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

Changes in cellular parameters that are brought about by variations in genome size are referred to as nucleotypic effects ( Bennett, 1972 ; Rayburn, 1993a ). Nucleotypic effects have been observed in various plant species ( Bennett, 1976 ; Chung

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Josue Ortega-Ortega, Francisco Arturo Ramírez-Ortega, Roberto Ruiz-Medrano and Beatriz Xoconostle-Cázares

the domestication and evolution of this genus through analysis of genome sequence and nuclear genome size, among other approaches ( Barre et al., 1996 ; Herrera et al., 2002 ). Genome size is incongruent with the ploidy level and number of basic

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Todd J. Rounsaville and Thomas G. Ranney

, 2 n = 4 x = 56, including B. buxifolia Lam., B. heterophylla Juss. ex Poir., and B. turcomanica Kar. ( Bottini et al., 2000 ; Dermen, 1931 ). Independent of variations in ploidy level, information on base genome size (base DNA content) can

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Ryan N. Contreras and John M. Ruter

stems for the florist's trade ( Bir and Conner, 1997 ; Greer and Dole, 2009 ). In recent years, there has been an increase in the number of genome size estimates available for both plants and animals ( Bennett and Leitch, 2005 ; Gregory, 2005 ). For

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Dominic A. Gillooly and Thomas G. Ranney

sampling within and among species and can provide accurate estimates of ploidy, particularly for Ericaceous plants ( Jones et al., 2007 ). The objective of this study was to survey genome sizes and ploidy levels of a broad range of species, hybrids, and

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Thomas G. Ranney, Connor F. Ryan, Lauren E. Deans and Nathan P. Lynch

traits of early angiosperms ( Morris et al., 2007 ; Soltis et al., 2009 ). Chromosome numbers and nuclear genome sizes vary widely among angiosperms. The original base chromosome number of the angiosperm linage was most likely somewhere between x = 6

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William G. Hembree, Thomas G. Ranney, Brian E. Jackson and Mark Weathington

have not been analyzed for ploidy or genome size. Improved knowledge of chromosome numbers and ploidy levels of key species and cultivars would be a valuable resource for further breeding and improvement of Camellia . Analyses of other closely related

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Alan T. Whittemore and Zheng-Lian Xia

additional trees with known chromosome numbers will give us a firmer understanding of variation in genome size. In addition, a broad survey of nuclear DNA content in Ulmus and related genera using flow cytometry could provide more information on the

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Sumin Kim, Mengqiao Han and A. Lane Rayburn

size variation was not observed by the previous study ( Ladizinsky and Adler, 1976 ). This leads to speculation that there may be errors in reporting genome size variation in the genus Cicer. Giving credence to this hypothesis is that two different 2C

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J. Kevin Parris, Thomas G. Ranney, Halina T. Knap and W. Vance Baird

, traditional cytology based on light microscopic examination is a difficult and time-consuming process. Flow cytometry has proved to be an efficient means of estimating genome size and associated ploidy level ( Doležel et al., 2007 ; Jones et al., 2007