant genetic resources and breeding programs ( Tombolato et al., 2004 ). Pre-breeding activities in ornamental species involve the collection of plant material; its introduction

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Hongmei Ma, Richard Olsen, Margaret Pooler, and Matthew Kramer

Ornamental flowering cherry trees ( Prunus species) are popular plants for street, commercial, and residential landscapes. Grown primarily for their spring bloom, flowering cherries have been in the United States since the mid-1850s ( Faust and

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Mohammad Majdi, Ghasem Karimzadeh, Mohammad A. Malboobi, Reza Omidbaigi, and Ghader Mirzaghaderi

according to Student's T-test. Discussion Polyploidy has played an important role in plant breeding as a valuable method for inducing variation and producing superior plants ( Lewis, 1980 ; Stanys et al., 2006 ). Tetraploid plants are

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Xuan Wu, Shuyin Liang, and David H. Byrne

organs ( De Vries and Dubois, 1996 ). For ornamental crops like roses, plant architecture is the key factor determining the appearance of the plant and its commercial value. In recent years, researchers have constructed models that describe the plant

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Zhitong Li and John M. Ruter

blooming vigor and longevity. Induction of polyploid genotypes is an effective means of producing enhanced characteristics and increased sterility. In breeding ornamental plants, polyploid induction has been widely applied to enlarge plant organs ( Caporali

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Junji Amano, Sachiko Kuwayama, Yoko Mizuta, Masaru Nakano, Toshinari Godo, and Hajime Okuno

three kinds of intergeneric hybrids examined in the present study may be valuable as materials for further breeding of colchicaceous ornamentals. Although all of them showed low or no pollen fertility, artificial chromosome doubling might allow these