CMA Banding Patterns of Chromosomes in Major Citrus Species

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Fluorochrome staining with chromomycin A_3 (CMA) was used to characterize and compare the CMA banding patterns of chromosomes in 14 accessions of 12 species of major Citrus species. All accessions had 2n=18 chromosomes. These chromosomes were classified into seven types based on the number and position of CMA-positive bands: A: two telomeric and one proximal band, B: one telomeric and one proximal band, C: two telomeric bands, D: one telomeric band, E: without bands, F: one proximal band, and Dst: type D with a satellite chromosome. Each accession possessed two to six types of chromosomes and unique CMA banding patterns. The CMA banding patterns were 2B+8D+8E in C. medica, 1B+1C+8D+8E in C. limon, 2B+9D+7E in C. aurantifolia, 1A+1B+1C+7D+8E in C. aurantium, 2B+2C+7D+7E in C. sinensis, 3A+3C+4D+8E in C. maxima, 2A+3C+6D+7E in C. paradisi, 2B+2C+12D+2E in C. ichangensis, 2A+5C+8D+3E in C. latipes, 1B+11D+4E+2Dst in C. micrantha, 2B+1C+11D+3E+1F in C. macroptera, and 3B+1C+8D+3E+2F+1Dst in C. hystrix.
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