Karyological relationships among four species and subspecies of Sorex revealed by differential staining techniques.
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概要
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Chromosomes of <I>Sorex caecutiens shinto, S. c. saevus, S. unguiculatus</I> and <I>S. gracillimus</I> were compared in detail based on the G and C-banding patterns, paying attention to the structural variations of their No. 5 chromosomes. The first three had the diploid number of 42, and carried prominent satellites on the short arms of the pairs Nos. 19 and 20, but the last one (2n=36) only on the short arms of No.17. These satellites seemed to function as active NORs, being differentially stained by the one-step silver-staining method which was applied only to <I>S.c. shinto </I>in the present study. The <I>caecutiens</I> complex and <I>S. unguiculatus</I> were almost identical in their G-banding pattern as well as in their chromosome constitution, except for the No.5 chromosomes slightly differing from one another in the arm ratio and/or G-banding pattern. These chromosomal variations could be explained by two kinds of pericentric inversion rearrangements. <I>S. gracillimus</I> was highly homologous in the G-banding pattern with the <I>caecutiens</I> complex and<I> S. unguiculatus</I> in spite of a marked differentiation in the karyotype, sharing the identical pattern of G-bands with <I>S. unguiculatus</I> in almost 92% of its total chromosome length. The pair No. 5 of <I>S. gracillimus</I> was identical in the G-banding pattern with that of <I>S. unguiculatus</I>. The phylogenetic relationships of these four species and subspecies of <I>Sorex</I> were briefly discussed from a karyosystematic viewpoint.
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