Abstract
Primary and secondary trisomics as well as telotrisomics have been well characterized in rice morphologically and the transmission rates of extra chromosomes have been investigated. Primary trisomics have been utilized for associating genes and linkage groups with respective chromosomes. Secondary trisomics and telotrisomics were employed to associate genes with respective chromosome arms. As a result the positions of centromeres on the linkage maps could be pinpointed. Monosomic alien addition lines (MAALs) have a complete chromosome complement of Oryza sativa and a single chromosome of a wild species in genus Oryza. All the MAALs of O. officinalis and O. punctata have been produced. A partial set of MAALs of 5 other wild species of rice have also been produced. These aneuploid stocks of rice are useful not only for genetic study such as gene dosage analysis but also for rice breeding.
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