Molecular cytological study for ASGR-carrier chromosome in aposporous plant

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Apomixis is a phenomenon that produces clonal progeny through seed reproduction. Apospory is a mode of apomixis that is considered to be controlled by the Apospory-Specific Genomic Region (ASGR)-carrier chromosome. The ASGR-carrier chromosome was discovered in aposporous Pennisetum and Cenchrus species, but a portion of it (the ASGR) is absent from related sexual species. The ASGR-carrier chromosome was also discovered in Guineagrass (Panicum maximum).In this study, I aimed to analyze the genomic position of three expressed sequence tags (ESTs) reported as candidate genes for apospory and to compare the ASGR between P. maximum and Pennisetum species. The results indicated that the ESTs were not mapped in the ASGR, therefore, the ESTs were probably not responsible genes for apospory, and that the ASGR was conserved between P. maximum and Pennisetum species, supporting the hypothesis "Apospory was spread by transmission of the ASGR.".