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Regrowth of Buds and Flower Bud Formation in Kiwifruit as Affected by Early Defoliation
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 Title & Authors
Regrowth of Buds and Flower Bud Formation in Kiwifruit as Affected by Early Defoliation
Kwack, Yong-Bum; Kim, Hong Lim; Chae, Won-Byoung; Lee, Jae Han; Lee, Eung Ho; Kim, Jin Gook; Lee, Yong Bok;
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 Abstract
BACKGROUND: Kiwifruit, which was introduced to Korea in late 1970s, is a warm-temperate fruit tree, whose leaves are easily damaged by wind because of their large size. To produce high quality fruits, efficient windbreak is necessary to protect leaves until harvest. In Korea, typhoons from July onwards usually influence the production of kiwifruit. Damages from typhoons include low fruit quality in the current year and low flowering ratio the following year. This study was conducted to investigate the effect of early defoliation of kiwifruit vines from July to October on the regrowth of shoot axillary buds the current year and bud break and flowering the following year. METHODS AND RESULTS: Scions of kiwifruit cultivar 'Goldrush' were veneer grafted onto five-year-old Actinidia deliciosa rootstocks, planted in Wagner pots (13L) and grown in a rain shelter. Kiwifruit leaves in the proximity of leaf stalk were cut by lopping shears to simulate mechanical damage from typhoon since only leaf stalks were left when kiwifruit vines were damaged by typhoons. Kiwifruit vines were defoliated from July 15 to October 14 with one monthintervals and degrees of defoliation were 0, 25, 50, 75 and 100%. All experiments were conducted in the rain shelter and replicated at least five times. Defoliation in July 15 resulted in a high regrowth ratio of 20-40% regardless of degree of defoliation but that in August 16 showed only 5.8% of regrowth ratio in the no defoliation treatment; however, more than 25% of defoliation in August 16 showed 17-23% of regrowth ratio. In September 15, regrowth ratio decreased further to less than 10% in all treatments and no regrowth was observed in October 14. Percent bud break of all defoliation treatments were not significant in comparison to 64.7% in no defoliation except for 42.1% and 42.9% in 100% defoliation in July 15 and August 16, respectively. Floral shoot in the no defoliation treatment was 70.2% and defoliation of 50% or less resulted in the same or increased floral shoot ratio in July 15, August 16, and September 15; however, defoliation in October 14 showed no difference in all treatments. In flower number per floral shoot, 2-3 flowers appeared in no defoliation and only 1 flower was observed when the vines were defoliated more than 50% in July 15 and September 15. In October 14, contrary to the floral shoot ratio, flower number decreased with increased defoliation. CONCLUSION(S): Therefore, it is suggested that dormancy of 'Goldrush' axillary buds, was started in August and completed in October. The effect of defoliation on bud break of axillary buds the following year was insignificant, except for 100% defoliation in July 15 and August 16. From July 15 to September 15, floral bud ratio was significantly reduced when more than 50% of leaves were defoliated compared to no defoliation. Also, the number of flowers per flower-bearing shoot the following year decreased by less than 50% when compared to no defoliation, and this decrease was more prominent in September 15 than July 15 and August 16.
 Keywords
Bud break;Defoliation;Floral bud;Kiwifruit;
 Language
Korean
 Cited by
1.
Carbohydrate Reserves of Non-fruiting Young Kiwifruit Vines as Affected by Early Artificial Defoliation,;;;;;;

Horticulture, Environment, and Biotechnology : HEB, 2014. vol.55. 6, pp.462-470 crossref(new window)
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Regrowth of Axillary Buds the Current Season and Early Growth and Development the Following Year in Fruiting Young Kiwifruit as Affected by Early Defoliation, Korean Journal of Environmental Agriculture, 2015, 34, 4, 288  crossref(new windwow)
2.
Effect of artificial defoliation on cane regrowth and fruit development in ‘Jecy Gold’ kiwifruit, Horticulture, Environment, and Biotechnology, 2015, 56, 1, 22  crossref(new windwow)
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Carbohydrate reserves of non-fruiting young kiwifruit vines as affected by early artificial defoliation, Horticulture, Environment, and Biotechnology, 2014, 55, 6, 462  crossref(new windwow)
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Defoliation time influences vine regrowth, off-season flowering, and fruit quality in ‘Jecy Gold’ kiwifruit vines, Horticulture, Environment, and Biotechnology, 2016, 57, 3, 219  crossref(new windwow)
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