Chromosome Numbers and Their Variation Patterns of Carex in the Ryukyu Islands
Chromosome Numbers and Their Variation Patterns of Carex in the Ryukyu Islands
复制标题
琉球群岛苔草染色体数目及其变异模式
DOI：
10.1508/cytologia.63.447
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发表时间：
1998
期刊：
影响因子：
1
通讯作者：
M. Yokota
中科院分区：
文献类型：
--
作者：
T. Ohkawa;T. Ohkawa;M. Yokota
报道了分布于琉球群岛的苔草属13种植物的染色体数目，其中包括12个新计数。在4个种中发现了种内非整倍体现象，并对种群内和种群间的染色体数目变异模式进行了分析。在3个种中，C. fulvo-rubescens、赤杨C. nemostachys和C. sakonis中发现了多种种内非整倍体细胞型。此外，在减数分裂过程中经常观察到染色体联合的显著紊乱，特别是在C。sakonis，因此这些物种的非整倍体细胞型之间的相容性是容易预测的。In C.另一方面，在所有调查的群体中没有发现群体内的染色体数目变异和减数分裂时稳定的染色体联合，这表明这些非整倍体细胞型至少在群体水平上已经分化。这两种类型的变异模式可能表明不同的非整倍体机制在苔草种群分化中起作用。
Chromosome numbers for 13 species, including 12 new counts, were reported for Carex distributed in the Ryukyu Islands. Intraspecific aneuploidy (sensu lato) was found in four species and the different types of chromosome number variation pattern within and among populations were recognized in this study. In three species, C. fulvo-rubescens, C. nemostachys and C. sakonis, several intraspecific aneuploid cytotypes were found in the same population. Additionally, notable disturbances of chromosome associations at meiosis were often observed, especially in C. sakonis, and therefore the compatibility among aneuploid cytotypes of these species was readily predictable. In C. sociata, on the other hand, no chromosome number variations within populations and stable chromosome associations at meiosis were found in all investigated populations, and suggesting that these aneuploid cytotypes have differentiated at least to the population level. These two types of variation pattern may indicate that the different aneuploidy mechanisms have operated in Carex population differentiation.