Karyotypic Studies of Two Thymus Species
Karyotypic Studies of Two Thymus Species
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两种胸腺物种的核型研究
DOI：
10.1508/cytologia.67.343
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发表时间：
2002
期刊：
影响因子：
1
通讯作者：
F. Sefidkon
中科院分区：
文献类型：
--
作者：
S. Mehrpur;H. Mirzaie;A. Majd;F. Sefidkon
百里香（thyymus kotschyanus）和短毛百里香（thyymus pubescence）是两种分布广泛的百里香，生长在伊朗全国各地。本研究对在自然生境中采集的4个野田鼠种群和3个短毛田鼠种群的核型进行了分析。即种内存在2个倍性水平，染色体以m型为主，其余为sm型。因此，对2个倍性水平组成2个数据组。采用完全随机设计模型对数据组进行因子方差分析，以每组的总体和染色体为2个因素。估计了总形态百分比（TF%）和其他几个参数来比较群体和物种的核型。方差分析显示，二倍体和四倍体群体及其染色体在核型记录上存在显著差异。不同二倍体群体的染色体大小在0.92 ~ 2.06 μm之间变化。单株二倍体群体的染色体长度变化范围为1.05 ~ 2.32 μm。在2个四倍体群体中，短柔毛t的染色体大小在0.83 ~ 1.88 μm之间变化。四倍体种群的染色体长度变化范围为0.91 ~ 1.66 μm。事实上，这两个物种的所有染色体都很小。平均而言，四倍体群体的染色体比二倍体群体的染色体要小。
Thymus kotschyanus and Thymus pubescence are 2 vast spreaded species of Thyme, growing all around the country in Iran. This study has characterized karyotypes of 4 populations of T. kotschyanus and 3 populations of T. pubescence all collected from their natural habitats. In other words, 2 ploidy levels were observed within the species and their chromosomes were mainly of m and the rest of sm type. Therefore, 2 data groups were formed for the 2 ploidy levels. Factorial analysis of variance was carried out on the data groups in completely randomized design model, regarding the populations and chromosomes of each group as the 2 factors. Total form percentage (TF%), and several other parameters were estimated to compare the karyotypes of the populations and the species.Analysis of variance presented significant differences between the diploid and tetraploid populations and their chromosomes, based on the data recorded on the karyotypes of the populations. Size of the chromosomes among the diploid populations of T. kotschyanus species varied from 0.92 to 2.06 μm. Chromosome length of the only diploid population of T. pubescence species varied from 1.05 to 2.32 μm. Within the 2 tetraploid populations of T. pubescence species the size of the chromosomes varied from 0.83 to 1.88 μm. Chromosome length of the only tetraploid population of T. kotschyanus species varied from 0.91 to 1.66 μm. In fact all of the chromosomes of the 2 species are very small in size. In average the chromosomes of tetraploid populations are smaller than the chromosomes of diploid populations.