Studies on self- and cross-imcompatibility in the artificial autotetraploids of Brassica pekinensis:I. Results of the primary and the secondary crosses based on the four different strains with perfectly homozygous genotype for oppositional genes

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Relations between the behaviour or the function of the oppositional genes and the fertility in the artificial autotetraploids of Chinese cabbage (Brassica pekinensis Rupr.) were studied. In a diploid variety "Kanazawa-Hakusai". four homozygous strains, S1S1, S2S2, S3S3 and S4S4, were analysed by the crossing experiments, and their correspondent autotetraploids were induced. The results of the selfing and the primary and the secondary crosses were as follows:1. The plants with S1S1S1S1, S2S2S2S2, S3S3S3S3 and S4S4S4S4 showed a self-and cross-incompatibility in the intra-group crossings among individuals with the same genotype (Table 1).2. All the possible cross combinations with SaSaSaSa×SbSbSbSb types showed compatibility (Table 2).3. Among six plants with SaSaSbSb type four with S1S1S2S2, S1S1S3S3, S1S1S4S4 and S3S3S4S4, showed a self- and cross-incompatibility in the intra-group crossings among the individuals with the same genotype, while the remaining two with S2S2S3S3 and S2S2S4S4 were self incompatible (Table 3).4. In nine cross combinations with SaSaSbSb×SaSaSaSa type cross incompatibility were recognized, while six with SaSaSaSa×SaSaSbSb type showed cross-compatibility (Table 4).5. Nine combinations with SaSaSbSb×ScScScSc type were always cross-compatible (Table 5).6. Fifteen combinations with SaSaSbSb×SaSaScSc type (Table 6) and five with SaSaSbSb×ScScSdSd type (Table 7) were olso compatible.
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