한국 초파리 집단의 염색체 역위와 환경과의 관계 = Chromosome Inversion - Environment Relationships in Korean Populations of Drosophila melanogaster

다국어 초록 (Multilingual Abstract)

Inversion polymorphisms from twenty two Korean populations of Drosophila melanogaster were analysed for relationships between inversion frequencies and environmental variables. From screening gametes in male for allele frequency and fertilized eggs inseminated in nature for heterozygosity, a total of thirty three polymorphic inversions were found and identified to be paracentric only. Eight were common and cosmopolitan, and twenty five were new, rare and generally endemic. And three complex inversions were detected, two overlapping inversions and a including inversion. For inversion-environment relationships, allele frequency, heterozygosity of six cosmopolitan inversions and a number of variables selected from possible environmental factors were examined by the methods of multivariate data analyses. Significant inversion-environment associations were found at several inversions, especially at In(2L)t and In(2R)NS, in both allele frequency and heterozygosity. For north-south cline with the frequencies of the six commonest inversions, twenty one populations, except for the Ulleungdo(5), were categorized into three longitudinal groups: E-line group (along the east seaside), C-line (lining up in central region) and W-line (locating toward western area near the yellow sea). Significant geographic cline was positively or negatively sorted by only one or a few types of inversion in each of the three geographic groups. The close associations were particularly evident with respect to weather conditions and the patterns of inversion variations. Therefore, it is suggested that natural selection plays role as a major factor to determine the genetic patterns of geographic populations.