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Liuhui Yang, Jianjun Zhang, Jaime A. Teixeira da Silva and Xiaonan Yu

non-Chinese cultivars of herbaceous peony is reported. The characteristics and variation in chromosome number and karyotype have also been analyzed. Cytological data of these cultivars will allow better guidance of future breeding work. Materials and

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Jeffrey Adelberg, B.B. Rhodes and Halina Skorupska

Watermelon (Citrullus Lanatus (Thunb.) Matsum and Nakai) and muskmelon (Cucumis melo) were regenerated from immature cotyledons cultured on MS medium containing 10 μM BA. Small population of watermelon and muskmelon regenerants contained tetraploids as variants. The tetraploid individuals were recognized by morphological features including enlarged leaves, tendrils, male flowers, and variable pollen grains. After self-pollination, seed lots reflected differences in size expected from tetraploid parents.. Cytological data from root tips of R1 populations will be presented.

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Chao Yu, Le Luo, Hui-tang Pan, Yun-ji Sui, Run-hua Guo, Jin-yao Wang and Qi-xiang Zhang

and Robertson, 2003 ) and related cytological data. There is much interest worldwide in the wild Rosa species from China, because they contributed much of the foundation of modern cultivated roses. Wild Rosa species with important traits, such as

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A. Lane Rayburn, Mosbah M. Kushad and Wanisari Wannarat

report documenting about a 1% variation between different wheat cultivars ( Wetzel et al., 1999 ). This small variation was supported by the cytological data of Wetzel and Rayburn (2000) . Pumpkin is a somewhat arbitrary term usually referring to “any

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Keri D. Jones, Sandra M. Reed and Timothy A. Rinehart

flow cytometry. All of the H. macrophylla ssp. serrata and 16 of the H. macrophylla ssp. macrophylla plants were found to be diploids. The remaining H. macrophylla ssp. macrophylla plants were identified as triploids. Although cytological