VARIATION AND EVOLUTION IN TRILLIUM
III. THE BREEDING SYSTEM OF TRILLIUM KAMTSCHATICUM PALL. IN SOME NATURAL POPULATIONS
1956 Volume 31 Issue 3 Pages 65-81
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1956 Volume 31 Issue 3 Pages 65-81
The problem of breeding systems, which bears fundamental importance in the course of study on the dynamics of genetical changes among the populations, has been investigated by many workers since the beginning of this century. The Hardy-Weinberg law established in the year 1908 is the most fundamental principle in this problem. It has an important meaning in respect to organic evolution as was pointed out by Dobzhansky (1951, pp. 53). In this paper, the breeding system of T. kamtschaticum, is studied applying this law with reference to the types of differential segments of chromosomes in several populations found in northern Japan.
Though there were many kinds of types in each chromosome pair as shown in Appendix Tables and Table 2, they could be classified into two groups: A and nonA. Then the Hardy-Weinberg law was applied regarding A and nonA as a pair of alleles. Based on the results of χ2-test for the Hardy-Weinberg law, it was concluded that the breeding of T. kamtschaticum in almost all the natural populations was random.
The values of χ2-test in Sr and Srr-N, however, showed significant deviation from the Hardy-Weinberg law. These deviations were tentatively attributed, in Sr, to predominance of inbreeding, and in Srr-N, to the formation of a subgrouping in this population due to some ecological conditions. Acknowlegement The writer wishes to express his thanks to Mr. Masataka Kurabayashi for many valuable guidances and suggestions throughout this study, to Mr. Motoo Kimura for helpful and kind advises with statistical method and to Professor Hajime Matsuura and Professor Tsutomu Haga for several suggestions.
