Differential genome evolution and speciation of Coix lacryma-jobi L. and Coix aquatica Roxb. hybrid guangxi revealed by repetitive sequence analysis and fine karyotyping.

Background: Coix, Sorghum and Zea are closely related plant genera in the subtribe Maydeae. Coix comprises 9-11 species with different ploidy levels (2n = 10, 20, 30, and 40). The exclusively cultivated C.