Abstract
Chromosome numbers of 114 individuals from twelve populations ofSedum aizoon L. var.aizoon (Crassulaceae) are reported. They include 37 different chromosome numbers ranging from 2n=71 to 124. Although the chromosome number variation has been found in all populations examined, no correlation with geographical distribution could not be found. Various kinds of meiotic irregularities, i.e., multivalents, univalents, chromosome lagging, and polysporous “tetrad” formation have been found. These irregularities lead to the formation of gametes with various chromosome numbers. All aneuploid plants set seeds and seem to reproduce sexually. The extensive aneuploidy in var.aizoon seems to be caused by the unequal chromosome segregation in meiosis and the subsequent fertilization of gametes with various chromosome numbers.
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Amano, M., Ohba, H. Biosystematic study ofSedum L. subgenusAizoon (Crassulaceae). Bot Mag Tokyo 105, 431–441 (1992). https://doi.org/10.1007/BF02497658
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DOI: https://doi.org/10.1007/BF02497658