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김홍림 ( Hong Lim Kim ),곽용범 ( Yong Bum Kwack ),한점화 ( Jeom Hwa Han ),오필경 ( Pill Kyung Oh ),채원병 ( Won Byoung Chae ),김성철 ( Seong Cheol Kim ),김목종 ( Mok Jong Kim ),김진국 ( Jin Gook Kim ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.4
BACKGROUND: Rabbiteye blueberry(Vaccinium ashei) is one of the most widely grown blueberry types in the world, together with Northern and Southern highbush blueberry(Vaccinium corymbosum). Rabbiteye blueberry have higher soil adaptability and fruit productivity but less cold tolerance to low temperature than highbush blueberry. The objective of this study is to investigate freezing tolerance of floral buds and establish a cultivation zone for rabbiteye blueberry cultivars. METHODS AND RESULTS: Bearing branches which have similar thickness and same number of floral buds were collected in the early January at the blueberry germplasm preservation plot located in Namhae Sub-station, National Institute of Horticultural and Herbal Science in Gyeongsangnamdo. Cold response of bearing branches were investigated by electrolyte leakage and freezing tolerance of floral buds were determined by ovary browning ratio of 50%(LT50). Cultivation zone was established based on mean annualextreme minimum temperature for 30 years, from1981 to2010. The electrolyte leakage of bearing branches in rabbiteye blueberry increased as temperature decreased and was lowest in ‘Brightwell’ but highest in ‘Bluegem’ when they were kept in -5°C. Besides, the electrolyte leakage increased in ‘Brightblue’, ‘Brightwell’, ‘Climax’, ‘Delite’, ‘Gardenblue’, ‘Southland’ and ‘Woodard’ in -20°C. Freezing tolerance(LT50) was lowest in ‘Bluegem’ and ‘Homebell’(-13.3°C), and highest in ‘Tifblue’(-25°C) among different rabbiteye blueberry cultivars. LT50 of ‘Southland’ was from-15.0 to-16.7°C, that of ‘Delite’, ‘Brightwell’,’ Austin’ and ‘Climax’ was -18.3°C, and that of ‘Bluebelle’, ‘Woodard’ and ‘Powderblue’ was -20°C. CONCLUSION: This study indicate that The hardiness zones of rabbiteye blueberry were classified into Six cultivation zones and cultivation zones of most cultivars were the south of Jeollanam-do and Gyeongdangnam-do, except for ‘Tifblue.’