A New Self-Compatible Asian Pear: 'Sweet Cost'

作者：Shin I S^*; Hwang H S; Kang S S; Cho K H; Kim Y K; Kim S H; Kim H R; Lee H C

来源：Journal of the American Pomological Society, 2014, 68(3): 158-162.

• Pyrus pyrifolia
• pear breeding
• S-RNase gene
• artificial pollination
• labor-saving

'Sweet Cost', a new self-compatible Asian pear cultivar carrying the S-4(sm) (SM, stylar-part mutant) allele, was developed from a cross between 'Wonwhang' (S3S5), the main early-maturing pear cultivar with high fruit quality in Korea and the self-incompatible '92-18-31' ((S4S4sm)-S-sm) obtained from self-crossing of 'Osa-Nijisseiki' (S2S4sm), a self-compatible bud mutant that originated from self-incompatible 'Nijisseiki' (S2S4). The cross was made in 2000 at the National Institute of Horticultural and Herbal Science, Rural Development Administration in Korea. It was first selected as '2000-10-22' in 2006 for its attractive eating quality, good appearance and self-compatibility. After regional adaptability tests at 10 sites for 5 years from 2008 to 2012 as 'Wonkyo Na-61', it was selected and named in 2012. It bloomed 1 day earlier than 'Osa-Nijisseiki' and 1 day later than 'Wonwhang' in 2007 - 2012. It is medium in tree vigor and has an upright-spreading tree habit. Sweet Cost is classified as susceptible to pear scab (Venturia nashicola), similar to 'Osa-Nijisseiki'. Its S-genotype, determined using PCR-RFLP, is S3S4sm. Sweet Cost had a 49.5% fruiting rate by self-pollination. The average optimum harvest time of 'Sweet Cost' was 138 days after full bloom and it matured around one week earlier than 'Osa-Nijisseiki' and one week later than 'Wonwhang'. The fruit is roundish oblate in shape and yellowish brown in skin color. Average fruit weight was 464 g and soluble solids concentration was 12.2 degrees Brix. The flesh had abundant juice and negligible grit

• 出版日期2014-7