Relationships between Sorghum bicolor (Poaceae) and its close relatives based on genomic in situ hybridization evidence

Authors : Qing LIU, H L, Jun WEN

Pages : 11-24

View : 19 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Sorghum bicolor insert ignore into journalissuearticles values(L.); Moench insert ignore into journalissuearticles values(sorghum); is a naturally well-established diploid species with 2n = 2x = 20. Here we provide evidence to identify the genomic relationships of S. bicolor and its extant relatives using genomic in situ hybridization. The genomic divergences between S. bicolor and its close relatives may be presented as: S. bicolor-S. x drummondii insert ignore into journalissuearticles values(Nees ex Steud.); Millsp. & Chase < S. bicolor-S. x almum Parodi < S. bicolor S. arundinaceum insert ignore into journalissuearticles values(Desv.); Stapf < S. bicolor-S. propinquum insert ignore into journalissuearticles values(Kunth); Hitchc. Sorghum arundinaceum probe signals showed spotted or painted patterns on the S. bicolor chromosomes, indicating that the degree of genomic divergence between S. bicolor and S. arundinaceum is distinct. It is reasonable to infer that S. bicolor might have diverged from S. arundinaceum in the early diversification history of the subgenus. The probe signal intensity of S. arundinaceum and S. propinquum is greater on the 17 chromosomes than on the remaining 23 chromosomes of S. halepense insert ignore into journalissuearticles values(L.); Pers., whereas S. bicolor and S. propinquum probes produced spotted or patchy signals on the 40 S. halepense chromosomes. Therefore, the degree of genomic divergence may be presented as: S. halepense-S. bicolor < S. halepense-S. arundinaceum < S. halepense-S. propinquum.
Keywords : Cereal crops, cultivated sorghum, genomic in situ hybridization, genomic relationship, Sorghum halepense