The Journal of Heredity 2000:91(3)
© 2000 The American Genetic Association 91:242-246
Novel flowering time variation in the resynthesized polyploid Brassica napus
1Program in Cell and Molecular Biology and 2Department of Agronomy, 1575 Linden Dr., University of Wisconsin, Madison, WI 53706, USA
Recent molecular data using resynthesized polyploids of Brassica napus established that genome changes can occur rapidly after polyploid formation. In this study we present data that de novo phenotypic variation for flowering time also occurs rapidly after polyploidization. Two initial polyploid plants were developed by reciprocal crosses of B. rapa and B. oleracea followed by chromosome doubling to establish two lineages, each of which was expected to be homozygous and homogeneous. Several sublineages of each lineage were advanced by self-pollination. The range in days to flower of the sixth generation plants was 39-75 and 43-64 for the two lineages. Analysis of seventh generation progeny indicated that the variation was heritable. Lines were selected and self-pollinated to the eighth generation and also testcrossed to a natural B. napus cultivar; the testcross plants were then self-pollinated. Differences in flowering time were also inherited in these advanced generations. Days to flower was significantly correlated with leaf number in each generation. The rapid evolution of new phenotypic variation, like that observed in this model system, may have contributed to the success and diversification of natural polyploid organisms.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  R. T. Gaeta, J. C. Pires, F. Iniguez-Luy, E. Leon, and T. C. Osborn Genomic Changes in Resynthesized Brassica napus and Their Effect on Gene Expression and Phenotype PLANT CELL, November 1, 2007; 19(11): 3403 - 3417. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. A. Udall and J. F. Wendel Polyploidy and Crop Improvement Crop Sci., November 1, 2006; 46(Supplement_1): S-3 - S-14. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T.-J. Yang, J. S. Kim, S.-J. Kwon, K.-B. Lim, B.-S. Choi, J.-A Kim, M. Jin, J. Y. Park, M.-H. Lim, H.-I. Kim, et al. Sequence-Level Analysis of the Diploidization Process in the Triplicated FLOWERING LOCUS C Region of Brassica rapa PLANT CELL, June 1, 2006; 18(6): 1339 - 1347. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. N. Lukens, J. C. Pires, E. Leon, R. Vogelzang, L. Oslach, and T. Osborn Patterns of Sequence Loss and Cytosine Methylation within a Population of Newly Resynthesized Brassica napus Allopolyploids Plant Physiology, January 1, 2006; 140(1): 336 - 348. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. L. Adams, R. Percifield, and J. F. Wendel Organ-Specific Silencing of Duplicated Genes in a Newly Synthesized Cotton Allotetraploid Genetics, December 1, 2004; 168(4): 2217 - 2226. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. MADLUNG and L. COMAI The Effect of Stress on Genome Regulation and Structure Ann. Bot., October 1, 2004; 94(4): 481 - 495. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. Joly, J. T. Rauscher, S. L. Sherman-Broyles, A. H. D. Brown, and J. J. Doyle Evolutionary Dynamics and Preferential Expression of Homeologous 18S-5.8S-26S Nuclear Ribosomal Genes in Natural and Artificial Glycine Allopolyploids Mol. Biol. Evol., July 1, 2004; 21(7): 1409 - 1421. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. E. Schranz and T. C. Osborn De novo variation in life-history traits and responses to growth conditions of resynthesized polyploid Brassica napus (Brassicaceae) Am. J. Botany, February 1, 2004; 91(2): 174 - 183. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Madlung, R. W. Masuelli, B. Watson, S. H. Reynolds, J. Davison, and L. Comai Remodeling of DNA Methylation and Phenotypic and Transcriptional Changes in Synthetic Arabidopsis Allotetraploids Plant Physiology, June 1, 2002; 129(2): 733 - 746. [Abstract] [Full Text] [PDF]
|
|