Extraordinary tertiary constrictions of Tripsacum dactyloides chromosomes: implications for karyotype evolution of polyploids driven by segmental chromosome losses |
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Authors: | Koo Dal-Hoe Jiang Jiming |
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Institution: | Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706, USA. |
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Abstract: | Tripsacum dactyloides (2n = 2x = 36) is an ancient tetraploid species. Here we report that T. dactyloides chromosomes contain an extraordinary tertiary constriction, which causes a radical and distant separation of a terminal segment from the chromosome. The relationships between extraordinary tertiary constriction and segmental chromosome loss as well as karyotype evolution of polyploid species are discussed. |
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