Journal
MOLECULAR GENETICS AND GENOMICS
Volume 290, Issue 2, Pages 431-441Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00438-014-0926-1
Keywords
B-Chromosome; RAPD; SCAR; B-A translocation; Maize; Transcription
Funding
- National Sciences Council Grant of Taiwan [NSC99-2311-B-005-003-MY3, NSC102-2311-B-005-001-]
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Understanding the molecular organization of the maize B-chromosome is hindered by its high homology with A-chromosomes. Recently, various approaches have been employed to overcome this hindrance, and several B-chromosome-specific sequences have been identified. Here, we cloned and characterized four previously published B-chromosome-specific RAPD fragments in detail. The results of sequence analysis, Southern hybridization and fluorescence in situ hybridization revealed that the four RAPD fragments are repetitive and present on both the B- and A-chromosomes, which supports an A-chromosome origin of the B-chromosome. We further developed four sequence-characterized amplified region (SCAR) markers derived from the four B-chromosome-specific RAPDs. These markers amplified PCR products exclusively in plants with B-chromosomes and were further mapped to definite distal heterochromatic regions of the B-chromosome by 15 B-A translocations. Furthermore, reverse transcriptase-PCR revealed that two of the four B-chromosome-specific RAPD fragments are transcriptionally active. These results demonstrate the feasibility of using B-chromosome-specific RAPD sequences to generate SCAR markers specific to the B-chromosome and might apply to other sequences of the maize B-chromosome.
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