Extraordinary tertiary constrictions of Tripsacum dactyloides chromosomes: implications for karyotype evolution of polyploids driven by segmental chromosome losses.
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.
Koo
Dal-Hoe
DH
Department of Horticulture, University of Wisconsin, Madison, Wisconsin 53706, USA.
Jiang
Jiming
J
D005075:Biological Evolution; D032461:Chromosomes, Plant / Q000235:genetics* / Q000648:ultrastructure; D018744:DNA, Plant / Q000235:genetics; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008957:Models, Genetic; D006109:Poaceae / Q000145:classification / Q000235:genetics* / Q000648:ultrastructure; D011123:Polyploidy; D018626:Retroelements
D018744:DNA, Plant; D018626:Retroelements