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Floral Bud Cold Hardiness and Cultural Safety Zone in Rabbiteye Blueberry Cultivars
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 Title & Authors
Floral Bud Cold Hardiness and Cultural Safety Zone in Rabbiteye Blueberry Cultivars
Kim, Hong-Lim; Kwack, Yong-Bum; Han, Jeom-Hwa; Oh, Pill-Kyung; Chae, Won-Byoung; Kim, Seong-Cheol; Kim, Mok-Jong; Kim, Jin-Gook;
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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%(). Cultivation zone was established based on mean annual extreme minimum temperature for 30 years, from 1981 to 2010. 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 . Besides, the electrolyte leakage increased in 'Brightblue', 'Brightwell', 'Climax', 'Delite', 'Gardenblue', 'Southland' and 'Woodard' in . Freezing tolerance() was lowest in 'Bluegem' and 'Homebell'(), and highest in 'Tifblue'() among different rabbiteye blueberry cultivars. of 'Southland' was from -15.0 to , that of 'Delite', 'Brightwell',' Austin' and 'Climax' was , and that of 'Bluebelle', 'Woodard' and 'Powderblue' was . 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.'
Cold hardiness;Cultural Safety Zone;Floral bud;Rabbiteye blueberry;
 Cited by
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