A comparison of chromosome characters in three species of Thymus (Lamiaceae) collected in Russia and Mongolian Altai
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Characters of the resting, the mitotic prophase and metaphase chromosomes in three species of <I>Thymus</I> were studied. The species studied had commonly resting chromosomes of the complex chromocenter type and mitotic prophase chromosomes of the proximal type. <I>Thymus mongolicus</I> showed the chromosome numbers of 2n=26 and 27 and <I>T. przewalskii</I> and <I>T. roseus</I> showed the chromosome number of 2n=26. The chromosome number of 2n=26 for <I>T. przewalskii</I> and that of 2n=27 for <I>T. mongolicus</I> were reported here for the first time and that of 2n=26 for <I>T. roseus</I> and <I>T. mongilicus</I> verified the previous reports. The chromosome number of 2n=27 for <I>T. mongolicus</I> seemed to have one B-chromosome as 2n=26+1B with respect to the existence of a peculiar heteropycnotic body at resting stage and high pollen stainability. Three species were commonly placed in the diploid level if the basic chromosome numbers of x=13 was accepted. Their karyotypes at mitotic metaphase were quite similar to each other regarding chromosome sizes, chromosome types according to the centromeric position and mono-modality of chromosome lengths from the longest to the shortest chromosomes except for satellite sizes.
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国際染色体植物学会 | 論文
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