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KMID : 0903619810220040265
Journal of the Korean Society for Horticultural Science
1981 Volume.22 No. 4 p.265 ~ p.280
Studies on Classification , Interaction and Activity of S - alleles in Chinese cabbage , Brassica campestris var . pekinensis



Abstract
Classification of 15 S-allele homozygous inbreds in Chinese cabbage, Brassica campestris var. pekinensis, was done and interactions and activities of S-alleles in each of 35 S-allele heterozygotes between nine different S-allele homozygotes were studied employing the techniques of the empty pollen grain counting on the stigma and the seed set analysis. Results obtained were as follows:
1. Ten different S-alleles were identified from the 15 homozygous inbreds and a specific S-allele number was arbitrarily given to each of them in a series from S₁ to S_(10).
2. Four different sexual organ × S-allele interaction types were found and the Type Ⅱ was the most frequent.
3. The dominance was more common in the pollen than in the stigma.
4. The dominance relationship was nun-linear more frequently in the stigma than in the pollen.
5. Five different activities of S-alleles in S-allele heterozygotes were shown in the pollen and in the stigma:
1) Complete dominance
2) Complete co-dominance
3) Dominance, but the activity of the dominant allele was weakened when crossed to the dominant S-allele homozygotes
4) Dominance, but the activity of the dominant allele was weakened when crossed to the recessive S-allele homozygotes
5) Mutual weakening
6. Dominant S-alleles showed higher activity than recessive S-alleles in general.
7. Alleles S₁ and S_(10) were dominant with high activity and alleles S_5 and S_5 were recessive with low activity and allele S₃ was highly active even though it was dominant in some heterozygotes and recessive in the others.
8. Considerations for breeding a three way or four way cross hybrid were discussed on the basis of results obtained.
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