A SEX DETERMINING MECHANISM IN THE CLOSTERIUM EHRENBERGII (CHLOROPHYTA) SPECIES COMPLEX 1
A SEX DETERMINING MECHANISM IN THE CLOSTERIUM EHRENBERGII (CHLOROPHYTA) SPECIES COMPLEX 1
复制标题
新月藻（绿藻）物种复合体 1 中的性别决定机制
DOI：
10.1111/j.0022-3646.1990.00195.x
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发表时间：
1990
影响因子：
2.9
通讯作者：
T. Ichimura
中科院分区：
文献类型：
--
作者：
F. Kasai;T. Ichimura
纯合mt−/mt−二倍体克隆的新月藻ehrenberten-Menegh。ex Ralfs种复合体，分析了野生型mt+单倍体和mt-/mt-纯合二倍体“三倍体”接合孢子F1代的交配型分离比例。正、负个体数之比为1：4.8，异交配型对与负交配型对之比为1：2.1。结果清楚地表明，mt−对mt+是显性的，这些接合孢子中的交配型遗传遵循三倍体样模式。我们假设两种交配类型由一个遗传因素（mt−等位基因显性）决定的有效性也在B1后代分析中得到了证实。结果表明，这种性别决定机制在C。ehrenbergii物种复合体，其中几个生物物种通过多倍化进化。
Homozygous mt−/mt− diploid clones of the Closterium ehrenbergii Menegh. ex Ralfs species complex were obtained by hypertonic treatment from minus vegetative cells, and mating type segregation ratios in the F1 progeny of “triploid” zygospores between wild type mt+ haploid and mt−/mt− homozygous diploui were analyzed. The ratio of plus to minus individuals was 1:4.8, and the ratio of the pairs of opposite mating types to those of minus mating type was 1:2.1. The results clearly show that mt− is dominant to mt+ and that the mating type inheritance in these zygospores follows the triploid‐like pattern. The validity of our assumption that the two mating types are determined by one genetic factor (mt− allele dominant) was confirmed in B1 progeny analyses as well. The results suggest that this sex determining mechanism is working effectively in the C. ehrenbergii species complex, in which several biological species have evolved through polyploidization.