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Ryan N. Contreras, Ron Determann, and Mara Friddle

green. Our hypothesis was that a difference in ploidy level among cultivars is related to the variation in winter color and that cultivars that remain greener during winter were tetraploids. The current study was conducted to determine the ploidy level

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Thomas G. Ranney, Tracy H. Thomasson, Kristin Neill, Nathan P. Lynch, and Mark Weathington

of ploidy is important for plant breeders, as it can influence crossability, fertility of progeny, segregation of traits, and gene expression. There is limited information on the cytogenetics of aucuba. Some species, including A. chinensis

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S. Brooks Parrish, Renjuan Qian, and Zhanao Deng

have focused most attention on L. camara. Patermann (1938) was the first to report a chromosome number for the Lantana genus, identifying L. trifolia as 2 n = 48. Since then, a range of ploidy levels have been identified in L. camara , from 2

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Yan He, Lulu Yang, Yanjun Zhang, and Qiong Liang

information available for Bletilla , we carried out a study on the ploidy level, chromosome number, and genome size. Our research aims to provide important information for the further reservation and development of the important medicinal resource of

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David C. Zlesak, Vance M. Whitaker, Steve George, and Stan C. Hokanson

rose ploidy level, this would help breeders develop disease-resistant cultivars more efficiently because of a greater likelihood of reproductive success. Preferential crossability and fertility as a consequence of ploidy level has been well documented

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

name. The most recent study of ploidy differences within H. macrophylla was reported by Zonneveld (2004) . Propidium iodide-stained nuclei of 25 H. macrophylla ssp. macrophylla and 18 H. macrophylla ssp. serrata taxa were examined using

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Karen R. Harris-Shultz, Susana Milla-Lewis, Aaron J. Patton, Kevin Kenworthy, Ambika Chandra, F. Clint Waltz, George L. Hodnett, and David M. Stelly

could become contaminated by germinating seedlings if zoysiagrass inflorescences were allowed to mature. The objective of this study was to determine the genetic variability and ploidy variation within vegetatively propagated zoysiagrass cultivars

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Renjuan Qian, S. Brooks Parrish, Sandra B. Wilson, Gary W. Knox, and Zhanao Deng

‘Mario Pollsa’ porterweed ( Stachytarpheta spp.). Through controlled crosses, the potential for nettleleaf porterweed to hybridize with jamaican porterweed was realized. However, there is a lack of information, such as ploidy level and pollen

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Timothy A. Rinehart, Brian E. Scheffler, and Sandra M. Reed

have been identified (Glyn Church, personal communication). The objectives of this study were to examine ploidy levels of Dichroa selections, evaluate the genetic diversity within the available Dichroa germplasm, determine if naturally occurring

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Mohammad Sadat Hosseini Grouh, Kourosh Vahdati, Mahmoud Lotfi, Darab Hassani, and Nejat Pirvali Biranvand

acid. Flow cytometer analysis. Flow cytometry was used for determination of the ploidy level of samples prepared from leaves of the haploid and diploid (control) in vitro plants. Nuclei were released from 0.5 cm 2 of leaf tissue by chopping with a