Dissection of rye B chromosomes and nondisjunction of the dissected segments in common wheat

R. Neil Jones, Atsushi Akahori, Munenori Wakimoto, Hishashi Tsujimoto, Quanwen Dou, Shuhei Nasuda, Katsumasa Niwa, Hiroyuki Tanaka, Takashi Ryu Endo

Research output: Contribution to journalArticlepeer-review

41 Citations (SciVal)


The rye B chromosome is a supernumerary chromosome that increases in number in its host by directed postmeiotic drive. Two types of rye B chromosomes that had been introduced into common wheat were dissected into separate segments by the gametocidal system to produce a number of rearranged B chromosomes, such as telosomes, terminal deletions and translocations with wheat chromosomes. A total of 13 dissected B chromosomes were isolated in common wheat, and were investigated for their nondisjunction properties. Rearranged B chromosomes, separated from their B-specific repetitive sequences on the distal part of the long arm, did not undergo nondisjunction, and neither did a translocated wheat chromosome carrying a long-arm distal segment containing the B-specific repetitive sequences. However, such rearranged B chromosomes, missing their B-specific sequences could undergo nondisjunction when they coexisted with the standard B chromosome or a wheat chromosome carrying the B-specific sequences. Deficiencies of the short arm did not completely abolish the nondisjunction properties of the B chromosome, but did reduce the frequency of nondisjunction. These results confirmed previous suggestions that the directed nondisjunction of the rye B chromosome is controlled by two elements, pericentromeric sticking sites and a trans-acting element carried at the distal region of the long arm of the B chromosome. Additionally, it is now shown that the distal region of the long arm of the B chromosome which provides this function is that which carries the B-specific repetitive sequences.
Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalGenes and Genetic Systems
Issue number1
Publication statusPublished - 25 Mar 2008


  • B chromosome
  • dissection
  • gametocidal chromosome
  • nondisjunction
  • rye


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