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  • Author or Editor: Hyo-Geun Park x
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It is very important to understand horticulture of other countries neighboured in Pan-Pacific region for the better regional cooperation. Korea lies at the eastern extremity of Asia, having a typical temperate weather with four distinctive seasons. Her annual precipitation ranges from 900 to 1,300 mm, two thirds of which is concentrated during 3 months from June to August. Korea is a small (98,000 km2) and critically overpopulated (43 millions) country. Out of total 2.2 million hectares of cultivated land, about 453,000 ha. are under horticultural crop; 316,500 ha. for vegetables, 133,000 ha. for fruit trees and 3,500 ha. for ornamental crops. Twenty eight percent of average farm income was earned from horticultural crops. Horticultural farming in Korea is small in size but very labor intensive. Figures on per capita consumption and international trade of major horticultural crops will be presented. National organization for research, education and extension, and the Korean Society for Horticultural Science will be introduced.

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Self-incompatibility (SI) in Brassicaceae vegetables prevents self-pollination by recognizing self-pollens and rejecting them at the stigmatic surfaces. The S-haplotypes of 47 hybrid radish cultivars that are commercially available in Korea were classified and identified using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Twelve kinds of S-haplotypes were identified from the cultivars: S 1 , S 8 , S 11 , S 17 , S 18 , S 30, and S 31 haplotypes in class-I S-haplotype and S 4 , S 5 , S 13 , S 21, and S 26 haplotypes in class-II S-haplotypes. Even though the class-II S-haplotypes are supposed to exhibit weak and/or leaky SI activity, the class-II S-haplotypes showed the same allele frequency of class-I S-haplotypes in 38 fully classified commercial cultivars. The SI activity was examined using the pollen tube germination test, flower pollination test, and the seed set ratio analysis. The pollen tube test showed low correlation (R 2 = 0.13) with the flower pollination test, a conventional method. The results of seed set ratio analysis varied from 0% to 159%, and thus could distinguish the weak and strong SI activity clearly and showed high correlation with the flower pollination test (R 2 = 0.69). The seed set ratios of the cultivars possessing the class-I/class-I, class-I/class-II, and class-II/class-II genotypes were 0.6%, 17.4%, and 38.1%, respectively. Among the eight class-II/class-II cultivars, three cultivars showed strong SI activity. The SI activity of the S 4 S 17 , S 5 S 8, and S 4 S 26 genotypes varied among cultivars, but the S 1 S 17 , S 5 S 17, and S 8 S 26 genotypes showed constant strong, intermediate, and strong activity, respectively, among the cultivars. Results indicate that the SI activity of Brassicaceae vegetables depends not only on the S-haplotypes, but also on the genetic background of cultivars.

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