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Science 5 October 1990:
Vol. 250. no. 4977, pp. 99 - 101
DOI: 10.1126/science.250.4977.99
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Articles

Developmentally Regulated Systemic Endopolyploid in Succulents with Small Genomes

E. Jay De Rocher 1, Kristi R. Harkins 2, David W. Galbraith 2, and Hans J. Bohnert 3

1 Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721
2 Department of Plant Sciences, University of Arizona, Tucscon, AZ 85721
3 Department of Biochemistry, University of Arizona, Tucson, AZ 85721

Nuclei from Mesembryanthemum crystallinum (ice plant) exhibit multiple levels of ploidy in every tissue as revealed by flow microfluorometric analysis of isolated nuclei stained with mithramycin. Multiples of the haploid nuclear genome complement (1C) corresponding to 2C, 4C, 8C, 16C, 32C, and 64C were observed. The distribution of nuclei among the different ploidy levels is tissue-specific and in leaves is characteristic of the stage of development. This type of genome organization has been identified in eight other succulent CAM (crassulacean acid metabolism) plant species with small genomes. Multiploidy may be a common property of this type of plant.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)